Think in java读书笔记

crazyIT · 发表于 2003-8-1 17:54

I have read the seventh just now,
and decide to stop learning next chapter about a week,
and start to exercise from one to seven so that master it

davidsk · 发表于 2003-8-2 01:48

最初由 yining 发布
[B]

看不懂。不过，每一种语言都有它的长处和短处，没有一种语言是万能的。 [/B]

Indeed, however, I think most people use java for network programming. Of course, that is its advantage.

yafeng · 发表于 2003-8-3 21:27

找到了侯捷的翻译，偶不翻了。

flyx · 发表于 2003-8-6 09:46

tij上的例子，看看下面的程序输出结果是什么
偶觉得这个例子很不错

class Insect {
  int i = 9;
  int j;
  Insect() {
prt("i = " + i + ", j = " + j);
j = 39;
  }
  static int x1 =
prt("static Insect.x1 initialized"

;
  static int prt(String s) {
System.out.println(s);
return 47;
  }
}

public class Beetle extends Insect {
  int k = prt("Beetle.k initialized"

;
  Beetle() {
prt("k = " + k);
prt("j = " + j);
  }
  static int x2 =
prt("static Beetle.x2 initialized"

;
public static void main(String[] args) {
prt("Beetle constructor"

;
Beetle b = new Beetle();
}
}

答案
static Insect.x1 initialized
static Beetle.x2 initialized
Beetle constructor
i = 9, j = 0
Beetle.k initialized
k = 47
j = 39

flyx · 发表于 2003-8-6 11:39

原文：
With a primitive, final makes the value a constant, but with an object reference, final makes the reference a constant.

用final修饰原声类型(primitive type)变量，变量的值为常量
修饰对象类型(object reference)变量，变量的索引(reference)为常量，即存储地址不变，存储的值(value)可变