import java.util.Scanner;
public class Main {
public static void main(String[] args){
Scanner sc=new Scanner(System.in);
int i;
int x=sc.nextInt();
for(i=1;i<=x;i++){
if(i%5==0){
System.out.println(i);
}
else if(i!=x)
System.out.print(i+" ");
else
System.out.print(i);
}
}}
7-2 整数的因子
import java.util.Scanner;
public class Main{
public static void main(String[] args){
Scanner sc=new Scanner(System.in);
int n=sc.nextInt();
for(int i=1;i
7-2 整数的因子
import java.util.Scanner;
public class Main{
public static void main(String[] args){
Scanner sc=new Scanner(System.in);
int n=sc.nextInt();
for(int i=1;i
7-3 判断素数
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int n=scanner.nextInt();
int m=0;
if(n==1) {
System.out.println("no");
return ;
}
for(int i=2;i
7-1 前n项的和1
import java.util.Scanner;
//
public class Main {
public static void main(String[] args){
Scanner sc=new Scanner(System.in);
int i,sum=1;
int x=sc.nextInt();
for(i=1;i
7-2 前n项的和2 (10 分)
import java.text.NumberFormat;
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
NumberFormat nf=NumberFormat.getNumberInstance();
nf.setMaximumFractionDigits(2);
int n=sc.nextInt();
double sum=1.0;
int i;
for(i=1;i
7-1 买鸡问题
import java.util.Scanner;
public class Main{
public static void main(String[] args){
Scanner sc=new Scanner(System.in);
int n=sc.nextInt();
int m=sc.nextInt();
int count=0;
for(int i=0;i<=n/5;i++)
for(int j=0;j<=n/3;j++)
for(int k=0;k<=(n*3);k++) {
if(k%3==0&&(i+j+k==m)&&(5*i+3*j+k/3==n)){
System.out.println(i+","+j+","+k);
count++;
}
}
System.out.print(count);
}
}
7-2 数字黑洞123
import java.util.*;
public class Main{
public static void main(String[] args){
Scanner xn=new Scanner(System.in);
int a=xn.nextInt();
int b=0,c=0,d=0,f=0,h=0,e=0,g=1;
while(g!=0){
b=a;
e=0;
d=0;
f=0;
while(b!=0){
c=b%10;
b=b/10;
if(c%2==0)
d++;
else
e++;
f++;
}
h++;
if(d==1&&e==2&&f==3)
g=0;
a=(d*100)+(e*10)+f;
}
System.out.print(h);
}
}
7-3 添加乘号
import java.util.Scanner;
public class Main {
public static void main(String args[]){
Scanner sc=new Scanner(System.in);
int n = sc.nextInt();
int m = sc.nextInt();
int x = 1;
int y=3;
int index = 0;
for(int k = 1; k<=n; k++){
for(int j = 1; j<=n; j++){
int sum=0;
for(int i=1; i<=n; i++){
if(i==x||i==y){
sum = sum+(i+1) * i;
i++;
}else{
sum = sum +i;
}
}
if(sum==m){
System.out.println(x+","+y);
index++;
}
y++;
}
x++;
y = x+2;
}
if(index==0){
System.out.println("0");
}
}
7-1猴子吃桃
public class Main {
public static void main(String[] args) {
Scanner scanner=new Scanner(System.in);
int y=scanner.nextInt();
int i=0;
while(i<9){
y=(y+1)*2;
i++;
}
System.out.println(y);
}
}
7-2 斐波那契数列第n项
public class Main {
public static void main(String[] args) {
Scanner scanner=new Scanner(System.in);
int n=scanner.nextInt();
int f1,f2,f3,i,t=0;
f1=f2=1;
if(n==1||n==2){
System.out.print("1");
}
else{
for(i=2;i
7-3 皮球反d高度
public class Main{
public static void main(String[] args){
Scanner xn=new Scanner(System.in);
double a=xn.nextDouble();
double b=a;
for(int i=0;i<9;i++)
{
a=a/2;
b+=a*2;
}
System.out.printf("%.2f",b);
System.out.println();
System.out.printf("%.2f",a/2);
}
}
7-1 数组创建
public class 数组 {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int n=scanner.nextInt();
int[] a=new int[n];
for(int i = 0;i
7-2 数据逆序输出
import java.util.Scanner;
public class Main {
public static void main(String[] args){
Scanner sc=new Scanner(System.in);
int n=sc.nextInt();
int[] a=new int[n];
for(int i=0;i=0;j--) {
System.out.print(a[j]+" ");
}
}
}
7-3 判断是否有重复数据
import java.util.HashSet;
import java.util.Scanner;
import java.util.Set;
public class Main {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int len=scanner.nextInt();
scanner.nextLine();
String str = scanner.nextLine();
String[] strs = str.split(" ");
Set set = new HashSet();
for (int i=0; i
7-1 数组插入元素
public class Main {
public static void main(String[] args) {
int i, j, t, k;
Scanner read = new Scanner(System.in);
int n = read.nextInt();
int[] a;
int[] b;
a = new int[n];
b = new int[n + 1];
for (i = 0; i < n; i++) {
a[i] = read.nextInt();
}
k = read.nextInt();
for (i = 0; i <= n; i++) {
if (i == n)
b[i] = k;
else
b[i] = 0;
}
for (i = 0; i < n; i++) {
for (j = 0; j < n; j++) {
b[j] = a[i++];
}
}
for (j = 0; j < n; j++) {
for (i = 0; i < n - j; i++) {
if (b[i] > b[i + 1]) {
t = b[i];
b[i] = b[i + 1];
b[i + 1] = t;
}
}
}
for (j = 0; j < n; j++) {
System.out.print(b[j] + " ");
}
System.out.print(b[n]);
}
}
7-2 数组中的最大最小值
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner read = new Scanner(System.in);
int n = read.nextInt();
int[] arr;
arr = new int[n];
int i, j;
for (i = 0; i < arr.length; i++) {
arr[i] = read.nextInt();
}
int max=arr[0],min=arr[0],max1=0,min1=0;
for (i = 1; i max)
{
max=arr[i];
max1=i;
}
if(arr[i]
7-3 数组去除元素
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc=new Scanner(System.in);
int i;
//1.输入数组
int n=sc.nextInt();
int[] num = new int[n];
for(i=0;i
7-1 数组排序
import java.util.Scanner;
public class Main{
public static void main(String[] args){
Scanner sc = new Scanner(System.in);
int n=sc.nextInt();
int[] arr = new int[n];
for(int i=0;i
7-2 数组合并
import java.util.Scanner;
public class Main {
private static void bubbleSort(int[] arr) {
if(arr==null || arr.length < 2 ){
return;
}
for (int i = 0; i < arr.length - 1; i++) {
for (int j = 0; j < arr.length - i -1; j++) {
if (arr[j] > arr[j + 1]) {
int temp = arr[j];
arr[j] = arr[j + 1];
arr[j + 1] = temp;
}
}
}
}
public static void main(String[] args) {
Scanner read= new Scanner(System.in);
int i;
int n = read.nextInt();
int m = read.nextInt();
int array01[] = new int[n];
int array02[] = new int[m];
for (i = 0; i < n; i++) {
array01[i] = read.nextInt();
}
for (i = 0; i < m; i++) {
array02[i] = read.nextInt();
}
int[] totalArray = new int[array01.length + array02.length];
for ( i = 0; i < array01.length; i++) {
totalArray[i] = array01[i];
}
for ( i = 0; i < array02.length; i++) {
totalArray[array01.length + i] = array02[i];
}
bubbleSort(totalArray);
for ( i = 0; i < totalArray.length; i++) {
System.out.print(totalArray[i] + " ");
}
}
}
7-3 数组重排
import java.util.*;
public class fabo {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner sc=new Scanner(System.in);
int n,i,j,ou,p;
n=sc.nextInt();
int[] a=new int[n];
for(i=0;i
7-1 约瑟夫环问题
import java.util.Scanner;
//约瑟夫环
public class Main {
//1.思路分析
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int n,m,i=0,k=1,order=1;
n=scanner.nextInt();
m=scanner.nextInt();
int[] a = new int[n];
//i:待处理的小孩, k:待报的数 ，order：待出列的序号
while(order<=n) {
if(a[i]==0) {
if(k==m) {
a[i]=order++;
k=0;
}k++;
}
i++;
if(i==n)i=0;
}
for(i=0;i
7-2 数组去重
import java.util.Scanner;
public class Main{
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
int n= input.nextInt();
int[] arr = new int[n+1];
for(int i=0;i
7-1 二维数组转置
import java.util.Scanner;
public class Main {
//数组的转置
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
int[][] arr = new int[n][n];
for(int i=0;i
7-2 求对角线的和
import java.util.Scanner;
public class Main{
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
int sum=0;
int[][] arr = new int[n][n];
int m,t=0;
m=(n-1)/2;
for(int i=0;i
7-3 求二维数组的最大最小值
import java.util.Scanner;
//求二维数组的最大值与最小值
public class Main{
public static void main(String[] args) {
//思路分析：
//1.动态初始化数组，初始化最大值，最小值
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
int Max,maxi=0,maxj=0;
int Min,mini=0,minj=0;
int[][] arr = new int[n][n];
//2.输入数组
for(int i=0;iMax) {
Max=arr[i][j];
maxi=i;
maxj=j;
}
}
}
//4.求最小值
for(int i=0;i
7-1 求二维数组的鞍点
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner scanner=new Scanner(System.in);
int n=scanner.nextInt();
int m=scanner.nextInt();
int[][] a = new int[n][m];
for(int i=0;i
7-2 数字螺旋方阵
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
int i,j,num=1;
int[][] a = new int[n][n];
int cnt = n/2;//注意这个cnt
for(i=0; i<=cnt; i++)
{
for(j=i; j=i; j--)
a[n-i-1][j]=num++;
for(j=n-2-i; j>=1+i; j--)
a[j][i]=num++;
}
for(i=0;i
7-3 九宫格的生成
import java.util.Scanner;
public class Main {
public static void main(String[] args){
int n ;
boolean mark = true;
Scanner sc = new Scanner(System.in);
n = sc.nextInt();
while (mark){
if (n % 2 == 0 || n < 0){
n = sc.nextInt();
}
else{
mark = false;
}
}
int[][] arr = new int[n][n];
int a = 0, b = n / 2;
for (int i = 1; i <= n*n; i++){
arr[a][b] = i;
a--;
b++;
if (a < 0 && b >= n){
a += 2;
b--;
}
else if (a < 0){
a = n - 1;
}
else if (b >= n){
b = 0;
}
else if (arr[a][b] != 0){
a += 2;
b--;
}
}
for (int[] c : arr){
for (int d : c){
System.out.printf("%-4d",d);
}
System.out.println();
}
}
}
6-1 方法：求n和m之间的所有素数的和
public static int fun(int b,int a){
int sum=0,j,i,flag;
for(i=a;i<=b;i++){
flag=1;
for(j=2;j<=Math.sqrt(i);j++){
if(i%j==0){
flag=0;
}
}
if(flag==1){
sum+=i;
// sum=sum+i;
}
}
return sum;
}
6-2 递归方法：汉诺塔问题
public static int hano(int n){
int m=2;
for(int i=0;i
6-3 方法重载
static double fun(double a,double b){
double c;
c=a+b;
return c;
}
static String fun(String a,String b){
String c;
c=a+b;
return c;
}
6-4 方法：引用变量做形参
编写方法fun，功能是对整型数组降序排序。
static void fun(int a[]){
int b;
for(int i=0;i
6-1 定义类
class Student{
int sno,age;
String name;
public int getSno() {
return sno;
}
public void setSno(int sno) {
this.sno = sno;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
6-1 学生、大学生、研究生类
class Student{
int no;
String name;
String sex;
public Student(int no, String name, String sex) {
this.no = no;
this.name = name;
this.sex = sex;
}
public void print(){
System.out.println("no: "+this.no);
System.out.println("name: "+this.name);
System.out.println("sex: "+this.sex);
}
}
class CollegeStudent extends Student{
String major;
public CollegeStudent(int no, String name, String sex, String major) {
super(no, name, sex);
this.major = major;
}
public void print(){
super.print();
System.out.println("major: "+this.major);
}
}
class GraduateStudent extends CollegeStudent{
String supervisor;
public GraduateStudent(int no, String name, String sex, String major, String supervisor) {
super(no, name, sex, major);
this.supervisor = supervisor;
}
public void print(){
super.print();
System.out.println("supervisor: "+this.supervisor);
}
public void doResearch(){
System.out.println(this.name+" is doing research");
}
}
6-2 Shape类
abstract class Shape{
abstract double getPerimeter();
abstract double getArea();
}
class Square extends Shape{
double length;
public Square(double length) {
this.length = length;
}
public double getPerimeter(){
return 4*this.length;
}
public double getArea(){
return this.length * this.length;
}
}
class Rectangle extends Square{
double wide;
public Rectangle(double length, double wide) {
super(length);
this.wide = wide;
}
public double getPerimeter(){
return 2*(length+wide);
}
public double getArea(){
return this.length * this.wide;
}
}
class Circle extends Shape{
double radius;
public Circle(double radius) {
this.radius = radius;
}
public double getPerimeter(){
return 2*Math.PI*this.radius;
}
public double getArea(){
return Math.PI*this.radius*this.radius;
}
}
6-3 Student继承Person
int sno;
Student(int sno,String name, int age ) {
super(name, age);
this.sno = sno;
}
public String toString(){
return sno+","+name+","+age;
}
6-1 toString方法
public String toString() {
return getSno()+","+getName()+","+getAge();
}
6-2 初识构造方法
class Student{
public Student(){
System.out.println("This is a constructor");
}
}
6-3 初识构造方法 (10 分)
在Student类中添加带String参数的构造方法，用于对设置name的值。
public Student(String name){
this.name=name;
}
6-1 动物体系
abstract class Animal{
String name;
String color;
public Animal(String s1,String s2) {
this.name=s1;
this.color=s2;
}
public abstract void introduce();
}
class Dog extends Animal{
int iq;
public Dog(String s,String s2,int iq) {
super(s,s2);
this.iq=iq;
}
@Override
public void introduce() {//需要实现introduce
System.out.printf("My name is %s, my color is %s, my IQ is %dn",this.name,this.color,this.iq);
}
public void catchFrisbee() {
System.out.println("catch frisbee");
}
}
class Cat extends Animal{//Cat继承Animal
String eyecolor;
public Cat(String s1,String s2,String s3) {
super(s1,s2);
this.eyecolor=s3;
}
@Override
public void introduce() {//实现introduce
System.out.printf("My name is %s, my color is %s, my eyecolor is %sn",this.name,this.color,this.eyecolor);
}
public void catchMouse() {
System.out.println("catch mouse");
}
}
class TestAnimal{
public static void action(Animal a) {
if(a instanceof Dog) {//注意instanceof的用法
Dog d=(Dog)a;
d.catchFrisbee();
}else if(a instanceof Cat) {
Cat c=(Cat)a;
c.catchMouse();
}
}
public static void introduce(Animal a) {
if(a instanceof Dog) {
Dog d=(Dog)a;
d.introduce();
}else if(a instanceof Cat) {
Cat c=(Cat)a;
c.introduce();
}
}
}
6-2 员工的工资
import java.util.Scanner;
class Employee{
private int salary;
public Employee(int salary) {
this.salary = salary;
}
public int getSalary() {
return salary;
}
}
class Manager extends Employee{
public Manager(int salary) {
super(salary);
}
public int getSalary() {
return super.getSalary();
}
}
class Salesman extends Employee{
private int extra;
public Salesman(int salary, int extra) {
super(salary);
this.extra = extra;
}
public int getSalary(){
return super.getSalary()+this.extra;
}
}
class Worker extends Employee{
private int day;
public Worker(int salary, int day) {
super(salary);
this.day = day;
}
public int getSalary(){
return super.getSalary()* this.day;
}
}
6-1 匿名内部类
new IODevice(){
public void out(){
System.out.println("this is print out");
}
public void getData(String msg){
System.out.println("the print getdata:"+msg);
}
}
6-1 面积求和 (5 分)
interface IGeometry{
final double PI=3.14;
double getArea();
}
class Rect implements IGeometry{
public double a,b;
Rect(double a,double b){
this.a=a;
this.b=b;
}
@Override
public double getArea(){
return a*b;
}
}
class Circle implements IGeometry{
public double r;
Circle(double r){
this.r=r;
}
@Override
public double getArea(){
return PI*r*r;
}
}
class TotalArea{
IGeometry[] tuxing;
void setTuxing(IGeometry[] t){
this.tuxing=t;
}
double computerTotalArea(){
double sum=0;
for(int i=0;i
6-2 Student排序
class Student implements Comparable{
public String name;
public int age;
public Student(String name,int age){
this.name=name;
this.age=age;
}
public int compareTo(Student other) {
if(this.ageother.age)return 1;
return 0;
}
@Override
public String toString(){
return this.name;
}
}
7-1 USB接口的定义
public class Main {
public static void main(String[] args) {
USB usb1=new Mouse();
usb1.work();
usb1.stop();
USB[] usbs=new USB[2];
usbs[0]=new Upan();
usbs[1]=new Mouse();
for(int i=0;i
6-1 static属性成员
class Student{
static int count=1;
Student(){
System.out.printf("当前的Student总人数是：%dn",count);
count++;
}
}
6-2 static方法成员
public static int max(int a,int b){
int p=0;
if(a>b) p=a;
if(b>a) p=b;
return p;
}
6-1 equals方法
public boolean equals(Object d){
if(d instanceof PointA||d instanceof PointB)
return false;
if(d instanceof Point)
return true;
return false;
}
7-1 成绩录入时的及格与不及格人数统计
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc=new Scanner(System.in);
int count=sc.nextInt();
int pass=0;
for (int i=0;i100){
System.out.println(grade+"invalid!");
}else if (grade>=60){
pass++;
}
}
System.out.println(pass);
System.out.println(count-pass);
}
}
7-2 编程题：判断闰年
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
int n;
Scanner input = new Scanner(System.in);
n=input.nextInt();
if(n%40&&n%100!=0||n%4000) {
System.out.println(“yes”);
}
else {
System.out.println(“no”);
}
}
}
7-5 分解质因数
import java.util.Scanner;
public class Main{
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int a=sc.nextInt();
int b=sc.nextInt();
for(int i=a;i<=b;i++) {
System.out.print(i+"=");
int temp=i;
for(int j=2;j
System.out.print(j+"*");
temp = temp/j;
j–;
}
}
System.out.println(temp);
}
}
}
7-6 统计最大数出现次数
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int a;
int max = -1;
int count=1;
do {
a=sc.nextInt();
if(max
max=a;
count=1;
}else if(max==a)
count++;
}while(a!=0);
System.out.println("The largest number is "+max);
System.out.println("The occurrence count of the largest number is "+count);
}
}
7-10 jmu-Java-03面向对象基础-04-形状-继承
import java.awt.*;
import java.util.Arrays;
import java.util.Scanner;
public class Main{
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int n= sc.nextInt();
sc.nextLine();
Shape[] shapes=new Shape[n];
for (int i = 0; i < n; i++) {
String s=sc.nextLine();
if (s.equals(“rect”)){
shapes[i]=new Rectangle(sc.nextInt(), sc.nextInt());
sc.nextLine();
}else if (s.equals(“cir”)){
shapes[i]=new Circle(sc.nextInt());
sc.nextLine();
}
}
System.out.println(sumAllPerimeter(shapes));
System.out.println(sumAllArea(shapes));
System.out.println(Arrays.toString(shapes));
for (Shape s: shapes) {
System.out.println(s.getClass()+","+s.getClass().getSuperclass());
}
}
public static double sumAllArea(Shape[] ss){
double ret=0;
for (Shape s : ss) {
ret += s.getArea();
}
return ret;
}
public static double sumAllPerimeter(Shape[] ss){
double ret=0;
for (Shape s:ss) {
ret+=s.getPerimeter();
}
return ret;
}
}
abstract class Shape{
static double PI=3.14;
public abstract double getPerimeter();
public abstract double getArea();
}
class Rectangle extends Shape{
private int width;
private int length;
public Rectangle(int width, int length) {
this.width = width;
this.length = length;
}
public int getWidth() {
return width;
}
public void setWidth(int width) {
this.width = width;
}
public int getLength() {
return length;
}
public void setLength(int length) {
this.length = length;
}
public double getPerimeter(){
return 2.0*(this.length+this.width);
}
public double getArea(){
return this.length*this.width;
}
@Override
public String toString() {
return "Rectangle [" +
"width=" + width +
", length=" + length +
']';
}
}
class Circle extends Shape{
private int radius;
public Circle(int radius) {
this.radius = radius;
}
public int getRadius() {
return radius;
}
public void setRadius(int radius) {
this.radius = radius;
}
public double getPerimeter(){
return 2*PI*this.radius;
}
public double getArea(){
return PI*Math.pow(this.radius,2);
}
@Override
public String toString() {
return "Circle [" +
"radius=" + radius +
']';
}
}
7-15 USB接口的定义
public class Main {
public static void main(String[] args) {
USB usb1;
usb1=new Mouse();
usb1.work();
usb1.stop();
USB[] usbs;
usbs = new USB[2];
usbs[0]=new UPan();
usbs[1]=new Mouse();
for(USB i:usbs) {
i.work();
i.stop();
}
}
}
interface USB{
void work();
void stop();
}
class Mouse implements USB{
public void work() {
System.out.println(“我点点点”);
}
public void stop() {
System.out.println(“我不能点了”);
}
}
class UPan implements USB{
public void work() {
System.out.println(“我存存存”);
}
public void stop() {
System.out.println(“我走了”);
}
}
7-16 jmu-Java-03面向对象基础-01-构造函数与toString
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner reader = new Scanner(System.in);
int number = reader.nextInt();
Person[] per = new Person[number];
for(int i=0;i
int age = reader.nextInt();
boolean gender = reader.nextBoolean();
per[i]=new Person(name,age,gender);
}
for(int x=per.length-1;x>=0;x–) {
per[x].toString();
}
per.toString();
Person s=new Person();
}
}
class Person{
private String name =null;
private int age=0;
private boolean gender = false;
private int id = 0;
public Person() {
System.out.println("This is constructor");
System.out.println(name+","+age+","+gender+","+id);
System.out.println("Person [name="+name+", age="+age+", gender="+gender+", id="+id+"]");
}
public Person(String n, int a, boolean g) {
super();
this.name =n;
this.age = a;
this.gender = g;
}
@Override
public String toString() {
System.out.println( "Person [name=" + name + ", age=" + age + ", gender=" + gender + ", id=" + id + "]");
return name;
}
}
7-17 定义商品类，封装成员变量，输出对象
import java.util.Scanner;
public class Main{
public static void main(String[] args) {
Scanner sc= new Scanner(System.in);
String number = sc.next();
String name = sc.next();
double price = sc.nextDouble();
stuff a = new stuff(number, name, price);
System.out.println(a.getNumber()+","+a.getName()+","+a.getPrice());
}
}
class stuff{
private String number;
private String name;
private double price;
public String getNumber;
public String getNumber() {
return number;
}
public void setNumber(String number) {
this.number = number;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
public stuff(String number, String name, double price) {
super();
this.number = number;
this.name = name;
this.price = price;
}
}
7-18 定义类与创建对象
public class Main {
public static void main(String[] args) {
Person p1 = new Person(“lili”,19);
Person p2 = new Person(“lucy”, 20);
System.out.println("this person is “+p1.name+”,her age is "+p1.age);
System.out.println("this person is “+p2.name+”,her age is "+p2.age);
}
}
class Person{
String name;
int age;
public Person(String name,int age) {
this.name = name;
this.age=age;
}
}
6-1 jmu-Java-06异常-finally
System.out.println(“resource open success”);
}
catch(Exception e)
{
System.out.println(e);
}
try{
resource.close();
System.out.println(“resource release success”);
}
catch(RuntimeException e)
{
System.out.println(e);
}
6-2 jmu-Java-06异常-多种类型异常的捕获
catch(NumberFormatException e){
System.out.println(“number format exception”);
System.out.println(e);
}catch(IllegalArgumentException e){
System.out.println(“illegal argument exception”);
System.out.println(e);
}catch(Exception e){
System.out.println(“other exception”);
System.out.println(e);
}
还差java复习题的两题
7-14 教师类 (10 分)
import java.awt.*;
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner s=new Scanner(System.in);
Teacher a=new Teacher(s.nextInt(),s.next(),s.nextInt(),s.next());
Teacher b=new Teacher(s.nextInt(),s.next(),s.nextInt(),s.next());
System.out.println(a.toString());
System.out.println(b.toString());
System.out.println(a.equals(b));
}
}
class Teacher{
int no;
String name;
int age;
String seminary;
public int getNo() {
return no;
}
public int getAge() {
return age;
}
public String getName() {
return name;
}
public String getSeminary() {
return seminary;
}
public void setNo(int no) {
this.no = no;
}
public void setAge(int age) {
this.age = age;
}
public void setName(String name) {
this.name = name;
}
public void setSeminary(String seminary) {
this.seminary = seminary;
}
public Teacher(int no,String name,int age,String seminary){
this.no=no;
this.age=age;
this.name=name;
this.seminary=seminary;
}
public boolean equals(Teacher b) {
if(this.no==b.no&&this.name==b.name)
return true;
else
return false;
}
public String toString(){
return "no: "+this.no+", name:"+this.name+", age: "+this.age+", seminary: "+this.seminary;
}
}
7-1各类字符数
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc=new Scanner(System.in);
String s=sc.nextLine();
char[] ns=s.toCharArray();
int upCount=0;
int lowCount=0;
int count=0;
for(int i=0;i=65&&ns[i]<=90){
upCount++;
}else if(ns[i]>=97&&ns[i]<=127){
lowCount++;
}else{
count++;
}
}
System.out.println(upCount);
System.out.println(lowCount);
System.out.println(count);
sc.close();
}
}
7-3 编程题：统计符合条件元素的个数 (8 分)
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc=new Scanner(System.in);
int num=sc.nextInt();
int jCount=0;
int oCount=0;
for (int i = 1; i <=num ; i++) {
if(i%30){
if(i%20){
oCount++;
}else{
jCount++;
}
}
}
System.out.println(jCount+","+oCount);
sc.close();
}
}
7-4 字母图形 (15 分)
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc=new Scanner(System.in);
int n=sc.nextInt();
int m=sc.nextInt();
char num=‘A’;
for(int i=0;i
}
System.out.println();
}
}
}
7-7 通过键盘输入一行字符，分别统计出其中英文字母、空格、数字和其它字符的个数。 (10 分)
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc=new Scanner(System.in);
String str=sc.nextLine();
char[] chars=str.toCharArray();
int letter=0,num=0,blank=0,other=0;
for (int i = 0; i < chars.length; i++) {
if(chars[i]>=‘a’&&chars[i]<=‘z’||chars[i]>=‘A’&&chars[i]<=‘Z’){
letter++;
}else if(chars[i]>=47&&chars[i]<=57){
num++;
}else if(chars[i]==32){
blank++;
}else{
other++;
}
}
System.out.println(“字母个数：”+letter);
System.out.println(“数字个数：”+num);
System.out.println(“空格个数：”+blank);
System.out.println(“其他字符个数：”+other);
}
}
7-8 sdust-Java-字符串集合求并集
import java.util.Iterator;
import java.util.Scanner;
import java.util.TreeSet;
public class Main {
public static void main(String[] args) {
Scanner sc=new Scanner(System.in);
String str=sc.nextLine();
String[] s=str.split(" ");
TreeSet s1=new TreeSet<>();
TreeSet s2=new TreeSet<>();
int i=0;
while (s1.size()<5&&i
}
while (s2.size()<5&&i
}
TreeSets3=new TreeSet<>();
s3.addAll(s1);
s3.addAll(s2);
Iterator it=s3.iterator();
while (it.hasNext()){
System.out.println(it.next());
}
}
}
7-9 sdust-Java-学生成绩读取与排序
import java.util.*;
class Student implements Comparable{
private String name,id;
private int subject=1;
private int score;
private double sum=0;
Student(){}
Student(String name,String id,int score){
this.name=name;
this.id=id;
this.score=score;
}
public String getid(){
return this.id;
}
public void subjectadd() {
this.subject++;
}
public void scoreadd(int score){
this.score=this.score+score;
}
public String getname() {
return this.name;
}
public void sum() {
this.sum=this.score/this.subject;
}
public int compareTo(Student o1){
Student one = (Student) o1;
if(this.sum-one.sum!=0)
return (int)(one.sum-this.sum);
else
return this.id.compareTo(one.id);
}
}
public class Main{
public static void main(String[] args) {
Scanner sc=new Scanner(System.in);
List list =new ArrayList();
int i,flag=0;
String k;
String[] and =new String[5];
while(sc.hasNext())
{
k=sc.next();
and=k.split(",");
if(k.compareTo("exit")==0)
break;
for(i=0;i
}
7-12 程序改错题2
public class Main {
public static void main(String[] args) {
Animal animal = new Dog();
animal.shout();
((Dog) animal).run();
}
}
class Animal {
void shout() {
System.out.println(“animal shout！”);
}
}
class Dog extends Animal {
@Override
void shout() {
super.shout();
System.out.println("wangwang……");
}
void run() {
System.out.println("Dog is running");
}
7-13 程序填空题3 (5 分)
public class Main {
public static void main(String[] args) {
Son son = new Son();
son.method();
}
}
class Parent {
Parent() {
System.out.println(“Parent’s Constructor without parameter”);
}
Parent(boolean b) {
System.out.println("Parent's Constructor with a boolean parameter");
}
public void method() {
System.out.println("Parent's method()");
}
}
class Son extends Parent {
private static boolean b;
Son()
{
super(b);
System.out.println(“Son’s Constructor without parameter”);
}
public void method() {
System.out.println(“Son’s method()”);
System.out.println(“Parent’s method()”);
}
}
7-14 设计一个Shape及其子类Oval (20 分)
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
double m = sc.nextDouble();
double n = sc.nextDouble();
Oval oval = new Oval(m, n);
System.out.println("The area of " + oval + " is " + oval.area());
System.out.println("The perimeterof " + oval + " is " + oval.perimeter());
}
}
abstract class Shape {
protected static final double PI = 3.1415926;
abstract double area();
abstract double perimeter();
}
class Oval extends Shape {
private double a;
private double b;
public Oval(double a, double b) {
this.a = a;
this.b = b;
}
public Oval() {
a = 0;
b = 0;
}
@Override
public double area() {
return PI * a * b;
}
@Override
public double perimeter() {
return 2 * PI * Math.sqrt((a * a + b * b) / 2);
}
@Override
public String toString() {
return "Oval(a:" + a + ",b:" + b + ")";
}
}
7-20 好玩的图形 (20 分)
import java.util.*;
interface Shape {
public float getArea();
public float getPerimeter();
}
class Circle implements Shape {
float radius;
public Circle(float radius) {
this.radius = radius;
}
public float getArea() {
float ans = (float) (Math.PI * radius * radius);
return (float) ans;
}
public float getPerimeter() {
float ans = (float) (2 * Math.PI * radius);
return (float) ans;
}
}
class Rectangle implements Shape {
float length, width;
public Rectangle(float length, float width) {
this.length = length;
this.width = width;
}
public float getArea() {
float ans = length * width;
return (float) ans;
}
public float getPerimeter() {
float ans = 2 * (length + width);
return (float) ans;
}
}
public class Main {
static public void main(String[] args) {
Scanner input = new Scanner(System.in);
int n = input.nextInt();
for (int i = 0; i < n; i++) {
int flag = input.nextInt();
if (flag == 1) {
float radius = input.nextFloat();
Circle c = new Circle(radius);
String ans1 = String.format("%.2f", c.getArea());
String ans2 = String.format("%.2f", c.getPerimeter());
System.out.println(ans1 + " " + ans2);
}
else {
float length = input.nextFloat();
float width = input.nextFloat();
Rectangle m = new Rectangle(length, width);
String ans1 = String.format("%.2f", m.getArea());
String ans2 = String.format("%.2f", m.getPerimeter());
System.out.println(ans1 + " " + ans2);
}
}
input.close();
}
}
7-2 sdut-顺序结构-1 利用海伦公式求三角形面积
import java.util.Scanner;
import java.util.*;
public class Main {
public static void main(String[] args){
Scanner sc=new Scanner(System.in);
double a,b,c,s;
double area;
while(sc.hasNextDouble()) {
a = sc.nextDouble();
b = sc.nextDouble();
c = sc.nextDouble();
if(a+b>c&&a+c>b&&b+c>a) {
s=(a+b+c)/2;
area=(Math.sqrt(s*(s-a)*(s-b)*(s-c)));
System.out.printf("%.2fn",area);
}
else {
System.out.println("Input Error!");
}
}
}
}
7-3 sdut-温度转换
import java.util.Scanner;
public class Main {
public static void main(String args[]) {
Scanner sc=new Scanner(System.in);
double N;
double n=sc.nextDouble();
N=5.0*(n-32)/9;
System.out.printf("%.2f",N) ;
}
}
6-3 接口与多态
class Circle implements Shap{
Double r;
final double PI=3.14;
public Circle(double parseDouble) {
super();
this.r = parseDouble;
}
@Override
public double f() {
if(r<=0) return 0;
return 2*PI*r;
}
}
class Rect implements Shap{
Double a,b;
public Rect(double parseDouble, double parseDouble2) {
super();
this.a = parseDouble;
this.b = parseDouble2;
}
@Override
public double f() {
if(a<=0||b<=0) return 0;
return 2*(a+b);
}
}
class Tri implements Shap{
Double a,b,c;
public Tri(double parseDouble, double parseDouble2, double parseDouble3) {
super();
this.a = parseDouble;
this.b = parseDouble2;
this.c = parseDouble3;
}
@Override
public double f() {
if(a+b
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