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如何从循环外部访问在嵌套循环中声明或初始化的数组或变量？

[英]How do you access an array or variable declared or initialized in a nested loop from outside of the loop?

原文 2012-04-09 02:14:36 4 2 java/ arrays/ string/ loops/ nested

How do you access an array or variable declared or initialized in a nested loop from outside of the loop?如何从循环外部访问在嵌套循环中声明或初始化的数组或变量？

2 个解决方案

You cannot.你不能。 You must declare the array outside the loop.您必须在循环外声明数组。 This may seem strange at first but what if the condition for the loop to run even once is never met?乍一看这似乎很奇怪，但如果循环运行一次的条件从未满足怎么办？ How could you possibly then access an array which was never even created?那么你怎么可能访问一个从未创建过的数组呢？

You cannot.你不能。 Java uses block scope, so variables declared within any block (such as a loop) are not accessible from outside. Java 使用块 scope，因此无法从外部访问任何块（例如循环）内声明的变量。 You'll need to assign them to something that has an outer scope.您需要将它们分配给具有外部 scope 的对象。

如何在while循环内初始化数组并在外部定义它？ - How do you initialize an array inside a while loop and define it outside?

如何使用我在其循环外初始化的变量？ - How can I use the variable I initialized outside its loop?

Java-从外部访问在循环内部声明的变量 - Java - accessing variable declared inside loop from outside of it

if-else中的嵌套do-while循环：变量未初始化 - Nested do-while loop in if-else: variable not initialized

我在 if 循环之前声明了我的变量，但我无法在循环之外访问它？ - I declared my variable before the if-loop but I can't access it outside of the loop?

在 For 循环外部声明的变量与在内部声明的变量 - Variable Declared Outside of For Loop Vs Inside

更改已在循环外声明的变量 - changing a variable that has been declared outside of a loop

如何在Java中的for循环外访问字符串变量？ - How to access the string variable outside the for loop in java?

在循环内声明的数组无法在循环外识别 - An array declared within the loop is not recognised outside it

如何在循环内或循环外访问整个double数组 - How to access whole double array in or outside loop

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相关问题 如何在while循环内初始化数组并在外部定义它？ - How do you initialize an array inside a while loop and define it outside? 如何使用我在其循环外初始化的变量？ - How can I use the variable I initialized outside its loop? Java-从外部访问在循环内部声明的变量 - Java - accessing variable declared inside loop from outside of it if-else中的嵌套do-while循环：变量未初始化 - Nested do-while loop in if-else: variable not initialized 我在 if 循环之前声明了我的变量，但我无法在循环之外访问它？ - I declared my variable before the if-loop but I can't access it outside of the loop? 在 For 循环外部声明的变量与在内部声明的变量 - Variable Declared Outside of For Loop Vs Inside 更改已在循环外声明的变量 - changing a variable that has been declared outside of a loop 如何在Java中的for循环外访问字符串变量？ - How to access the string variable outside the for loop in java? 在循环内声明的数组无法在循环外识别 - An array declared within the loop is not recognised outside it 如何在循环内或循环外访问整个double数组 - How to access whole double array in or outside loop

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