java解压缩算法的简单字符串处理

public class Solution {
    
    public static String compress (String str) {

        // write code here
        //1.定义返回结果，组装的变量（计算左边字符；计算右边字符；计算结果）
        String result = "";
        String optStr="";
        String optLeftStr="";
        String optRightStr="";

        //2.定义本次计算的临时变量，
        String optTemp = "";
        String cycle = "";
        String optNumberStr="";
        //3.计算中间的字符串
        //寻找第一个]的位置
        int optRightPoint=str.indexOf("]");
        optTemp = str.substring(0,optRightPoint);
        int optPoint = optTemp.lastIndexOf("|");

        int optPointLeft = optTemp.lastIndexOf("[");
        optLeftStr = optTemp.substring(0,optPointLeft);
        optRightStr = str.substring(optRightPoint+1,str.length());
        optNumberStr = optTemp.substring(optPointLeft+1,optPoint);

        cycle = optTemp.substring(optPoint+1,optRightPoint);
        int cycleTimes = Integer.valueOf(optNumberStr);
        for(int i =0 ;i < cycleTimes;i++){
            optStr = optStr + cycle;
        }
        result= optLeftStr +optStr +optRightStr;
        System.out.print("-->"+result);
        if(result.contains("]")){
            compress(result);
        }
        return result;
    }

    public static void main(String[] args) {
        String input = "HG[3|B[2|CA]]F";
        System.out.print(input);
        Solution.compress(input);
//        String str =  "123456";
//        int point = str.indexOf("3");//0开头
//        String subString = str.substring(1,6);
//        System.out.println(subString);
    }
}