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作者 Re:使用&&与||的疑惑问题!! [Re:1332185]
dracularking





发贴: 8
积分: 0
于 2006-06-22 11:39 user profilesend a private message to usersearch all posts byselect and copy to clipboard. 
ie only, sorry for netscape users:-)add this post to my favorite list
public class Application
{
static boolean b = true;
private static int j = 0;
public static boolean methodB(int k)
{
j += k;
return true;
}

public static void methodA(int i)
{
b = i > 10 | methodB(1);
b = i > 2 && methodB(4); //很迷惑的地方,&&为短路运算,不会执行“methodB(4)”,但程序运行结果确执行了。
} //使用“||”(同样为短路运算),但是它就不会执行“methodB(4)”.

public static void main(String args[])
{
methodA(5);
System.out.println(j + "," + b);
}
}


you see, you said && is a shortcut operator, so that the function methodB(4)'s supposed not to be executed...

IN FACT, it's a wrong conclusion, it's executed indeed AS the former expression

"i>2" (here i is 5) is true, so the shortcut operator wont be shortcutted.


dracularking edited on 2006-06-22 11:42


一个程序员的奋斗历程

话题树型展开
人气 标题 作者 字数 发贴时间
9227 使用&&与||的疑惑问题!! 1332185 534 2006-06-21 21:03
6888 Re:使用&&与||的疑惑问题!! jameszhang 19 2006-06-21 21:20
6742 Re:使用&&与||的疑惑问题!! why 91 2006-06-21 22:00
6832 Re:使用&&与||的疑惑问题!! lisliefor 147 2006-06-22 10:09
6991 Re:使用&&与||的疑惑问题!! dracularking 807 2006-06-22 11:39
7469 Re:使用&&与||的疑惑问题!! 1332185 9 2006-06-24 00:11

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