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使用Java完成下面程序

java 2025/7/13 12:59:16

第一题： 1.定义一个Animal类,包含如下行为: eat() 打印"要吃饭" run() 打印"会跑步" sleep() 打印"要睡觉"

2.定义一个Dog类,继承Animal类,重写eat(),run()方法定义自己特有的行为 : cry() 打印"狗会汪汪叫" 3.定义测试类DogTest, 创建Dog的对象,依次调用eat(),run(),sleep(),cry()方法,打印出如下语句狗要吃那啥狗跑的如脱缰的野狗要睡觉狗会汪汪叫

Animal类代码如下

public class Animal {public void eat() {System.out.println("要吃饭");}public void sleep() {System.out.println("要睡觉");}public void run(){System.out.println("会跑步");}
}

Dog类代码如下

public class Dog extends Animal {public void eat(){System.out.println("狗要吃那啥");}public void run(){System.out.println("狗跑的如脱缰的野马");}public void cry(){System.out.println("狗会汪汪叫");}}

测试类代码如下

public class DogTest {public static void main(String[] args) {Dog d = new Dog();d.eat();d.run();d.sleep();d.cry();}
}

结果如下

第二题： 1.定义Person类,包含空参、满参构造和以下成员变量: 姓名name 年龄age 生成所有成员变量set/get方法定义方法：void printPerson(),打印出"我是山顶洞人"

2.定义Student继承于Person类,新增如下属性学校 school 生成空参、满参构造和set/get方法定义方法: void printStudent(),先输出"我叫XXX,我今年YYY岁,我现在的学校是:ZZZ" 重写方法：void printPerson(),打印出"我叫XXX,我是山顶洞人"

3.在测试类中,创建并初始化一个Student 对象 s, 调用printStudent()方法,打印出如下语句:

我叫卡特琳娜,我今年19岁,我现在的学校是:战争学院

我叫卡特琳娜,我是山顶洞人

Person类代码如下

public class Person {String name;int age;public String getName() {return name;}public void setName(String name) {this.name = name;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}void printPerson(){System.out.println("我是山顶洞人");}}

Student类代码如下

public class Student1 extends Person{String school;public Student1(){}public void Student1(String name, int age, String school){}public String getSchool() {return school;}public void setSchool(String school) {this.school = school;}void printStudent1(){System.out.println("我叫"+name+"我今年"+age+"岁,"+"我现在学校是："+school);}@Overridevoid printPerson() {System.out.println("我叫"+name+",我是山顶洞人");}
}

测试类代码如下

public class TestStudent1 {public static void main(String[] args) {Student1 s1 = new Student1();s1.name = "卡特琳娜";s1.age = 19;s1.school = "战争学院";s1.printStudent1();s1.printPerson();}
}

结果如下

第三题：设计一个形状类Shape,方法:求周长和求面积,属性：圆周率PI

形状类的子类:

Rect(矩形) 属性 width height 重写求面积和周长的方法

Circle(圆形)属性 r 重写求面积和周长的方法

Circle圆形的子类：cylinder(圆柱形),有属性 height,定义方法volume

求圆柱提交 Rect类的子类:Square(正方形) 在测试类中，

1.分别创建以上对象并赋值

2.获取每一个对象，并调用其周长和面积的方法

Shape类代码如下

public class Shape {public void zhouChang(){}public void area(){}final double PI = 3.14;}

矩形Rect类代码如下

public class Rect extends Shape{int width;int height;public int getHeight() {return height;}public void setHeight(int height) {this.height = height;}public int getWidth() {return width;}public void setWidth(int width) {this.width = width;}public void zhouChang(int width,int height){System.out.println("矩形周长为："+(width+height)*2);}public void area(int width,int height){System.out.println("矩形面积为："+width*height);}
}

圆形Circlel类代码如下

public class Circle extends Shape {public int getR() {return r;}public void setR(int r) {this.r = r;}int r;public void zhouChang(int r){System.out.println("圆的周长为："+2*PI*r);}public void area(int r){System.out.println("圆的面积为："+PI*r*r);}
}

圆柱形Cylinder类代码如下

public class Cylinder extends Circle{public int getHeight() {return height;}public void setHeight(int height) {this.height = height;}int height;public void volume(int height,double PI,int r){System.out.println("圆柱面积为："+height*PI*r*r);}
}

正方形Square类代码如下

public class Square extends Rect {public void area(int width, int height){System.out.println("正方形面积为："+width*height);}public void zhouChang(int width, int height){System.out.println("正方形周长为："+2*(width+height));}
}

测试类代码如下

public class TestShape {public static void main(String[] args) {Rect rect = new Rect();rect.zhouChang(4,6);rect.area(4,6);Circle circle = new Circle();circle.area(5);circle.zhouChang(5);Cylinder cylinder = new Cylinder();cylinder.area(5);cylinder.zhouChang(5);Square square = new Square();square.area(6,6);square.zhouChang(6,6);}
}

结果如下