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Thread: Updating the interface

  1. #1
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    Default Updating the interface

    I want to creat simple aplication which if I click a button it will do something and the value would update on the interface , the value updates but not on the interface
    Code:
    public class baza {
    public static void main(String[] args)
    {derivat f=new derivat("titlu");
    	f.initializare();
    	f.show();
    }
    }
    import java.awt.*;
    import java.awt.event.*;
    public class derivat extends Frame implements ActionListener{
    	private int k=0,a=0;             //it's declaration
    	public derivat(String titlu){
    		super(titlu);
    	}
    	public void initializare(){
    		setLayout(new GridLayout(2,0));
    		setSize(900,900);
    		Panel x=new Panel();
    		x.setLayout(new FlowLayout());
    		Button b1=new Button("Stand1");
    		x.add(b1);
    		x.add(new Label("Standuri:"+k));        // where it is called in the code 
    		Button b2=new Button("Vanzare1");
    		x.add(b2);
    		add(x);
    		Panel y=new Panel();
    		y.setLayout(new FlowLayout());
    		Button b3=new Button("Stand2");
    		y.add(b3);
    		y.add(new Label("Standuri:"+a));
    		Button b4=new Button("Vanzare2");
    		y.add(b4);
    		add(y);
    		b1.addActionListener(this);
    		b2.addActionListener(this);
    		b3.addActionListener(this);
    		b4.addActionListener(this);
    		}
    	public void actionPerformed(ActionEvent e){
    		String command=e.getActionCommand();
    		if (command.equals("Stand1"))
    	++k;                                               // the value which I update but doesn't show on the interface
    	    else if(command.equals("Stand2"))
    			a++;
    	}
    }


    Please help


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Updating the interface

    Where does the code try to show the new value of the variable? After its value is changed, the GUI needs to be updated with the new value.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: Updating the interface

    Welcome to the forum! Thanks for taking the time to learn how to post code correctly. If you haven't already, please read this topic to learn other useful info for new members.

    You should be using Swing (JLabel) instead of AWT (Label).

    Look at the API for Label to review the methods that will help you do what you've described.

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