2.
package cshdezuonie；
public class Monkey{
Monkey（String s）
{
}
pubilc void speak（）
{
Syatem.out.printin（"咿咿呀呀......”）；
}
}
package cshdezuonie;
public class Peale1 extends Monkey{
People1(String s){
suger(s);
}
pubilc 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！");
}
}
package cshdezuonie;
public class E1{
public static void main(String[ ] args){
Monkey m = new Monkey("tom");
m.speak();
People1 p = new People1("Xiaoming");
p.speak();
p.think();
}
}
3.
package csh；
import java.util.*；
class Rectangle
{
int length,width;
public int area(int length,int width)
{
this.length=length;
this.width=width;
int a;
s=length*width;
return s;
}
}
class Cuboid extends Rectangle
{
int length,width,heigth;
pubilc Cuboid(int length,int width,int heigth)
{
this.length=length;
this.width=width;
this.heigth=heigth;
}
public int area()
{
int a;
a=length*width;
return s;
}
public int Volume()
{
int v;
v=area()*heigth;
return v;
}
}
public class Test
public static void main(String[ ] args)
{
int length,width,heigth;
Scanner in=new Scanner (System.in);
System.out.print("输入长宽高：");
length=in.nextInt();
width=in.nextInt();
heigth=in.nextInt();
Rectangle p=new Rectangle();
Cuboid q=new Cuboid(length,width,heigth);
System.out.println("矩形的面积是："+p.area(length,width);
System.out.println("长方体的体积是："+p.Volume);
}
}
4.
package disici;
import java.util.*;class vehicle{ private String wheels; private String weight; public void setwheels() { this.wheels=wheels; } public int getwheels(int wheels) { return wheels; } public void setweight() { this.weight=weight; } public int getweight(int weight) { return weight; } public void measge(int wheels,int weight) { System.out.println("轮胎数："+wheels+"重量："+weight); }}class car extends vehicle { private String loader; public void setloader() { this.loader=loader; } public int getloader(int loader) { return loader; } public void measge(int loader) { System.out.println("载人数："+loader); }}class Truck extends car{ private String payload; public void setpayload() { this.payload=payload; } public int getpayload(int payload) { return payload; } public void measge(int payload) { System.out.println("载重量："+payload); }}public class qiche { public static void main(String[]args) { Scanner ex=new Scanner(System.in); System.out.println("请输入轮胎数："); int wheels=ex.nextInt(); ex.hasNextLine(); System.out.println("请输入重量："); int weight=ex.nextInt(); ex.hasNextLine(); System.out.println("请输入载人数："); int loader=ex.nextInt(); ex.hasNextLine(); System.out.println("请输入载重："); int payload=ex.nextInt(); ex.hasNextLine(); vehicle e1=new vehicle(); car e2=new car(); Truck e3=new Truck(); e1.getwheels(wheels); e1.getweight(weight); e2.getloader(loader); e3.getpayload(payload); e1.measge(wheels,weight); e2.measge(loader); e3.measge(payload); }}原文：https://www.cnblogs.com/chensihao/p/10877614.html