java Java多级中断
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Java multi-level break
提问by themaestro
I have a construct where I have a forloop nested inside of a whileloop in Java. Is there a way to call a breakstatement such that it exits both the forloop and the whileloop?
我有一个构造，其中我有一个for嵌套while在 Java 循环中的循环。有没有办法调用一个break语句，使它既退出for循环又退出while循环？
回答by Guido Anselmi
You can use a 'labeled' break for this.
您可以为此使用“标记”中断。
class BreakWithLabelDemo {
public static void main(String[] args) {
int[][] arrayOfInts = { { 32, 87, 3, 589 },
{ 12, 1076, 2000, 8 },
{ 622, 127, 77, 955 }
};
int searchfor = 12;
int i;
int j = 0;
boolean foundIt = false;
search:
for (i = 0; i < arrayOfInts.length; i++) {
for (j = 0; j < arrayOfInts[i].length; j++) {
if (arrayOfInts[i][j] == searchfor) {
foundIt = true;
break search;
}
}
}
if (foundIt) {
System.out.println("Found " + searchfor +
" at " + i + ", " + j);
} else {
System.out.println(searchfor
+ " not in the array");
}
}
}
}
Taken from: http://download.oracle.com/javase/tutorial/java/nutsandbolts/branch.html
取自：http: //download.oracle.com/javase/tutorial/java/nutsandbolts/branch.html
回答by lukastymo
You can do it in 3 ways:
您可以通过 3 种方式进行操作：
- You can have while and for loops inside method, and then just call
return - You can break for-loop and set some flag which will cause exit in while-loop
- Use label (example below)
- 您可以在方法内部使用 while 和 for 循环，然后调用
return - 您可以中断 for 循环并设置一些标志，这将导致在 while 循环中退出
- 使用标签（以下示例）
This is example for 3rd way (with label):
这是第三种方式的示例（带标签）：
public void someMethod() {
// ...
search:
for (i = 0; i < arrayOfInts.length; i++) {
for (j = 0; j < arrayOfInts[i].length; j++) {
if (arrayOfInts[i][j] == searchfor) {
foundIt = true;
break search;
}
}
}
}
example from this site
这个网站的例子
In my opinion 1st and 2nd solution is elegant. Some programmers don't like labels.
在我看来，第一个和第二个解决方案很优雅。有些程序员不喜欢标签。
回答by T.K.
For example:
例如：
out:
while(someCondition) {
for(int i = 0; i < someInteger; i++) {
if (someOtherCondition)
break out;
}
}
回答by korymiller
You should able to use a label for the outer loop (while in this case)
您应该能够为外循环使用标签（在这种情况下）
So something like
所以像
label:
While()
{
for()
{
break label;
}
}
回答by Jean-Bernard Pellerin
Make the loop be inside a function call and return from the function?
使循环在函数调用中并从函数返回？
