optimization - length() instead of equals() to check empty string in java -

is there difference in code optimization if use use length() instead of equals() check empty string in java??

public boolean isempty(string str) {     return str.equals("");        //never }  public boolean isempty(string str) {     return str.length()==0;        //correct way check empty } 

is true??

you can use str.isempty(), internally checks length.

here's implementation of string class :

public int length() {     return count; }  public boolean isempty() {    return count == 0; } 

you can see isempty() compares length 0.