从全局变量访问父级的内部类

public class OuterClass {
    private int outerVariable = 10;
    
    public class InnerClass {
        private int innerVariable = 20;
    }
    
    public static void main(String[] args) {
        OuterClass outer = new OuterClass();
        OuterClass.InnerClass inner = outer.new InnerClass();
        
        System.out.println(inner.innerVariable); // 访问内部类的成员变量
        System.out.println(outer.outerVariable); // 访问外部类的成员变量
    }
}