Java internal class use

public class TestInner {
    public void ti(){
        System.out.println("TestInner.ti");
    }

    class TestInnerSon {
        public void tis(){
            System.out.println("TestInnerSon.tis");
        }

        public void fatherFun(){
            //创建外部类引用
            TestInner ti = TestInner.this;
            ti.ti();
        }
    }

    public static void main(String[] args) {
        //创建内部类引用
        TestInner testInner = new TestInner();
        TestInnerSon testInnerSon = testInner.new TestInnerSon();
        testInnerSon.fatherFun();
        testInnerSon.tis();
    }
}

1. Create an external class using the external class name .this, such as: TestInner ti = TestInner.this;
2. Create an internal class reference using the external class instance. New internal class name, such as: TestInnerSon testInnerSon = new TestInner().new TestInnerSon();