匿名内部类

匿名内部类

两种使用方法

• 接口

  public class main {
      public static void main(String[] args) {
          Runnable runnable = new Runnable() {
              @Override
              public void run() {
                  System.out.println("线程启动");
              }
          };
          Thread thread = new Thread(runnable);
          thread.start();
  
      }
  }
  

  或者更常见的

  public class main {
      public static void main(String[] args) {
       
          Thread thread = new Thread( new Runnable() {
              @Override
              public void run() {
                  System.out.println("线程启动");
              }
          });
          thread.start();
  
      }
  }
  

• 类

  任意的某个类

  class B {
  
      public void print() {
          System.out.println("B print");
      }
  }
  public class main {
      public static void main(String[] args) {
          B b = new B(){
              @Override
              public void print() {
                  System.out.println("匿名继承父类");
              }
          };
          b.print();
      }
  }
  
  

  相当于 匿名内部类继承了B