Java 拼接字符的两个方法

1. 用StringUtils.join()

publict class test{
    List strList = new ArraryList();
    strList.add("abc");
    strList.add(" def");
    String str = "";
    str = StringUtils.join(strList,"|"); //第二个参数是分隔符，如果传入空字符串，则将strList中的每个元素直接相连
    System.out.println(str);
}

2.  用Stringbuilder
public class test{
StringBuilder sb = new StringBuilder();
        sb.append("abc");
        sb.append(" def");
        System.out.println(sb);
}