[Java 教學範例拷貝]- 擴充(extends)父類別(1/2)
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() {} public Point2D(int x, int y) {this.x = x; this.y = y;} public int getX() {return x;} public int getY() {return y;} }
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public class Point3D extends Point2D { // 擴充Point2D類別 private int z; // 新增私用資料 public Point3D() { super(); } // 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;} }
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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()); System.out.printf("p2: (%d, %d, %d) \n", p2.getX(), p2.getY(), p2.getZ()); } }
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