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Thread: Action Methods..

  1. #1
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    Default Action Methods..

    Hello all. So i creating Calculator and i have a problem. First see my code :
    import java.awt.*;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
     
    import javax.swing.*;
     
     
    public class Salutine extends JFrame {
     
    	//Numbers
     
    	private JButton nulis;
    	private JButton vienas;
    	private JButton du;
    	private JButton trys;
    	private JButton keturi;
    	private JButton penki;
    	private JButton sesi;
    	private JButton septyni;
    	private JButton astuoni;
    	private JButton devyni;
    	private JTextField atsakymas;
     
     
     
    	//Operators
     
    	private JButton dalyba,daugyba,pridetis,atimtis;
     
    	//Constructor
     
    	public Salutine() {
    		super("Skaiciuotuvas By xkendzu (Beta)");
    		setLayout(new FlowLayout());
     
     
    		nulis = new JButton("0");
    		vienas = new JButton("1");
    		du = new JButton("2");
    		trys = new JButton("3");
    		keturi = new JButton("4");
    		penki = new JButton("5");
    		sesi = new JButton("6");
    		septyni = new JButton("7");
    		astuoni = new JButton("8");
    		devyni = new JButton("9");
     
     
     
    		dalyba = new JButton("/");
    		daugyba = new JButton("*");
    		pridetis = new JButton("+");
    		atimtis = new JButton("-");
     
     
     
    		atsakymas = new JTextField("",20);
     
     
     
    		add(nulis);
    		add(vienas);
    		add(du);
    		add(trys);
    		add(keturi);
    		add(penki);
    		add(sesi);
    		add(septyni);
    		add(astuoni);
    		add(devyni);
    		add(nulis);
    		add(atsakymas);
     
     
    		add(dalyba);
    		add(daugyba);
    		add(pridetis);
    		add(atimtis);
     
    		//Creating, when button pressing
     
     
    		Skaiciai skaiciai = new Skaiciai();
    		nulis.addActionListener(skaiciai);
    		vienas.addActionListener(skaiciai);
    		du.addActionListener(skaiciai);
    		trys.addActionListener(skaiciai);
    		keturi.addActionListener(skaiciai);
    		penki.addActionListener(skaiciai);
    		sesi.addActionListener(skaiciai);
    		septyni.addActionListener(skaiciai);
    		astuoni.addActionListener(skaiciai);
    		devyni.addActionListener(skaiciai);
     
    		Veiksmai veiksmai = new Veiksmai();
    		dalyba.addActionListener(veiksmai);
    		daugyba.addActionListener(veiksmai);
    		pridetis.addActionListener(veiksmai);
    		atimtis.addActionListener(veiksmai);
     
    	}
     
    	//Number class with method
     
    	public class Skaiciai implements ActionListener {
     
    		public void actionPerformed(ActionEvent e) {
    			String nr1 = e.getActionCommand();
    			String nr2 = e.getActionCommand();
     
    			int nr11 = Integer.parseInt(nr1);
    			int nr22 = Integer.parseInt(nr2);
     
     
     
     
    		}
     
     
     
    	}
     
    	//Operator class with method
     
    	public class Veiksmai implements ActionListener {
     
    		public void actionPerformed(ActionEvent e1) {
     
    			String op = e1.getActionCommand();
     
     
    		}
     
     
     
     
    	}
     
     
     
     
     
    }

    So when you pressed button of number, JTextField change text like 1 and when you pressed operator changed text to 1 +-/* and finally when you pressed last number change text to 1 +-/* 2 = 3.. So i need know how post variables with value in the next actionPerformed method. Maybe my code bad? Maybe I must using other method? Can you help me? Thanks..


  2. #2
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    Default Re: Action Methods..

    You can do what you describe in the existing actionPerformed() method. For example, you could set the TextField to the button pressed with the statement:

    atsakymas.setText( nr1 );

    You can then build on that using a StringBuilder object perhaps to which the operator and subsequent buttons could be added.

  3. #3
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    Default Re: Action Methods..

    Can you tell me more about String builder?

  4. #4
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    Default Re: Action Methods..

    Anytime you need to know more about a Java core or SE class, simply Google, 'java class doc' where 'class' = the name of the class you're interested in. For example, for StringBuilder, Google 'java stringbuilder doc'. Using that formula, the top result will normally be the desired page.

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