java练习题求完整代码

java练习题求完整代码,第1张

按照题目要求编写的用javaBean规范设计的学生类Student的Java程序如下

需要创建user.java.test包,把Student.java文件和Test.java文件放入包中,编译Student.java文件并且编译运行Test.java文件得到运行结果

Student.java文件扮租代码如下

package user.java.test

import java.io.Serializable

public class Student implements Serializable{

private static final long serialVersionUID = 1L

private String no

private String name

private double score

public Student(){}

public Student(String no,String name,double score){

this.no=no

this.name=name

this.score=score

}

public String getNo(){ return no}

public void setNo(String no){ this.no=no}

public String getName(){ return name}

public void setName(String name){ this.name=name}

public double getScore(){ return score}

public void setScore(double score){ this.score=score}

public String toString(){

return "学号:"+no+",姓名:"+name+",成绩:"+score

}

public static double getAvg(Student[] sArray){

double sum=0,avg

for(int i=0i<sArray.lengthi++){

sum=sum+sArray[i].getScore()

}

avg=sum/sArray.length

return avg

}

}

Test.java文件代码如下

package user.java.test

public class Test{

public static void main(String[] args){

Student[] sArray=new Student[5]

sArray[0]=new Student("001","张三",89.5)

sArray[1]=new Student("002","李四",82.5)

sArray[2]=new Student("003","王五",93)

sArray[3]=new Student("004"皮缺和,"赵六",73.5)

sArray[4]=new Student("005","燃盯孙七",66)

System.out.println("这些学生的平均分:"+Student.getAvg(sArray))

for(int i=0i<sArray.lengthi++){

System.out.println(sArray[i].toString())

}

}

}

很详细的帮你写下,呵呵,所以要给分哦!

1、

(1)源程序如下:

public class One {

public static void main(String[] args) {

String name = "张三"

int age = 23

char sex = '男'

String myclass = "某某专业2班"

System.out.println("姓名:" + name)

System.out.println("姓名:" + age)

System.out.println("姓名:" + sex)

System.out.println("姓名:" + myclass)

}

}

(2)

编写完程序的后缀名是.java,如本题,文件名就是One.java。

开始\运行\cmd,进入“命令提示符窗口”,然后用javac编译器编译.java文件,语句:javac One.java。

(3)

编译成功后,生成的文件名后缀是.class,叫做字节码文件。再用java解释器冲搜纳来运行改程序,语句:java One

2、编写程序,输出1到100间的所有偶数

(1)for语句

public class Two1 {

public static void main(String[] args) {

for(int i=2i<=100i+=2)

System.out.println(i)

}

}

(2)while语句

public class Two2 {

public static void main(String[] args) {

int i = 2

while (i <= 100) {

System.out.println(i)

i += 2

}

}

}

(3)do…while语漏芹句

public class Two3 {

public static void main(String[] args) {

int i = 2

do {

System.out.println(i)

i += 2

}while(i<=100)

}

}

3、编写程序,从10个数当中找出最大散没值。

(1)for循环

import java.util.*

public class Three1 {

public static void main(String[] args) {

Scanner input = new Scanner(System.in)

int number

int max = 0

for (int i = 0i <10i++) {

System.out.print("输入第" + (i + 1) + "个数:")

number = input.nextInt()

if (max <number)

max = number

}

System.out.println("最大值:" + max)

}

}

(2)while语句

import java.util.*

public class Three2 {

public static void main(String[] args) {

Scanner input = new Scanner(System.in)

int number

int max = 0

int i = 0

while (i <10) {

System.out.print("输入第" + (i + 1) + "个数:")

number = input.nextInt()

if (max <number)

max = number

i++

}

System.out.println("最大值:" + max)

}

}

(3)do…while语句

import java.util.*

public class Three3 {

public static void main(String[] args) {

Scanner input = new Scanner(System.in)

int number

int max = 0

int i = 0

do {

System.out.print("输入第" + (i + 1) + "个数:")

number = input.nextInt()

if (max <number)

max = number

i++

}while(i<10)

System.out.println("最大值:" + max)

}

}

4、编写程序,计算从1到100之间的奇数之和。

(1)for循环

public class Four1 {

public static void main(String[] args) {

int sum=0

for(int i = 1i<=100i+=2){

sum+=i

}

System.out.println("1~100间奇数和:" + sum)

}

}

(2)while语句

public class Four2 {

public static void main(String[] args) {

int sum = 0

int i = 1

while (i <= 100) {

sum += i

i += 2

}

System.out.println("1~100间奇数和:" + sum)

}

}

(3)do…while语句

public class Four3 {

public static void main(String[] args) {

int sum = 0

int i = 1

do {

sum += i

i += 2

} while (i <= 100)

System.out.println("1~100间奇数和:" + sum)

}

}

5、

(1)什么是类的继承?什么是父类?什么是子类?举例说明。

继承:是面向对象软件技术当中的一个概念。如果一个类A继承自另一个类B,就把这个A称为"B的子类",而把B称为"A的父类"。继承可以使得子类具有父类的各种属性和方法,而不需要再次编写相同的代码。在令子类继承父类的同时,可以重新定义某些属性,并重写某些方法,即覆盖父类的原有属性和方法,使其获得与父类不同的功能。另外,为子类追加新的属性和方法也是常见的做法。继承需要关键字extends。举例:

class A{}

class B extends A{}

//成员我就不写了,本例中,A是父类,B是子类。

(2)编写一个继承的程序。

class Person {

public String name

public int age

public char sex

public Person(String n, int a, char s) {

name = n

age = a

sex = s

}

public void output1() {

System.out.println("姓名:" + name + "\n年龄:" + age + "\n性别:" + sex)

}

}

class StudentPerson extends Person {

String school, department, subject, myclass

public StudentPerson(String sc, String d, String su, String m, String n,

int a, char s) {

super(n, a, s)

school = sc

department = d

subject = su

myclass = m

}

public void output2() {

super.output1()

System.out.println("学校:" + school + "\n系别:" + department + "\n专业:"

+ subject + "\n班级:" + myclass)

}

}

public class Five2 {

public static void main(String[] args) {

StudentPerson StudentPersonDemo = new StudentPerson("某某大学", "某某系别",

" 某专业", "某某班级", " 张三", 23, '男')

StudentPersonDemo.output2()

}

}

import java.util.Scanner

public class Test1 {

/**

* 本息计算方州顷做式:册衡本金+本金×年利率×多少年

*/

public static void main(String[] args) {

Scanner cin = new Scanner(System.in)

System.out.println("请输入本金数:")

double ben = cin.nextDouble()

System.out.println("请输入乎缓存款年数:")

int year = cin.nextInt()

double benxi = 0

if(year==1)

benxi = ben*(1+2.25/100.0)

else if(year==2)

benxi = ben*(1+2.7/100.0)

else if(year==3)

benxi = ben*(1+3.24/100.0)

else if(year==5)

benxi = ben*(1+3.6/100.0)

System.out.println("银行需要支付的本息是:"+benxi)

}

}


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