java,内部类

有成员内部类，静态内部类，匿名内部类，局部内部类

成员内部类

public class OuterClass {
    private String name;
    private static String desc;
    class InnerClass{
        //成员内部类中不能存在 静态属性和方法
        static final int id=0;
        void tell(){
            System.out.println(name+desc);
        }
    }
    public  InnerClass getInnerClass(){
        return new InnerClass();
    }
    public static void main(String[] args) {
        OuterClass out=new OuterClass();
        InnerClass inn=out.new InnerClass();
        inn.tell();
    }
}

静态内部类

public class OuterClass2 {
    private String name;
    private static String  desc;
    static class InnerClass{
        //静态内部类只能访问外部类的静态方法
        private static int id;
        private static void syso() {
            System.out.println(desc);
        }
        private void tell() {
            System.out.println(desc);
        }
    }
    public static void main(String[] args) {
        OuterClass2 out=new OuterClass2();
        OuterClass2.InnerClass.syso();
    }
}