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POHow to find a button source in AWT (calculator homework)
 

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  1. POHow to find a button source in AWT (calculator homework)
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    <p>We were asked to make a simple GUI calculator, I used getSource() to detect the buttons, cause that's what they taught us. It works by typing the 1st and 2nd value then choosing the operation, it worked. But I made a mistake, because what they want us to do is that the numbers should also be buttons, just like a real calculator. so how do i get the value of each button using getSource()? like when I press button 1 and 2 is equal to 3. heres what ive done</p> <pre><code>import java.awt.*; import java.awt.event.*; public class SimpleCalculator implements ActionListener { // containers private Frame f; private Panel p1, p2, p3, p4; // components private Label l1, l2, l3; private TextField tf1, tf2, tf3; private Button bAdd, bSub, bMul, bDiv, bClear; public SimpleCalculator() { f = new Frame("My First GUI App"); p1 = new Panel(); p2 = new Panel(); p3 = new Panel(); p4 = new Panel(); l1 = new Label("First: "); l2 = new Label("Second: "); l3 = new Label("Result: "); tf1 = new TextField(15); tf2 = new TextField(15); tf3 = new TextField(15); bAdd = new Button("+"); bSub = new Button("-"); bMul = new Button("*"); bDiv = new Button("/"); bClear = new Button("C"); } public void launchFrame() { // use default layout manager of the Panel (FlowLayout) p1.add(l1); p1.add(tf1); p2.add(l2); p2.add(tf2); p3.add(l3); p3.add(tf3); p4.add(bAdd); p4.add(bSub); p4.add(bMul); p4.add(bDiv); p4.add(bClear); // change the layout manager of the Frame, // use GridLayout(4, 1) f.setLayout(new GridLayout(4, 1)); f.add(p1); f.add(p2); f.add(p3); f.add(p4); f.pack(); f.setVisible(true); // register event handlers bAdd.addActionListener(this); bSub.addActionListener(this); bMul.addActionListener(this); bDiv.addActionListener(this); bClear.addActionListener(this); f.addWindowListener(new MyCloseButtonHandler()); } // override the actionPerformed method public void actionPerformed(ActionEvent ae) { Object source = ae.getSource(); double num1, num2, result = 0.0; if (tf1.getText() != null &amp;&amp; tf2.getText() != null) { num1 = Double.parseDouble(tf1.getText()); num2 = Double.parseDouble(tf2.getText()); if (source == bAdd) result = num1 + num2; else if (source == bSub) result = num1 - num2; else if (source == bMul) result = num1 * num2; else if (source == bDiv) result = num1 / num2; else if (source == bClear) { tf1.setText("0.0"); tf2.setText("0.0"); tf3.setText("0.0"); } else {} // tf3.setText(new Double(result).toString()); tf3.setText("" + result); } } private class MyCloseButtonHandler extends WindowAdapter { public void windowClosing(WindowEvent we) { System.exit(0); } } public static void main(String args[]) { SimpleCalculator sc = new SimpleCalculator(); sc.launchFrame(); } } </code></pre>
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