Lambad expression in Java

Lambad expression

1. Runnable good-bad.
2. Lambda written in comparison with other writing (160dd5c670a2fe key ).

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Lambda expression:

Lambda is an anonymous function, Lambda is a code that can introduce and be more flexible . It was Java8 (note the version).

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Runnable code

Normally everyone has to start a thread. Do you have java.lang.Runnable interface, and then use the java.lang.Thread class to start the thread. (Yes, I tried it!)

//匿名内部类写法
public class Demo02{
  public static void main(String []args){
   //    匿名内部类
      Runnable tack  = new Runnable(){
          // 重写run 方法
          @Override
          public void run(){ 
              System.out.println("多线程启动对象");
          }
      };

//      隐名线程 搭配 start
      new Thread(tack).start();

};
 

   }
}

code analysis

Runnable anonymous internal class writing can analyze several contents:

​ 1.Thread requires Runnable interface as a parameter, and the abstract run method is the core of the thread task content.

​ 2. In order to run method body, to need Runnable interface implementation class. And must cover run method, all names, parameters, method return value, to rewritten again 160dd5c670af93

​ 3. In order to save the trouble of RunnableImpl to use an anonymous internal for

Summary: It seems that the method body is the key. So we have to export a better way to write Lambda

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Lambda is better written

Lambda is better written
With the new grammar of Java 8, the Runnable interface can be expressed by simpler Lambda expressions.

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Standard syntax:

(parameter type parameter name) -> {code statement}

x () -> System.out.println("Multi-threaded task execution!")

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How to use Lambda

//     Lambda 表达式使用方法
      new Thread(() -> System.out.println("Lambda表达式")).start();