Inner class basic operations

/**
 * Copyright (C), 2017，jumore Tec.
 * Author: hechengwen
 * Version:
 * Date: 2018/5/4 9:23
 * Description:
 * Others:
 */
public class HashMapTest {

    private static String _name = "xiaohe";
    public int _age = 25;

    public static void main(String[] args) throws Exception {
        new HashMapTest().display();
    }

    private static void outerClass(){
        System.out.println( "I am an external class static method" );
    }

    /**
     * static inner class
     */ 
    static  class InnerClass1{
         public  static String name = "xiaosan" ;
         public  void dispaly(){
             // The static inner class can directly access the static variables of the outer class, even if it is private, it cannot access non-static member variables and methods 
            System. out.println("inner class1 : " + _name);
            outerClass();
        }
    }

    /**
     * non-static inner class
     */ 
    class InnerClass2{
         // Non-static inner class, cannot define static members 
        public String name = "xiaosi" ;
         public  void display(){
             // Non-static inner class can directly access any member of the outer class 
            System.out.println( "inner class2 : " + _name + " , age : " + _age);
        }
    }

    public void display(){
        System.out.println( "The outer class can directly access the static inner class variable: " + InnerClass1.name);

        // The outer class can create objects directly through the new inner class, without relying on the outer class instance 
        new InnerClass1().dispaly();

        // Create a non-static inner class instance: outer class. inner class a = new outer class().new inner class(); 
        HashMapTest.InnerClass2 innerClass2 = new HashMapTest(). new InnerClass2 ();
        innerClass2.display();
    }

}