java字符串简单操作

1、找出字符串中包含另一个字符或者字符串的个数

   static int charNum(String str,char ch) {
        int count = 0;
        for(int i=0;i<str.length();i++){
        	if (str.charAt(i)== ch) {
        		count++;
        	}
        }
		return count;
	 }

	  static int strNum(String str,String s) {
	        int count = 0;
	        int index =str.indexOf(s);
	        while(index!=-1){
	          count++;
              str=str.substring(index+s.length());
              System.out.println(str);
              index=str.indexOf(s);

	        }
			return count;
		}

2、把一个字符串中某个字符都去掉

static String squeezeOut(String from, char toss){
   char[ ] chars = from.toCharArray();
   int len = chars.length;
   int put = 0;
   for(int i=0; i<len;i++){
     if(chars[i] != toss)
       char[put++] = chars[i];
   }
  return new String(chars,0,put);
}