输出List<String>的内容，重写toString方法

import java.util.ArrayList; import java.util.List; public class ListToString { public static void main(String[] args) { List<String> hello = new ArrayList(); hello.add("adsfasd"); hello.add("adsfasd"); hello.add("adsfasd"); hello.add("adsfasd"); System.out.println(new ListToString().toString(hello));//这里通过对象调用 } public String toString(List<String> list) { StringBuilder strback = new StringBuilder(); for(String obj: list) { strback.append(obj); } return strback.toString(); } }