2020-01-16 04:07:02 +00:00
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2022-02-15 06:14:58 +00:00
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2020-01-16 04:07:02 +00:00
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<h1>Lecture Notes for November 15th</h1>
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<p>Import the necessary libraries</p>
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<pre><code class="language-java">import java.awt.*;
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import java.awt.event.*;
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import javax.swing.*;</code></pre>
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<p>This time we'll be using the null layout. This will require you to set the x, and y positions of each of the elements on the screen</p>
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<p>First we'll make a class called <code>GUILayout</code> which will extend <code>JPanel</code> and contain our layout and components</p>
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<pre><code class="language-java">import java.awt.*;
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import java.awt.event.*;
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import javax.swing.*;
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public class GUILayout extends JPanel {
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private JButton one, two;
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private JTextField text;
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private JTextArea area;
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private int count; // Used to keep track of button pushes
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private int number = 0;
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GUILayout() {
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// Set the layout to the null layout
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setLayout(null);
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// Tells the computer that you wish to have the size of your program to be 500x500
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setPreferredSize(new Dimension(500, 500));
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// Create the buttons
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one = new JButton("Change color");
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two = new JButton("Count Pushes");
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// Set the x, y, width, height inside parenthesis
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// This places the buttons on the specified locations on the screen
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one.setBounds(10, 10, 100, 24);
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two.setBounds(120, 10, 100, 24);
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// Sets the color of the text of button 1 to blue
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one.setForeground(Color.BLUE);
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// Add the components to the screen
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add(one);
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add(two);
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text = new JTextField("Today is Wednesday, a photographer is here.");
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text.setBounds(10, 40 ,480, 24);
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add(text);
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area = new JTextArea(20, 20);
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// Wrap the text area into the scroll pane
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// This adds the scroll bars (vertical/horizontal)
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JScrollPane sp = new JScrollPane(area);
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sp.setBounds(10, 75, 490, 400);
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add(sp);
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// Bind the Listener class to the button one
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one.addActionListener(new Listener());
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// Bind it to two and text
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two.addActionListener(new Listener());
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text.addActionListener(new Listener());
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}
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// Create the class for the listener
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private class Listener implements ActionListener {
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// Define what you want to occur after an event
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public void actionPerformed(ActionEvent event) {
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if (event.getSource() == one) {
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} else if (event.getSource() == two) {
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count++;
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// \n is needed to prevent scrolling
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area.append("You pressed the button " + count + " times!");
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} else if (event.getSource() == text) {
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// Grab the number inside the text area and set it to the variable number
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number = Integer.paseInt(text.getText());
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number += 10;
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// add "" to number so that it converts number to a String
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text.setText(number + "");
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// Convert the number to a String
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String temp = Integer.toString(number);
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area.setText(temp);
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}
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}
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}
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}</code></pre>
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<p>The main code is really short, you just need to extend <code>JFrame</code> and some short code seen last class to set it up.</p>
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<pre><code class="language-java">public class mainTester extends JFrame {
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public static void main(String[] args) {
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JFrame frame = new JFrame("Sample GUI"); // Sets the title to "Sample GUI"
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frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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// Instantiate the GUILayout file you made before
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frame.getContentPane().add(new GUILayout());
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}
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}</code></pre>
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