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OO question.

jam

发贴: 79
积分: 30

于 2003-06-17 16:30

class A {
int i = 1;
int f() {
return i;
}
static char g() {
return 'A';
}
}

class B extends A {
int i = 2;
int f() {
return -i; // ----- -i not -1 , sorry
}
static char g() {
return 'B';
}
}

public class Test {
public static void main(String args[]) {
B b = new B();
A a = (A) b;
System.out.println(a.i); // 1 ------------ can use ? to explain
System.out.println(a.f()); // -2 ------------ can use 'polymorphism' to explain
System.out.println(a.g()); // A ------------ can use ? to explain
System.out.println(A.g()); // A ------------- can use 'static' to explain
}
}

I had been post before. I was uncertain of reason.

jam edited on 2003-06-17 18:44

话题树型展开

人气	标题	作者	字数	发贴时间
3397	OO question.	jam	672	2003-06-17 16:30
2576	Re:OO question.	qindf	35	2003-06-17 17:23
2693	Re:OO question.	samx	64	2003-06-17 18:06
2602	Re:OO question.	jam	135	2003-06-17 18:45
2948	Re:OO question.	archonLing	118	2003-06-18 09:27

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