java继承实例。

时间：2022-09-11 04:19:36

定义了一个点类point，然后线条类line继承了point类，正方形类Suare继承point类。

package test;

import javax.swing.*;

public class test {

    public static void main(String args[]){

        line AB = new line();

        System.out.println("AB的第一个坐标为:x="+AB.EGetx()+",y="+AB.EGety()+"."+"AB的第二个坐标为:x="+AB.EGetx()+",y="+AB.FGety()+".");

        Square ABCD = new Square();

        System.out.println("ABCD的第一个坐标为:"+ABCD.Get1x()+","+ABCD.Get1y()+"."

                            +"ABCD的第二个坐标为:x="+ABCD.Get2x()+","+ABCD.Get2y()+"."

                            +"ABCD的第三个坐标为:x="+ABCD.Get3x()+","+ABCD.Get3y()+"."

                            +"ABCD的第四个坐标为:x="+ABCD.Get4x()+","+ABCD.Get4y()+".");

    }

}

class point{

    private int x,y;

    static int pCount = 0;

    point(){x=10;y=20;pCount++;System.out.println("创建一个point，这个point为第："+pCount+"个.");}

    point(int x,int y){this.x=x;this.y=y;pCount++;System.out.println("创建一个point，这个point为第："+pCount+"个.");}

    static int GeipCount(){return pCount;}

    int Getx(){return x;}

    int Gety(){return y;}

}

class line extends point{

    static int lCount = 0;

    private    point E;

    private    point F;

    private float range;

    line()

    {

        E = new point();

        F = new point(1,2);

        range=1.5f;

        lCount++;

        System.out.println("创建一个line，这个line为第："+lCount+"个.");

    }

    line(point E,point F,float range)

    {

        this.E=E;

        this.F=F;

        this.range=range;

        lCount++;

        System.out.println("创建一个line，这个line为第："+lCount+"个.");

    }

    static int GeilCount(){return lCount;}

    int EGetx(){return E.Getx();}

    int EGety(){return E.Gety();}

    int FGetx(){return F.Getx();}

    int FGety(){return F.Gety();}

}

class Square extends point{

    private point A;

    private int range;

    static int sCount = 0;

    Square(){A = new point();range = 1;sCount++;System.out.println("创建一个Square，这个line为第："+sCount+"个.");}

    Square(point A){this.A = A;range = 1;sCount++;System.out.println("创建一个Square，这个line为第："+sCount+"个.");}

    Square(point A,int range){this.A = A;this.range = range;sCount++;System.out.println("创建一个Square，这个line为第："+sCount+"个.");}

    int Get1x(){return A.Getx();}

    int Get1y(){return A.Gety();}

    int Get2x(){return A.Getx()+range;}

    int Get2y(){return A.Gety();}

    int Get3x(){return A.Getx();}

    int Get3y(){return A.Gety()+range;}

    int Get4x(){return A.Getx()+range;}

    int Get4y(){return A.Gety()+range;}

}

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