android,java判断密码强度

上代码：

package com.example.passwordbig;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;

public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
//		setPassword("1212AAAFvv11414123");
		System.out.println(checkPassword("112~,.2Qwww321"));
	}

	private void setPassword(String str) {
		if (str.matches("^\\d+$")) {
			System.out.println("数字弱");
		} else if (str.matches("^[a-zA-Z]+$")) {
			System.out.println("字母弱");
		} else if (str
				.matches("(?i)^((\\d+[\\da-z]*[a-z]+)|([a-z]+[\\da-z]*\\d+)|([a-z]+[\\da-z]*[a-z]*)|(\\d+[\\da-z]*\\d*))$")) {
			System.out.println("密码强");
		} else {
			System.out.println("你不按套路出牌啊。你滴承诺尼，你滴担架尼？");
		}
	}
	
		/**
		 * 密码强度
		 * 
		 * @return Z = 字母 S = 数字 T = 特殊字符
		 */
		public String checkPassword(String passwordStr) {
			String regexZ = "\\d*";
			String regexS = "[a-zA-Z]+";
			String regexT = "\\W+$";
			String regexZT = "\\D*";
			String regexST = "[\\d\\W]*";
			String regexZS = "\\w*";
			String regexZST = "[\\w\\W]*";

			if (passwordStr.matches(regexZ)) {
				return "弱";
			}
			if (passwordStr.matches(regexS)) {
				return "弱";
			}
			if (passwordStr.matches(regexT)) {
				return "弱";
			}
			if (passwordStr.matches(regexZT)) {
				return "中";
			}
			if (passwordStr.matches(regexST)) {
				return "中";
			}
			if (passwordStr.matches(regexZS)) {
				return "中";
			}
			if (passwordStr.matches(regexZST)) {
				return "强";
			}
			return passwordStr;

	}
	
}