判断密码中必须含有大写字母，小写字母，数字和特殊字符，至少三种

private static boolean getMatch(String str){
        int count=0;
        Pattern p1 = Pattern.compile("[A-Z]");
         if(p1.matcher(str).find()){
            count++;
        }
        Pattern p2 = Pattern.compile("[a-z]");
        if(p2.matcher(str).find()){
            count++;
        }
        Pattern p3 = Pattern.compile("[0-9]");
        if(p3.matcher(str).find()){
            count++;
        }
        Pattern p4 = Pattern.compile("[^a-zA-Z0-9]");
        if(p4.matcher(str).find()){
            count++;
        }
        if(count>=3){
            return false;
        }else{
            return true;
        }
    }