[Java] 编程思想 - 内部类

创建内部类

public class Parcel1 {
    class Contents {
        private int i = 11;
        public int value() {
            return i;
        }
    }
    static class Destination {
        private String label;
        Destination(String whereTo) {
            label = whereTo;
        }
        String readLabel() {
            return label;
        }
    }
    public void ship(String dest) {
        Contents contents = new Contents();
        Destination d = new Destination(dest);
        System.out.println(d.readLabel());
    }

    public static void main(String[] args) {
        Parcel1 p = new Parcel1();
        p.ship("Tasmania");
    }
}

.this 的使用方式

public class DotThis {
    void f() {
        System.out.println("DotThis.f()");
    }
    public class Inner {
        public DotThis outer() {
            return DotThis.this;
        }
    }
    public Inner inner() {
        return new Inner();
    }

    public static void main(String[] args) {
        DotThis dt = new DotThis();
        DotThis.Inner dti = dt.inner();
        dti.outer().f();
    }
}