错误:字段名称不能声明为静态 [英] Error: field name cannot be declared static

问题描述

public class Application {
    public static void main(String[] args) {
        final class Constants {
            public static String name = "globe";
        }
        Thread thread = new Thread(new Runnable() {
            @Override
            public void run() {
                System.out.println(Constants.name);
            }
        });
        thread.start();
    }
}

编译错误:The field name cannot be declared static in a non-static inner type, unless initialized with a constant expression

解决方案?

推荐答案

Java不允许您在函数局部内部类内定义非最终静态字段.仅顶级类和静态嵌套类允许具有非最终静态字段.

Java does not let you define non-final static fields inside function-local inner classes. Only top-level classes and static nested classes are allowed to have non-final static fields.

如果要在Constants类中使用static字段，请将其放在Application类级别，如下所示:

If you want a static field in your Constants class, put it at the Application class level, like this:

public class Application {
    static final class Constants {
        public static String name = "globe";
    }
    public static void main(String[] args) {
        Thread thread = new Thread(new Runnable() {
            @Override
            public void run() {
                System.out.println(Constants.name);
            }
        });
        thread.start();
    }
}

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