Android(Java) 字符串的常用操作，获取指定字符出现的次数，根据指定字符截取字符串

/*这是第100000份数据，要截取出100000*/

String s="这是第100000份数据";
 String s1 = s.substring(s.indexOf("第") + 1, s.indexOf("份"));

 

/*判断指定字符出现了几次*/

    public static int countStr(String str, char key) {
        int count = 0;
        for (int i = 0; i < str.length(); i++) {
            if (str.charAt(i) == key)
                count++;
        }
        return count == 0 ? -1 : count;
    }

/*根据指定字符截取字符串存入到数组中*/

private static String[] stringToArray(String str, String key) {
        String[] temp = null;
        temp = str.split(key);
        return temp;
    }

MainText.java

public static void main(String[] args) {
		 String str = "abc;abck;abc";
//		 System.out.println(countStr(str, ';'));
	        String [] temp = null; 
	        temp=stringToArray(str, ";");
	        for (int i = 0; i < temp.length; i++) {
				System.out.println(temp[i]);
			}

	}