Zi 字媒體

[Java 教學範例拷貝]- 擴充（extends）父類別(2/2)   剛才找資料時發現一個的Java 教學網站，趕快發揮(C/P)的長才將它備份來，有需要的同好，歡迎來(C/P)一下^^。   拷貝來源：http://openhome.cc/Gossip/JavaGossip-V1/ http://openhome.cc/Gossip/JavaGossip-V1/ExtendParentClass.htm   public class Point2D { private int x, y; public Point2D() {x = 0; y = 0;} public Point2D(int x, int y) {this.x = x; this.y = y;} public int getX() {return x;} public int getY() {return y;} public void setX(int x) {this.x = x;} public void setY(int y) {this.y = y;} }   public class Point3D extends Point2D { // 繼承Point2D類別 private int z; // 新增私用資料 public Point3D() { z = 0; } // 建構函式，同時指定呼叫父類別建構函式 Point3D(int x, int y, int z) { super(x, y); this.z = z; } // 新增函式 public int getZ() {return z;}; public void setZ(int z) {this.z = z;} }   public class UseExtend { public static void main(String[] args) { Point3D p1 = new Point3D(1, 3, 4); Point3D p2 = new Point3D(); System.out.printf("p1: (%d, %d, %d) \n", p1.getX(), p1.getY(), p1.getZ()); p2.setX(2); p2.setY(4); p2.setZ(6); System.out.printf("p2: (%d, %d, %d) \n", p2.getX(), p2.getY(), p2.getZ()); } }