Use string length to compare empty string variables


Severity:  High

Rule:  The String.equals() method is overkill to test for an empty string. It is quicker to test if the length of the string is 0.

Reason:  The String.equals() method is overkill to test for an empty string. It is quicker to test if the length of the string is 0.

Usage Example: 
package com.rule;
class Use_String_length_to_compare_empty_string_violation
{
 public boolean isEmpty(String str)
 {
  return str.equals("");  // VIOLATION
 }
}
Should be written as:
package com.rule;
class Use_String_length_to_compare_empty_string_correction
{
 public boolean isEmpty(String str)
 {
  return str.length()==0;  // CORRECTION
 }
}

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