java命令行如何编译运行带package（包）的程序

先用javac编译，带参数-d

javac -d . ****.java

 然后，在当前目录下（不要到****子目录），运行java即可。

java ***.*****

如：

javac -d . FuctionDemo2.java

java com.FuctionDemo2

package com;


import java.util.function.Function;
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);
    }
}

示例来源：JAVA中Function的使用 - phpwyl - 博客园 (cnblogs.com)