public class NewTest {

     public static void main(String[] args) {

         N<Integer> n1 = new N<Integer>(1) {

             @Override

             void handler() {

                 System.out.println("这个是数字:" + this.getContent());

             }

         };

         n1.handler();

         var n2 = new N<String>("这个是字符串，用var定义临时变量哦") {

             @Override

             void handler() {

                 System.out.println("这个是字符串文本哦:" + this.getContent());

             }

         };

         n2.handler();

         /*我可以匿名哦,JDK9支持哦*/

         N<?> n3 = new N<>("object") {

             @Override

             void handler() {

                 System.out.println("object:"+this.getContent());

             }

         };

         n3.handler();

     }

 }

 abstract class N<T> {

     private T content;

     public N(T content) {

         this.content = content;

     }

     public T getContent() {

         return content;

     }

     public void setContent(T content) {

         this.content = content;

     }

     abstract void handler();

 }