java lambda表达式

package test;
public class LambdaDemo {
    interface Printer{
        void printer(String val);
    }
    public void printSomething(String something,Printer printer){
        printer.printer(something);
    }
    public static void main(String[]args){
        LambdaDemo lamdademo=new LambdaDemo();
        String some="lamda测试";

        Printer printer=new Printer(){
            public void printer(String val){
                System.out.println(val);
            }
        };
        lamdademo.printSomething(some,printer);
    }
}

初步简化

Printer printer =(String val)->{System.out.println(val);};
lamdademo.printSomething(some,printer);

接着简化

Printer printer = val->System.out.println(val);
lamdademo.printSomething(some,printer);

最终

lamdademo.printSomething(some,val->System.out.println(val));