Question

我正在使用Netbeans编写Java代码，当我要访问其他类中的数组时，必须将插入textField1中的输入（学生标记）存储到Array中（以计算平均值并将其设置为textfield2）。

我收到此错误"Cannot find Symbole variable:name_of_Array"，是否应该导入任何软件包，或者我做错了什么？感谢您的帮助！

Answer 1

不用看代码就不必说自己在做什么错。但是，这是执行此操作的一般方法。可以说您有两个这样的类：

class OtherClass{

    private int accessMe = 10;
    public int accessMe2 = 20;
    public static int accessMe4 = 50;

    public OtherClass(){

        int accessMe3 = 40;

    }

}

要访问OtherClass的变量，请执行以下操作：

class Access{

    public static void main(String args[]){

        OtherClass other = new OtherClass();            

        //this is not valid - because accessMe is declared as private in OtherClass
        //meaning you can only use/access accessMe variable inside the scope of OtherClass
        //If you had to access this variable, you would put a getter/setter in your OtherClass implementation.
        int accessMe = other.accessMe;

        //this is valid - because there is no particular restriction on accessMe2 inside OtherClass
        int accessMe2 = other.accessMe2;

        //this is not valid since accessMe3 is declared inside the local scope (which is the contructor of OtherClass)
        //You do not have access to accessMe3 except inside the constructor
        int accessMe3 = other.accessMe3;

        //this is valid since accessMe4 is a static variable
        int accessMe4 = OtherClass.accessMe4;

    }


}

如您所见，它在很大程度上取决于您声明数组的方式。您是否宣布为私有？上市？静态的？受保护？声明在哪里？该课程属于一个完全不同的项目吗？（在这种情况下，您必须导入）

此外，您可以将变量类型更改为示例中所需的任何类型。

Java数组操作

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