public class StringTest_2 {

    /**
     * @param args
     */
    public static void main(String[] args) {

        String str = "loveerlovetyloveuiloveoplove";
        String key = "love";
/*System.out.println("$$$$$$$$$$"+str.indexOf(key,0));
System.out.println(key.length());
System.out.println("$$$$$$$$$$"+str.indexOf(key,4));*/
        int count = getKeyStringCount_lp(str,key);
        System.out.println("count="+count);
                
    }

   public static int getKeyStringCount_lp(String str,String key){
       //定义key在字符串中出现的位置
       int index = 0;
       //定义计数器
       int count = 0;
       while((index=str.indexOf(key, index)) != -1){//找到了子串，返回子串的位置
           str = str.substring(index+key.length());//从剩余的子串当中继续找
        //System.out.println(str);//打印剩余的子串
           count++;//记录找到多少个子串
       }
    return count;
   }
}