Java随机获取32位密码且必须包含大小写字母、数字和特殊字符，四种的任意三种详解编程语言

import java.util.Random; 
 
public class GetRandomPwd{ 
     
    /** 
     * @Title: getRandomPwd 
     * @Description:获取制定长度的密码，包含大小写字母、数字和特殊字符，四种的任意三种 
     * @param len 
     * @return String 
     * @throws 
     */ 
    public static String getRandomPwd(int len) { 
        String result = null; 
        while(len==32){ 
            result = makeRandomPwd(len); 
            if (result.matches(".*[a-z]{1,}.*") && result.matches(".*[A-Z]{1,}.*") && result.matches(".*//d{1,}.*") && result.matches(".*[~;<@#:>%^]{1,}.*")) { 
                return result; 
            }  
            result = makeRandomPwd(len); 
        } 
        return "长度不得少于32位!"; 
    } 
     
    /** 
     * @Title: makeRandomPwd 
     * @Description:随机密码生成 
     * @param len 
     * @return String 
     * @throws 
     */ 
    public static String makeRandomPwd(int len) { 
        char charr[] = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890~;<@#:>%^".toCharArray(); 
        StringBuilder sb = new StringBuilder(); 
        Random r = new Random(); 
        for (int x = 0; x < len; ++x) { 
            sb.append(charr[r.nextInt(charr.length)]); 
        } 
        return sb.toString(); 
    } 
     
     
    public static void main(String[] args) { 
        String password = getRandomPwd(32); 
        System.out.println(">>>:"+password); 
    } 
}