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Quick Java Problem

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  • 26-03-2009 7:41pm
    #1
    Whackhead
    Closed Accounts Posts: 20 ✭


    I am recieving input from the user, and then I want to check if they actually entered anything:

    String searchValue = JOptionPane.showInputDialog(this, "Enter the node value you are looking for");


    //Check that the user entered something
    if(searchValue != "")
    {

    But that if statement returns true even if I leave the text box empty. What am I doing wrong?

    Cheers


Comments

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    #2
    aidan_walsh
    Closed Accounts Posts: 17,208 ✭✭✭✭aidan_walsh


    You are comparing Objects, not strings. Looks into the String equals method.


  • Options
    #3
    Whackhead
    Closed Accounts Posts: 20 ✭Whackhead


    aidan_walsh wrote: »
    You are comparing Objects, not strings. Looks into the String equals method.

    Cheers, had forgotten about that.


  • Options
    #4
    sicruise
    Registered Users Posts: 378 ✭✭sicruise


    You can also use the apache commons StringUtils method isNotEmpty

    Will work better and will avoid NPE's


  • Options
    #5
    Hobbes
    Registered Users Posts: 21,264 ✭✭✭✭Hobbes


    sicruise wrote: »
    You can also use the apache commons StringUtils method isNotEmpty

    Why pull in a whole library for 1 line of code?

    s != null && !s.equals("")


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