用户名和密码的校验

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package safe;

public class Check {

// 要求：输入的用户名不得少于6位，最所为15位，且为数字字母和下滑线，首字符不能是数字和下滑线
public boolean user_nameCheckSafe(String user_name) {

boolean flag = true;

if ((user_name.length() > 15 || user_name.length() < 6)) {

flag = false;

   System.out.println("6--15位之间");
  }
  if (flag == true) {

if (!((user_name.charAt(0) >= 'a' && user_name.charAt(0) <= 'z') || (user_name
.charAt(0) >= 'A' && user_name.charAt(0) <= 'Z'))) {

flag = false;

System.out.println("开始字符错误只能为字母");

}
}

if (flag == true) {
for (int i = 1; i < user_name.length(); i++) {

    if (!(user_name.charAt(i) >= 'a' && user_name.charAt(i) <= 'z')
      && !(user_name.charAt(i) >= 'A' && user_name.charAt(i) <= 'Z')
      && !(user_name.charAt(i) == '_')
      && !(Character.getNumericValue(user_name.charAt(i)) >= 0 && Character
        .getNumericValue(user_name.charAt(i)) < 10)) {
     flag = false;
     System.out.println("数字字母下划线");
     break;

}

}
}

return flag;

}

public boolean user_passCheckSafe(String user_pass) {

boolean flag = true;

if ((user_pass.length() > 15 || user_pass.length() < 6)) {

flag = false;

System.out.println("6--15位之间");
}

if (flag == true) {
for (int i = 1; i < user_pass.length(); i++) {

    if (!(user_pass.charAt(i) >= 'a' && user_pass.charAt(i) <= 'z')
      && !(user_pass.charAt(i) >= 'A' && user_pass.charAt(i) <= 'Z')
      && !(Character.getNumericValue(user_pass.charAt(i)) >= 0 && Character
        .getNumericValue(user_pass.charAt(i)) < 10)) {
     flag = false;
     System.out.println("数字字母");
     break;

}

}
}

return flag;

}

/**
* @param args
*/
public static void main(String[] args) {

  Check c = new Check();
  boolean flag;
  flag = c.user_passCheckSafe("19840711");
  System.out.println(flag);
}

}