JAVA获取五位随机数字组成的字符串

public static String get5NumString(){
	String result ="";
	char[] str = "0123456789".toCharArray();
	for(int i = 0; i < 5; i++) {
		int indexNumber = (int) (Math.random() * str.length);
		result += str[indexNumber];
	}
	return result;
}