CODEWITHSUNDEEP
javastring
Saral Saxena
Saral Saxena

Reputation: 121

trimming a string plus checking if string is not empty

I have an array list in which objects are stored, and from those object's getters I get string value as shown below 

List<abcd> hgfer = (List<abcd>)Getter.rows(jhfile);
            for(abcd f: hgfer)
            {           
            String p = f.getFromArea()

As shown above the array list and the values that I am extracting. Now I have to make sure that the string that I am getting is not empty plus it should be trimmed, I achieved this as shown below:

p.getFromArea().trim().length() > 0

Now there are several getters attached to this object which will return a string. For every individual string I have to do this. I was thinking to make a separate individual method which will return a boolean value and a string parameter will be pass.For ex:

 private String validaterow(String g)
  {
  boolean valid = false;'
  try{
  **//code to check that should not be empty plus it should be trim one** 
  }
  catch(){}
  valid = false;  
  }

and I have to make a call to this method somewhere within the class

List<abcd> hgfer = (List<abcd>)Getter.rows(jhfile);
            for(abcd f: hgfer)
            {           
             if (!validaterow(f.getFromArea())
           {//customised message 
           }
           else
           continue;

Now please advise how could I achieve that string should not be empty plus it should be trim one

Upvotes: 0

Views: 607

Answers (6)

Deepak
Deepak

Reputation: 327

Use StringUtils class from apache.commons.lang

 If (StringUtils.isNotBlank(yourString)){

      isValid = true;
 }

This will trim the yourString and check for null or blank value.

Upvotes: 0

Martin Seeler
Martin Seeler

Reputation: 6982

According to Apache Commons, you could use theire method to check, if a string is empty or not.

/**
* <p>Checks if a String is whitespace, empty ("") or null.</p>
*
* <pre>
* StringUtils.isBlank(null)      = true
* StringUtils.isBlank("")        = true
* StringUtils.isBlank(" ")       = true
* StringUtils.isBlank("bob")     = false
* StringUtils.isBlank("  bob  ") = false
* </pre>
*
* @param str  the String to check, may be null
* @return <code>true</code> if the String is null, empty or whitespace
* @since 2.0
*/
public static boolean isBlank(String str) {
  int strLen;
  if (str == null || (strLen = str.length()) == 0) {
    return true;
  }
  for (int i = 0; i < strLen; i++) {
    if ((Character.isWhitespace(str.charAt(i)) == false)) {
      return false;
    }
  }
  return true;
}

The reason for this way is demonstrated in this example:

System.out.println(Character.isWhitespace('c'));   // false
System.out.println(Character.isWhitespace(' '));   // true
System.out.println(Character.isWhitespace('\n'));  // true
System.out.println(Character.isWhitespace('\t'));  // true

Upvotes: 1

user1369311
user1369311

Reputation:

Try this:

private boolean validaterow(String g){
boolean isValid = false;
if(g.trim().isEmpty()){
    isValid = true;
}
return isValid;

}

If the parameter String is not empty the method will return false.

Upvotes: 0

Zaheer Ahmed
Zaheer Ahmed

Reputation: 28558

try this:

  private boolean validaterow(String text)
  {     
   try{
      return (text == null) || (text != null && text.trim().length() == 0);
    }
   catch(){}
      return false;  
    }
  }

Upvotes: 0

Vineet Singla
Vineet Singla

Reputation: 1677

 boolean validateNullString(String str)
    {
        return (str == null || str.trim().length() == 0);

    }

This will validate your String object against null and empty.

Upvotes: 0

Rahul
Rahul

Reputation: 45070

You can try something like this:-

public boolean isNullOrEmpty(String str) {
    return (str == null) || (str.trim().length() == 0);
}

This will return true if your String is null or empty, else false.

Upvotes: 1

Related Questions