computer 版 (精华区)
发信人: arbo (arbo), 信区: program
标 题: java上课笔记1
发信站: 听涛站 (2001年09月17日10:40:30 星期一), 站内信件
发信人: airforce1 (五湖废人), 信区: Java
标 题: java上课笔记1
发信站: BBS 水木清华站 (Sat Apr 1 11:26:59 2000)
随手写些老师讲的东西,不难。
static ,
class A{
static int i=5;
static { System.out.println("staticc code i="+i++);}
}
public class test{
public static void main(String args[]){
System.out.println("main code: i="+ A.i);
}
}
the result:
static code: i=5;
Main code : i=6
"static block" executes just once. (a constructor will execute when
every time the object is newed.)
final keyword.
you can not extend a class from a final class.
another thing is , in c/c++, use const to declare a variable is not writeable.
in java, final variable is a constant.
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※ 来源:·听涛站 tingtao.dhs.org·[FROM: 匿名天使的家]
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