Java-导入主类时如何使用方法中的变量 [英] Java - How to use a variable from a method when imported into the main class

问题描述

我正在尝试使用主要部分中另一个类中创建的方法中的变量.

I am trying to use a variable from a method I created in another class in the main section.

例如:

public class test {

public static int n;

public void getLower(){

    int p = 12;
}


public static void main(String[] args) {

    test example = new test();

    example.getLower();

    System.out.println(p);



}

}

但是，我收到错误消息"p无法解析为变量".

However, I get the error message 'p cannot be resolved to a variable'.

我想做的是可能的吗?

提前谢谢！

推荐答案

p是getLower方法中的 local 变量.您不是在导入"方法，而是在调用它.该方法返回后，该变量甚至不再存在.

p is a local variable within the getLower method. You're not "importing" the method - you're just calling it. When the method has returned, the variable no longer even exists.

您可以考虑从方法中返回p的值:

You could consider returning the value of p from the method:

public int getLower() {
    int p = 12;
    // Do whatever you want here
    return p;
}

然后将返回值分配给main中的局部变量:

Then assign the return value to a local variable in main:

int result = example.getLower();
System.out.println(result);

您应该阅读有关变量的Java教程以了解更多信息有关各种变量的信息.

You should read the Java tutorial on variables for more information about the different kinds of variables.

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