java编程题：java计算字符串中子串出现的次数

编程题：计算字符串中子串出现的次数，如“abcdefghijkabcopqrstabc”中“abc”子串出现的次数是3。

public static void main(String[] args) {
    
            String string = "abcdefgabcqwerabc,abc";
    
            String result = solution(string);
    
            System.out.println(result);
    
        }
    
        public static String solution(String value){
    
            String [] string = value.split("\,");
    
            String allString = string[0];
    
            String targetString = string[1];
    
            int count = 0;
    
            int i = 0;
    
            while(true){
    
                int index = allString.indexOf(targetString);
    
                if(index == -1){
    
                    break;
    
                }else{
    
                    allString = allString.substring(index+targetString.length(),allString.length());
    
                    count++;
    
                }
    
            }
    
            return String.valueOf(count);
    
        }