import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * 康小岱
 * 檢測密碼的合法性
 * 規則說明： 
 * 1.密碼不能含有空格字串 
 * 2.密碼只能包括字母和數字
 * */
public class e {
	
	public static void main(String[] args) {
		String password = "我";
		if (true == isValid(password)) {
			System.out.println("合法密碼格式");
		} else {
			System.out.println("不合法密碼格式");
		}

	}

	public static boolean isValid(String password) {

		if (password.length() > 0) {
			//判斷是否有空格字串
			for (int t = 0; t < password.length(); t++) {
				String b = password.substring(t, t + 1);
				if (b.equals(" ")) {
					System.out.println("有空字串");
					return false;
				}
			}
			
			
			//判斷是否有漢字
		     int count = 0;    
	         String regEx = "[\\u4e00-\\u9fa5]";    
	         Pattern p = Pattern.compile(regEx);    
	         Matcher m = p.matcher(password);    
	        while (m.find()) {    
	            for (int i = 0; i <= m.groupCount(); i++) {    
	                 count = count + 1;    
	             }    
	         }
	       
	         if(count>0){
	        	 System.out.println("有漢字");
	        	 return false;
	         }
	         

	         //判斷是否是字母和數字
			int numberCounter = 0;
			for (int i = 0; i < password.length(); i++) {
				char c = password.charAt(i);
				if (!Character.isLetterOrDigit(c)) {
					return false;
				}
				if (Character.isDigit(c)) {
					numberCounter++;
				}
			}

		} else {
			return false;
		}
		return true;
	}
}