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Commit 5409ac0

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从一个多层嵌套循环中直接退出
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‎README.md

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* [如何遍历map对象](https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/iterate-through-a-hashmap.md)
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* [public,protected,private,不加修饰符。有什么区别呢?](https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/in-java-whats-the-difference-between-public-default-protected-and-private.md)
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* [如何判断数组Array是否包含指定的值?](https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/in-java-whats-the-difference-between-public-default-protected-and-private.md)
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* [重写(Override)equlas和hashCode方法时应考虑的问题](https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/what-issues-should-be-considered-when-overriding-equals-and-hashcode-in-java.md)
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* [从一个多层嵌套循环中直接退出](https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/breaking-out-of-nested-loops-in-java.md)
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> 代码规范
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- [Converting String to int in Java?](http://stackoverflow.com/questions/5585779/converting-string-to-int-in-java)
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- [Is there a unique Android device ID?](http://stackoverflow.com/questions/2785485/is-there-a-unique-android-device-id)
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- [How to test a class that has private methods, fields or inner classes](http://stackoverflow.com/questions/34571/how-to-test-a-class-that-has-private-methods-fields-or-inner-classes)
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- [Why does this code using random strings print "hello world"?](http://stackoverflow.com/questions/15182496/why-does-this-code-using-random-strings-print-hello-world)
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- [How can I create an executable jar with dependencies using Maven?](http://stackoverflow.com/questions/574594/how-can-i-create-an-executable-jar-with-dependencies-using-maven)
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- [How to avoid Java code in JSP files?](http://stackoverflow.com/questions/3177733/how-to-avoid-java-code-in-jsp-files)
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- [In Java, how can I test if an Array contains a certain value?](http://stackoverflow.com/questions/1128723/in-java-how-can-i-test-if-an-array-contains-a-certain-value)
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- [Why is executing Java code in comments with certain Unicode characters allowed?](http://stackoverflow.com/questions/30727515/why-is-executing-java-code-in-comments-with-certain-unicode-characters-allowed)
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- [Dealing with "java.lang.OutOfMemoryError: PermGen space" error](http://stackoverflow.com/questions/88235/dealing-with-java-lang-outofmemoryerror-permgen-space-error)
@@ -58,7 +57,6 @@ stackoverflow-Java-top-qa
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- [Android SDK installation doesn't find JDK](http://stackoverflow.com/questions/4382178/android-sdk-installation-doesnt-find-jdk)
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- [How do I call one constructor from another in Java?](http://stackoverflow.com/questions/285177/how-do-i-call-one-constructor-from-another-in-java)
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- [Initialization of an ArrayList in one line](http://stackoverflow.com/questions/1005073/initialization-of-an-arraylist-in-one-line)
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- [Breaking out of nested loops in Java](http://stackoverflow.com/questions/886955/breaking-out-of-nested-loops-in-java)
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- [Java inner class and static nested class](http://stackoverflow.com/questions/70324/java-inner-class-and-static-nested-class)
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- ['Must Override a Superclass Method' Errors after importing a project into Eclipse](http://stackoverflow.com/questions/1678122/must-override-a-superclass-method-errors-after-importing-a-project-into-eclips)
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- [How do I compare strings in Java?](http://stackoverflow.com/questions/513832/how-do-i-compare-strings-in-java)
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- [How to concatenate two arrays in Java?](http://stackoverflow.com/questions/80476/how-to-concatenate-two-arrays-in-java)
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- [What's the simplest way to print a Java array?](http://stackoverflow.com/questions/409784/whats-the-simplest-way-to-print-a-java-array)
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- [Why can't I switch on a String?](http://stackoverflow.com/questions/338206/why-cant-i-switch-on-a-string)
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- [What issues should be considered when overriding equals and hashCode in Java?](http://stackoverflow.com/questions/27581/what-issues-should-be-considered-when-overriding-equals-and-hashcode-in-java)
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- [What issues should be considered when overriding equals and
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-
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-
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- [How to create a Java String from the contents of a file?](http://stackoverflow.com/questions/326390/how-to-create-a-java-string-from-the-contents-of-a-file)
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- [Why does Java have transient variables?](http://stackoverflow.com/questions/910374/why-does-java-have-transient-variables)
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- [How can I convert a stack trace to a string?](http://stackoverflow.com/questions/1149703/how-can-i-convert-a-stack-trace-to-a-string)
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##从一个多层嵌套循环中直接退出
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###问题
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Java中如何从一个多层嵌套循环中退出,例如下面,有两个循环,break只能退出一个for循环,不能直接跳过第二个for循环
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```java
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for (Type type : types) {
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for (Type t : types2) {
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if (some condition) {
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// Do something and break...
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break; // 这样只退出了最里的for循环
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}
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}}
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```
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###回答
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可以用brea+label的语法,例子如下
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```java
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public class Test {
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public static void main(String[] args) {
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outerloop:
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for (int i=0; i < 5; i++) {
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for (int j=0; j < 5; j++) {
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if (i * j > 6) {
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System.out.println("Breaking");
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break outerloop;
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}
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System.out.println(i + " " + j);
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}
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}
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System.out.println("Done");
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}
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}
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```
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首先在for循环前加标签,如例子中的outerloop,然后在for循环内break label(如本例的outerloop),就会跳出该label指定的for循环。
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stackoverflow链接:
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http://stackoverflow.com/questions/886955/breaking-out-of-nested-loops-in-java

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