java判断是否boolean Java判断是否为字母

package cn.edu.hpu;

import java.util.Scanner;

public class BoBo {

	/**
	 * @zhj
	 */
	public static void main(String[] args) {
	
		Scanner scanner =new Scanner(System.in);
		System.out.println("请输入：");
		String s1 = scanner .next();
        char cs[] = s1.toCharArray();
        String str2="";
        for(int i=0;i<s1.length();i++)
        {
        	
                if(Character.isUpperCase(cs[i]))
              {
                  System.out.println("第"+(i+1)+"个字符是大写字母");
               }else if(Character.isLowerCase(cs[i]))
                {
            	   System.out.println("第"+(i+1)+"个字符是小写字母");
                }else if(Character.isDigit(cs[i]))
                {
                	System.out.println("第"+(i+1)+"个字符是数字");
                }else if(19968 <= cs[i] &&cs[i] <40623)
                {
                	System.out.println("第"+(i+1)+"个字符是中文");
                }
                	
        }
            
       
        
	}
}