如何在Java中加载嵌套类？ [英] How to load nested classes in Java?

问题描述

我有以下java代码：

I have the following java code:

public class CheckInnerStatic {

private static class Test {
    static {
        System.out.println("Static block initialized");
    }
    public Test () {
        System.out.println("Constructor called");
    }
}

    public static void main (String[] args) throws ClassNotFoundException, InstantiationException, IllegalAccessException {
        System.out.println("Inside main");
        Class.forName("Test");    // Doesn't work, gives ClassNotFoundException
        //Test test = new Test();   // Works fine
    }
}

为什么不是 class.forName（Test）在下一行工作正常的时候在这里工作？

Why doesn't the class.forName("Test") work here while the next line works fine?

推荐答案

使用外部$嵌套（无论嵌套类是否为静态）

Use Outer$Nested (regardless if nested class is static or not)

public class CheckInnerStatic {

    private static class Test {
    static {
        System.out.println("Static block initialized");
    }
    public Test () {
        System.out.println("Constructor called");
    }
}

    public static void main (String[] args) throws ClassNotFoundException, InstantiationException, IllegalAccessException {
        System.out.println("Inside main");
        Class<?> cls = Class.forName("CheckInnerStatic$Test");
        //Test test = new Test();
    }
}

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