Login Form help me please

[TheHyng]

If you are experiencing an issue please mention the full platform your issue applies to:
IDE: NetBeans/Eclipse/IDEA
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Hi guys, so I have a problem in my code, so I'm starting some kind of login form and I wan't to check if the textfield is empty or not before adding the values to the variables but when I added the new if :

if (username.getText()==null || username.getText().trim().isEmpty())

I got this build output:

ant -f "G:\\Codename One\\CodenameOne" -Dnb.internal.action.name=rebuild clean jar

No GUI Entries available

init:

deps-clean:

Updating property file: G:\Codename One\CodenameOne\build\built-clean.properties

Deleting directory G:\Codename One\CodenameOne\build

refresh-libs:

Deleting directory G:\Codename One\CodenameOne\lib\impl

clean:

No GUI Entries available

init:

deps-jar:

Created dir: G:\Codename One\CodenameOne\build

Updating property file: G:\Codename One\CodenameOne\build\built-jar.properties

Created dir: G:\Codename One\CodenameOne\build\classes

Compile is forcing compliance to the supported API's/features for maximum device compatibility. This allows smaller

        code size and wider device support

Created dir: G:\Codename One\CodenameOne\build\tmp

Compiling 1 source file to G:\Codename One\CodenameOne\build\tmp

G:\Codename One\CodenameOne\src\com\mycompany\myapp\mainclassZ.java:103: error: cannot find symbol

                if (username.getText()==null || username.getText().trim().isEmpty()){

  symbol:   method isEmpty()

  location: class String

1 error

G:\Codename One\CodenameOne\build.xml:57: Compile failed; see the compiler error output for details.

BUILD FAILED (total time: 2 seconds)

So this is the code of my login form:

Form login = new Form("Login");

        setBackCommand(login);

        TextField username = new TextField("","Username", 20, TextField.INITIAL_CAPS_WORD);

        TextField password = new TextField("", "Password", 20, TextField.PASSWORD);

        Button userlogin = new Button("Login");

        

        userlogin.addActionListener(new ActionListener(){

            @Override

            public void actionPerformed(ActionEvent evt){

                if (logged==false){                    

                if (username.getText()==null || username.getText().trim().isEmpty()){

                    Dialog.show("Warning!", "Please, fill all the fields!", "Ok","Cancel");

                }                    

                else{

                    //How do I add the textfield content to the variables user1 and pass1?

                    Dialog.show("Logged in!", "Log in successful! Welcome "+user1+"!", "Ok", "Close Dialog");

                    logged=true;

                    user1=username.getText();

                    pass1=password.getText();

                }                

                }

                else

                    Dialog.show("Warning!", "You are already logged into an account please log out first!","Ok", "Cancel");

            }            

        }); 

[Steve Hannah]

Currently String.isEmpty() is not included in our base JRE.   You can see the supported API in the javadocs:

https://www.codenameone.com/javadoc/java/lang/String.html

Missing string methods generally have an alternative.  In this case use  username.getText().trim().length() == 0.

Some other utility methods can be found in the StringUtil class.

https://www.codenameone.com/javadoc/com/codename1/util/StringUtil.html

Steve

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Steve Hannah

Software Developer

Codename One

http://www.codenameone.com