running a desktop application from another java application

Question

With the help of Netbeans, I made a Java desktop application. I just made another class in that package where I just added a button. I meant it for the purpose of running Java desktop application which I made earlier. When searched for the main method of appview.java (only this contains a main) there was code like this:

public static void main(String[] args) {
    launch(SRECOApp.class, args);
}

I tried to put launch(SRECOApp.class, args); in the action listener of the button, but it didn't work. Please, what should I do now?

So if I understand correctly you want to achieve this behaviour: 1. Application launches and a window with a button appears 2. The click on the button launches the main app - maybe this answer can help stackoverflow.com/a/15681589/1212463 — lmazgon
– lmazgon, Commented Dec 2, 2014 at 18:09
exactly but the link you posted have nothing like that.please see the code I written over there — user4165262
– user4165262, Commented Dec 2, 2014 at 18:18
What I meant with that answer is, that you should create a new Stage object and open the second application. I assume you have two Application objects in your code - if you have only one, then this is the answer you are looking for stackoverflow.com/a/20967174/1212463 — lmazgon
– lmazgon, Commented Dec 2, 2014 at 18:26

lvr123 · Accepted Answer · 2014-12-16 09:10:51Z

0

This is what the Desktop class and the Runtime class are meant for.

Desktop class is more to open an application associated to a file (via its file extension).

Runtime class is more to open an application and passing parameters to this application.

Eg:

Runtime.getRuntime().exec("notepad.exe")

edited Dec 16, 2014 at 9:10

answered Dec 16, 2014 at 9:05

lvr123

5847 silver badges31 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Ouroborus · Accepted Answer · 2024-02-03 23:55:21Z

// Java program to create a simple calculator
// with basic +, -, /, * using java swing elements
 

import java.awt.event.*;
import javax.swing.*;
import java.awt.*;
class calculator extends JFrame implements ActionListener {
    // create a frame
    static JFrame f;

    // create a textfield
    static JTextField l;

    // store operator and operands
    String s0, s1, s2;

    // default constructor
    calculator()
    {
        s0 = s1 = s2 = "";
    }

    // main function
    public static void main(String args[])
    {
        // create a frame
        f = new JFrame("calculator");

        try {
            // set look and feel
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        }
        catch (Exception e) {
            System.err.println(e.getMessage());
        }

        // create a object of class
        calculator c = new calculator();

        // create a textfield
        l = new JTextField(16);

        // set the textfield to non editable
        l.setEditable(false);

        // create number buttons and some operators
        JButton b0, b1, b2, b3, b4, b5, b6, b7, b8, b9, ba, bs, bd, bm, be, beq, beq1;

        // create number buttons
        b0 = new JButton("0");
        b1 = new JButton("1");
        b2 = new JButton("2");
        b3 = new JButton("3");
        b4 = new JButton("4");
        b5 = new JButton("5");
        b6 = new JButton("6");
        b7 = new JButton("7");
        b8 = new JButton("8");
        b9 = new JButton("9");

        // equals button
        beq1 = new JButton("=");

        // create operator buttons
        ba = new JButton("+");
        bs = new JButton("-");
        bd = new JButton("/");
        bm = new JButton("*");
        beq = new JButton("C");

        // create . button
        be = new JButton(".");

        // create a panel
        JPanel p = new JPanel();

        // add action listeners
        bm.addActionListener(c);
        bd.addActionListener(c);
        bs.addActionListener(c);
        ba.addActionListener(c);
        b9.addActionListener(c);
        b8.addActionListener(c);
        b7.addActionListener(c);
        b6.addActionListener(c);
        b5.addActionListener(c);
        b4.addActionListener(c);
        b3.addActionListener(c);
        b2.addActionListener(c);
        b1.addActionListener(c);
        b0.addActionListener(c);
        be.addActionListener(c);
        beq.addActionListener(c);
        beq1.addActionListener(c);

        // add elements to panel
        p.add(l);
        p.add(ba);
        p.add(b1);
        p.add(b2);
        p.add(b3);
        p.add(bs);
        p.add(b4);
        p.add(b5);
        p.add(b6);
        p.add(bm);
        p.add(b7);
        p.add(b8);
        p.add(b9);
        p.add(bd);
        p.add(be);
        p.add(b0);
        p.add(beq);
        p.add(beq1);

        // set Background of panel
        p.setBackground(Color.blue);

        // add panel to frame
        f.add(p);

        f.setSize(200, 220);
        f.show();
    }

    public void actionPerformed(ActionEvent e)
    {
        String s = e.getActionCommand();

        // if the value is a number
        if ((s.charAt(0) >= '0' && s.charAt(0) <= '9') || s.charAt(0) == '.') {
            // if operand is present then add to second no
            if (!s1.equals(""))
                s2 = s2 + s;
            else
                s0 = s0 + s;

            // set the value of text
            l.setText(s0 + s1 + s2);
        }
        else if (s.charAt(0) == 'C') {
            // clear the one letter
            s0 = s1 = s2 = "";

            // set the value of text
            l.setText(s0 + s1 + s2);
        }
        else if (s.charAt(0) == '=') {
            double te;

            // store the value in 1st
            if (s1.equals("+"))
                te = (Double.parseDouble(s0) + Double.parseDouble(s2));
            else if (s1.equals("-"))
                te = (Double.parseDouble(s0) - Double.parseDouble(s2));
            else if (s1.equals("/"))
                te = (Double.parseDouble(s0) / Double.parseDouble(s2));
            else
                te = (Double.parseDouble(s0) * Double.parseDouble(s2));

            // set the value of text
            l.setText(s0 + s1 + s2 + "=" + te);

            // convert it to string
            s0 = Double.toString(te);

            s1 = s2 = "";
        }
        else {
            // if there was no operand
            if (s1.equals("") || s2.equals(""))
                s1 = s;
            // else evaluate
            else {
                double te;

                // store the value in 1st
                if (s1.equals("+"))
                    te = (Double.parseDouble(s0) + Double.parseDouble(s2));
                else if (s1.equals("-"))
                    te = (Double.parseDouble(s0) - Double.parseDouble(s2));
                else if (s1.equals("/"))
                    te = (Double.parseDouble(s0) / Double.parseDouble(s2));
                else
                    te = (Double.parseDouble(s0) * Double.parseDouble(s2));

                // convert it to string
                s0 = Double.toString(te);

                // place the operator
                s1 = s;

                // make the operand blank
                s2 = "";
            }

            // set the value of text
            l.setText(s0 + s1 + s2);
        }
    }

Collectives™ on Stack Overflow

running a desktop application from another java application

2 Answers 2

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related