Java新特性解读JDK8之自定义Lambda接口编程

package com.example.lambdademo.customInterfaces;
@FunctionalInterface
public interface LambdaNoReturnNoParameter {
  void test();
}


package com.example.lambdademo.customInterfaces;
@FunctionalInterface
public interface LambdaNoReturnSingleParameter {
  void test(int a);
}


package com.example.lambdademo.customInterfaces;
@FunctionalInterface
public interface LambdaNoReturnMultipleParameter {
  void test(int a,int b);
}
package com.example.lambdademo.customInterfaces;
@FunctionalInterface
public interface LambdaHaveReturnNoParameter {
  int test();
}


package com.example.lambdademo.customInterfaces;
@FunctionalInterface
public interface LambdaHaveReturnSingleParameter {
  int test(int a);
}


package com.example.lambdademo.customInterfaces;
@FunctionalInterface
public interface LambdaHaveReturnMultipleParameter {
  int test(int a,int b);
}


package com.example.lambdademo.customInterfaces;
/**
 * 自定义Lambda接口测试使用
 * @author thehe
 *
 */
public class CustomInterfacesTest {
  
  public static void main(String[] args) {
    //无返回值无参数
    LambdaNoReturnNoParameter lambdaNoReturnNoParameter=()->{
      System.out.println("无返回值无参数");
    };
    lambdaNoReturnNoParameter.test();
    
    //无返回值单个参数
    LambdaNoReturnSingleParameter lambdaNoReturnSingleParameter =(int a)->{
      System.out.println("无返回值单个参数: "+a);
    };
    lambdaNoReturnSingleParameter.test(2);
    
    //无返回值多个参数
    LambdaNoReturnMultipleParameter lambdaNoReturnMultipleParameter=(int a,int b)->{
      System.out.println("无返回值多个参数: "+a+b);
    };
    lambdaNoReturnMultipleParameter.test(1, 2);
    
    //有返回值无参数
    LambdaHaveReturnNoParameter lambdaHaveReturnNoParameter=()->{
      System.out.println("有返回值无参数");
      return 6;
    };
    int test = lambdaHaveReturnNoParameter.test();  
    System.out.println("有返回值无参数"+test);
    
    //有返回值单个参数
    LambdaHaveReturnSingleParameter lambdaHaveReturnSingleParameter=(int a)->{
      System.out.println("有返回值单个参数");
      return a;
    };
    int test2 = lambdaHaveReturnSingleParameter.test(7);
    System.out.println("有返回值单个参数"+test2);
    
    //有返回值多个参数
    LambdaHaveReturnMultipleParameter lambdaHaveReturnMultipleParameter=(int a,int b)->{
      System.out.println("有返回值多个参数");
      return a+b;
    };
    int test3 = lambdaHaveReturnMultipleParameter.test(8, 9);
    System.out.println("有返回值多个参数"+test3);
    
    //简洁写法:参数类型，大括号，return ，在此省略
    LambdaHaveReturnMultipleParameter lambdaHaveReturnMultipleParameter2=(x,y)->x+y;
    lambdaHaveReturnMultipleParameter2.test(8, 9);
    System.out.println("有返回值多个参数的简洁写法: "+test3);
  }
}