JAVA中Function的使用

package com;

import java.util.function.Function;

public class FuctionDemo {
    public static void main(String[] args) {
    convert("100",s -> Integer.parseInt(s),integer ->String.valueOf(integer+100));
    }
    private static void convert(String s, Function<String,Integer> fun1,Function<Integer,String> fun2){
//        Integer s1 = fun1.apply(s);
//        String s2 = fun2.apply(s1);
//        System.out.println(s2);
        String apply = fun1.andThen(fun2).apply(s);
        System.out.println(apply);
    }
}

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package com;   import java.util.function.Function;   /**  * 练习，String s  = "张三,30";  * 1，将字符串截取得到数字年龄部分  * 2，将上一步的年龄字符串转换成int类型数据  * 3，将上一步的int数据加70，得到一个int结果，在控制台输出  */ public class FuctionDemo2 {     public static void main(String[] args) {         convert("张三,30",s -> s.split(",")[1],Integer::parseInt,integer -> integer+70);         convert("张三,30",s -> Integer.parseInt(s.split(",")[1]),integer -> integer+70);         convert("张三,30",s -> Integer.parseInt(s.split(",")[1])+70);       }     public static void convert(String s, Function<String,String>fun1,Function<String ,Integer>fun2,Function<Integer,Integer>fun3){         Integer apply = fun1.andThen(fun2).andThen(fun3).apply(s);         System.out.println(apply);     }     public static void convert(String s, Function<String,Integer>fun1,Function<Integer ,Integer>fun2){         Integer apply = fun1.andThen(fun2).apply(s);         System.out.println(apply);     }     public static void convert(String s, Function<String,Integer>fun1){         Integer apply = fun1.apply(s);         System.out.println(apply);     } }