11:B类继承了A类,B是A的子类,A是B的父类
12:多态
13:I love: java and 268
2:// 仅供参考
3// 仅供参考
class car
{
private String carName;
private String carColor;
public Car(String carName, String carColor) {
thiscarColor=carColor;
thiscarName=carName;
}
public void setcarName(String carName)
{
thiscarName=carName;
}
public void setcarColor(String carColor)
{
thiscarColor=carColor;
}
public String getcarName()
{
return carName;
}
public String getcarColor()
{
return carColor;
}
void run()
{
Systemoutprintln("Car can run");
}
public class Rectangle { private double width; private double height; private String colour; public double getWidth() { return width; } public void setWidth(double width) { thiswidth = width; } public double getHeight() { return height; } public void setHeight(double height) { thisheight = height; } public String getColour() { return colour; } public void setColour(String colour) { thiscolour = colour; } public Rectangle(double width, double height, String colour) { super(); thiswidth = width; thisheight = height; thiscolour = colour; } public Rectangle() { super(); } public void getArea(double width, double height, String colour){ Systemoutprintln("矩形的宽:"+width+"cm"); Systemoutprintln("矩形的高:"+height+"cm"); Systemoutprintln("矩形的颜色 :"+colour); Systemoutprintln("矩形的面积 :" +widthheight); } public static void main(String[] args) { Rectangle r1= new Rectangle(); r1getArea(40, 20, "Red色"); Rectangle r2= new Rectangle(); r2getArea(30, 60, "红色"); } }
public class Animal {
public String name;
public int age;
public String gender;
public String color;
public Animal(int age) {
thisage = age;
}
public void happy() {}
public void unhappy(){}
}
public class Dog extends Animal {
public Dog(int age) {
spuer(age);
}
private void actAsDoorkeeper() {}
private void eatBone() {}
}
public class Cat extends Animal {
public Cat(int age) {
super(age);
}
private void catchMouse() {}
private void eatFish() {}
}
public class MainClass{
public static void main(String args[]) {
Dog dog = new Dog(3);
Cat cat = new Cat(4);
if(dogage>catage) {
doghappy();
catunhappy();
}else if(dogage<catage) {
dogunhappy();
cathappy();
}else {
doghappy();
cathappy();
}
}
}
//不知是否是楼主想要的
package comdemo;
import javamathBigDecimal;
import javautilRandom;
import javautilScanner;
/
Java编写一个能够自动生成小朋友算术练习题目的程序。设计一个程序,要求能够随机生成每个题目。
编写一个能够自动生成小朋友算术练习题目的程序。设计一个程序,要求能够随机生成每个题目,并具有以下基本功能:
(1)要求题目以单项选择题及填空题两种形式出现。
(2)完成一题后自动判断答案是否正确,分别d出不同的提示,并自动更新成下一题。
(3)单击“退出”时,汇总本次计算结果,共完成几题,正确率,并给出相应评语。确定后正式退出。
/
public class publicDemo2 {
public static void main(String[] args) {
Random random = new Random();
StringBuilder stringBuilder = new StringBuilder();
String[] symbol = {"+","-","","/"};
String question_tip = "选择题(除法保留小数点后两位):";
stringBuilderappend(question_tip)append("\n");
Systemoutprintln(question_tip);
int a;
int b;
String f;
String result_str;
for (int i=1;i<11;i++){
a = randomnextInt(50);
b = randomnextInt(50);
f = symbol[randomnextInt(3)];
String question = i+"、"+a+f+b+"=";
Systemoutprintln(question);
stringBuilderappend(question);
Scanner sc = new Scanner(Systemin);
String sc_str = scnext();
if("/"equals(f)){
double scan_value = DoubleparseDouble(sc_str);
double result_value = a / b;
BigDecimal bigDecimal1 = new BigDecimal(scan_value);
scan_value = bigDecimal1setScale(2, BigDecimalROUND_HALF_UP)doubleValue();
BigDecimal bigDecimal2 = new BigDecimal(result_value);
result_value = bigDecimal2setScale(2, BigDecimalROUND_HALF_UP)doubleValue();
result_str = (scan_value==result_value)"回答正确!":"回答错误!";
stringBuilderappend(scan_value)append(";(答案:"+result_value+")"+result_str)append("\n");
}else{
int scan_value = IntegerparseInt(sc_str);
int result_value;
if("+"equals(f)){
result_value = a + b;
}else if("-"equals(f)){
result_value = a - b;
}else if(""equals(f)){
result_value = a b;
}else{
break;
}
result_str = (scan_value==result_value)"回答正确!":"回答错误!";
stringBuilderappend(scan_value)append(";(答案:"+result_value+")"+result_str)append("\n");
}
}
Systemoutprintln(stringBuildertoString());
}
}
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