package com;

public class JudgeChar {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		String str="123456";
		if (str.indexOf("3")>-1) {
			System.out.println("字符'3'存在");
		}
		else {
			System.out.println("字符'3'不存在");
		}

	}

}