删除String中的前导括号和尾随括号

Question

在Java中,我想摆脱String中的前导括号和尾随括号.
给定输入:

"[ hello, char[]={a,b,c} ... bye ]"

我怎样才能产生输出

" hello, char[]={a,b,c} ... bye "

只删除了前导[和尾随]...我怎么能用Java做到这一点？

Answer 1

String i = "[ hello, char[]={a,b,c} ... bye ]";

int indexOfOpenBracket = i.indexOf("[");
int indexOfLastBracket = i.lastIndexOf("]");

System.out.println(i.substring(indexOfOpenBracket+1, indexOfLastBracket));

打印:

 hello, char[]={a,b,c} ... bye 

Answer 2

public class Test{
   public static void main(String[] args){
       String test = "[ abc ]";
       System.out.println(test.substring(1,test.length()-1));
       // Outputs " abc "
   }
}

Answer 3

String s = "[ hello, char[]={a,b,c} ... bye ]";
s = s.replaceAll("^\\[|\\]$", "");

如果有前导和/或尾随空格：

String s = "   [ hello, char[]={a,b,c} ... bye ] ";
s = s.trim().replaceAll("^\\[|\\]$", "");