Java ¼Ì³ÐСÀý

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/**
* ShowExtending
* ÑÝʾ¼Ì³ÐʱµÄÏÖÏó
*/
class SupCls {
static String s1 = "¸¸ÀàÀà±äÁ¿s1";
String s2 = "¸¸ÀàʵÀý±äÁ¿s2";
SupCls(){
System.out.println("¸¸À๹ÔìÆ÷±»·ÃÎÊ");
}
public static void f1(){
System.out.println("¸¸Àà static:f1() ±»·ÃÎÊ");
}
public void f2(){
System.out.println("¸¸Àà instance:f2() ±»·ÃÎÊ");
}
}
public class ShowExtending extends SupCls {
static String s1 = "×ÓÀàÀà±äÁ¿s1";
String s2 = "×ÓÀàʵÀý±äÁ¿s2";
ShowExtending(){
// ϵͳ»áµ÷Óø¸ÀàµÄĬÈÏ£¨Ã»ÓвÎÊý£©¹¹ÔìÆ÷
// Èç¹û¸¸ÀàĬÈϹ¹ÔìÆ÷±»¸²¸ÇÒÔÖÂûÓÐÎ޲ι¹ÔìÆ÷£¬Ôò±àÒë³ö´í
// ´ËʱӦ¸Ãµ÷Óà super( /*²ÎÊý*/ ); ÏÔʾµ÷Óø¸À๹ÔìÆ÷
System.out.println("×ÓÀ๹ÔìÆ÷±»·ÃÎÊ");
}
public static void f1(){
System.out.println("×ÓÀà static:f1() ±»·ÃÎÊ");
}
public void f2(){
System.out.println("×ÓÀà instance:f2() ±»·ÃÎÊ");
}
public static void main(String[] args) {
// ´´½¨×ÓÀà¶ÔÏóʱ»á´´½¨¸¸Àà¶ÔÏ󣬻áµ÷Óø¸À๹ÔìÆ÷
SupCls a = new SupCls();
ShowExtending b = new ShowExtending();
SupCls c = b;
// ²âÊÔͨ¹ý²»Í¬·½Ê½·ÃÎʸ¸ÀàºÍ×ÓÀàµÄÊý¾Ý³ÉÔ±
System.out.println("a.s1£º" + a.s1);
System.out.println("a.s2£º" + a.s2);
System.out.println("b.s1£º" + b.s1);
System.out.println("b.s2£º" + b.s2);
System.out.println("c.s1£º" + c.s1);
System.out.println("c.s2£º" + c.s2);
// ²âÊÔͨ¹ý²»Í¬·½Ê½·ÃÎʸ¸ÀàºÍ×ÓÀàµÄ·½·¨³ÉÔ±
System.out.print("a.f1():");
a.f1();
System.out.print("a.f2():");
a.f2();
System.out.print("b.f1():");
b.f1();
System.out.print("b.f2():");
b.f2();