java：是否可以为Buttons数组设置lambda表达式是for循环？如果是这样的话？ [英] java: Is it possible to set a lambda expression for an array of Buttons is a for loop? If so how?

问题描述

我希望能够做到这样的事情：

I want to be able to do something like this:

for(i = 0; i < 10; i++) {
    //if any button in the array is pressed, disable it.
    button[i].setOnAction( ae -> { button[i].setDisable(true) } );
}

但是，我收到错误说局部变量从lambda表达式引用必须是final或者有效的final 。我怎么还能像上面的代码那样做（如果可能的话）？如果无法完成，应该做些什么来获得类似的结果？

However, I get a error saying "local variables referenced from a lambda expression must be final or effectively final". How might I still do something like the code above (if it is even possible)? If it can't be done, what should be done instead to get a similar result?

推荐答案

如错误信息所示，从lambda表达式引用的局部变量必须是final或者有效的final（有效的final意味着编译器可以让它最终为你）。

As the error message says, local variables referenced from a lambda expression must be final or effectively final ("effectively final" meaning the compiler can make it final for you).

简单的解决方法：

for(i = 0; i < 10; i++) {
    final int ii = i;
    button[i].setOnAction( ae -> { button[ii].setDisable(true) } );
}

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