内部类

Inner Class

public class Main {
    public static void main(String[] args) {
        Outer outer = new Outer("Nested");
        Outer.Inner inner = outer.new Inner();
        inner.hello();
    }
}
class Outer {
    private final String name;
    Outer(String name) {
        this.name = name;
    }
    class Inner {
        void hello() {
            System.out.println("Hello, " + Outer.this.name);
        }
    }
}

Anonymous Class匿名

public class Main {
    public static void main(String[] args) {
        Outer outer = new Outer("Nested");
        outer.asyncHello();
    }
}
class Outer {
    private final String name;
    public Outer(String name) {
        this.name = name;
    }
    void asyncHello() {
        Runnable r = new Runnable() {
            @Override
            public void run() {
                System.out.println("Hello," + Outer.this.name);
            }
        };
        new Thread(r).start();
    }
}

静态内部类

public class Main {
    public static void main(String[] args) {
        Outer.StaticNested sn = new Outer.StaticNested();
        sn.hello();
    }
}
class Outer {
    private static final String NAME = "OUTER";
    private final String name;
    public Outer(String name) {
        this.name = name;
    }
    static class StaticNested {
        void hello() {
            System.out.println("Hello" + Outer.NAME);
        }
    }
}