java8

package com.wpx.demo01;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.function.Consumer;
import java.util.function.Function;
import java.util.function.Predicate;
import java.util.function.Supplier;
import org.junit.Test;

/**
 * java 8 -_-新特性 四大内置核心函数式接口
 * @author wangpx 
 *	有去无回  consumer
 
    void accept(T t)  //消费式
 *	自食其力   Supplier
  
    T get(); //供给式 * 抛砖引玉 Function
   
     R apply(T t); //函数式 * 是是非非 Predicate
    
      boolean(T t); //断言式 */ public class Test01 { //有去无回 Consumer @Test public void test01() { youquwuhui(20, (r) -> System.out.println(r+"个肉包子有去无回")); } public void youquwuhui(Integer num,Consumer
     
       con) { con.accept(num); } //自食其力 Supplier @Test public void test02() { List
      
        list=youlaiyouqu(365, () -> "是不是又白过一天"); System.out.println("白活"+list.stream().count()+"天"); } //赚多少,花多少,钱包扁的刚刚好 public List
       
         youlaiyouqu(Integer day,Supplier
        
          s) { List
         
           list=new ArrayList
          
           (); for (int i=0;i
           
             str.substring(3, 4)); System.out.println(yu); } public String paozhuanyinyu(String str,Function
            
              fun) { return fun.apply(str); } //是是非非 Predicate @Test public void test04() { List
             
               r=shishifeifei(Arrays.asList("是","是","非","非"),(e)-> e.equals("是") ); for (String string : r) { System.out.println(string); } } public List
              
                shishifeifei(List
               
                 list,Predicate
                
                  p){ List
                 
                   isList=new ArrayList
                  
                   (); for (String string : list) { if(p.test(string)) { isList.add(string); } } return isList; } }