JAVA第三次作业
package JavaPractice; class Monkey { private String s; public Monkey() { } public Monkey(String s) { this.s=s; } public String getS() { return s; } public void speak() { System.out.println("咿咿呀呀......"); } } class People extends Monkey { public void speak() { System.out.println("小样的,不错嘛!会说话了!"); } public void think() { System.out.println("别说话!认真思考!"); } } public class E { public static void main(String[] args) { Monkey m=new Monkey(); People p=new People(); m.speak(); p.speak(); p.think(); } } 第二题: package JavaPractice; import java.util.Scanner; class Rectangle { private double length; private double width; public double getLength() { return length; } public double getWidth() { return width; } public Rectangle(double length, double width) { this.length = length; this.width = width; } public double getArea() { return length*width; } } class Cuboid extends Rectangle { private double height; public double getHeight() { return height; } public Cuboid(double length, double width, double height) { super(length, width); this.height = height; } public double getVolume() { return getLength()*getWidth()*height; } } public class TestPattern { public static void main(String[] args) { Scanner sc=new Scanner(System.in); System.out.println("请分别输入长方形的长、宽:"); Rectangle rc=new Rectangle(sc.nextDouble(),sc.nextDouble()); System.out.println("长方形的面积为:"+rc.getArea()); System.out.println(); System.out.println("请分别输入长方体的长、宽、高:"); Cuboid cb=new Cuboid(sc.nextDouble(),sc.nextDouble(),sc.nextDouble()); System.out.println("长方体的底面积为:"+cb.getArea()); System.out.println("长方体的体积为:"+cb.getVolume()); } } 第三题: package LHB.inherit; import java.util.*; class Vehicle { int wheels,weight;/*车轮个数,车重*/ public Vehicle(int wheels,int weight) { this.wheels=wheels; this.weight=weight; } public void print() { System.out.println("车轮个数是:"+wheels+"个\n"+"车重是:"+weight); } } class Car extends Vehicle { int loader;/*车载人数*/ public Car(int wheels, int weight,int loader) { super(wheels, weight); this.loader=loader; } public void print() { System.out.println("车载人数是:"+loader); } } class Truck extends Car { int payload;/*载重量*/ public Truck(int wheels, int weight, int loader,int payload) { super(wheels, weight, loader); this.payload=payload; } public void print() { System.out.println("载重量是:"+payload); } } public class Testcar { public static void main(String[] args) { Scanner in=new Scanner(System.in); int wheels,weight,loader,payload; System.out.print("请输入车轮个数,车重,车载人数,载重量:"); wheels=in.nextInt(); weight=in.nextInt(); loader=in.nextInt(); payload=in.nextInt(); Vehicle p1=new Vehicle(wheels,weight); Car p2=new Car(wheels,weight,loader); Truck p3=new Truck(wheels,weight,loader,payload); p1.print(); p2.print(); p3.print(); } }