Java标签用法 [英] Java Label usage

问题描述

通过java好文章，我发现这样的代码完美编译。

Somewhere going through java good articles, I found that such code compiles perfectly.

public int myMethod(){
    http://www.google.com
    return 1;
}

说明 http： word将被视为标签， // www.google.com 作为评论

description says that http: word will be treated as label and //www.google.com as comment

我没有得到Java Label如何在循环外使用？
在什么情况下应该使用Java Label外部循环？

I am not getting how Java Label is useful outside loop? Under what situation Java Label outside loop should be used?

推荐答案

以下是在Java中使用标签的一个好处：

Here is one benefit of using labels in Java:

block:
{
    // some code

    if(condition) break block;

    // rest of code that won't be executed if condition is true
}

嵌套循环的另一种用法：

Another usage with nested-loops:

outterLoop: for(int i = 0; i < 10; i++)
{
    while(condition)
    {
        // some code

        if(someConditon) break outterLoop; // break the for-loop
        if(anotherConditon) break; // break the while-loop

        // another code
    }

    // more code
}

或：

outterLoop: for(int i = 0; i < 10; i++)
{
    while(condition)
    {
        // some code

        if(someConditon) continue outterLoop; // go to the next iteration of the for-loop
        if(anotherConditon) continue; // go to the next iteration of the while-loop

        // another code
    }

    // more code
}

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