Java内部类和静态内部类初始化层面的区别

Java

和static修饰的其他内容一样，静态内部类代表它是属于类本身的，而内部类则是属于类的实例的
具体见下面注释里吧
举例

public class OuterClass {
    private InnerClass innerClass = new InnerClass();
    private InnerClass innerClass2 = new OuterClass().new InnerClass();
    private static InnerClass innerClass3 = new OuterClass().new InnerClass();
    private static StaticInnerClass staticInnerClass = new StaticInnerClass();
    // 和静态变量or方法一样，静态内部类是没法被实例调用的
    private StaticInnerClass staticInnerClass2 = new OuterClass.StaticInnerClass();
    public void fun1() {
        InnerClass innerClass = new InnerClass();
        InnerClass innerClass2 = new OuterClass().new InnerClass();
        StaticInnerClass staticInnerClass = new StaticInnerClass();
    }
    public static void fun2() {
        // InnerClass innerClass = new InnerClass(); 静态方法里内部类没法直接new出来
        // 必须先实例化外部类，再用外部类的实例new出来
        InnerClass innerClass2 = new OuterClass().new InnerClass();
        StaticInnerClass staticInnerClass = new StaticInnerClass();
    }
    public class InnerClass {
    }
    public static class StaticInnerClass {
    }
}

这和静态方法里没法调用非静态变量，非静态变量没法赋值静态变量应该是一样的