public static void main(String[] args) {

        String str = "01123425243319";
        StringBuilder sb = new StringBuilder();
        for(int i=0;i<str.length();i++)
        {
            if(i!=0 && i%2==0)
                sb.append(",");
            sb.append(str.charAt(i));
        }
        
        System.out.println(sb.toString());

    }

------解决方案--------------------

试过的喔~完全OK

记得结贴呀~~

代码如下：

public static void main(String[] args) {
		// TODO Auto-generated method stub
      String aa="01123425243319";
      String newStr="";
      for(int i=0;i<aa.length();i++){
   	   if(i==0||i%2==0){
   		   newStr=newStr+aa.substring(i,i+2)+",";
   		   System.out.println(newStr);
   	   }
   	  
      }

	}

------解决方案--------------------

Java code

public static void main(String[] args) {
        String startStr = "011234252433193";
        String endStr = "" ;
        if(startStr.length()%2!=0){
            for(int i=0;i<startStr.length()-1;i++){
                if(i%2==0){
                    endStr += startStr.substring(i, i+2)+",";
                }
                if(i==startStr.length()-2){
                    endStr += startStr.substring(startStr.length()-1, startStr.length());
                }
            }
        }else{
            for(int i=0;i<startStr.length()-1;i++){
                if(i%2==0){
                    endStr += startStr.substring(i, i+2)+",";
                }
            }
            endStr = endStr.substring(0, endStr.length()-1);
        }
        System.out.println(endStr);
    }