[Ch15] Examples for swing components (1335d8b3) · Commits · examples / Head First Java 3rd Edition

src/main/java/ch15/CheckboxExample.java

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Changes for src/main/java/ch15/CheckboxExample.java: 36 added lines, 0 removed lines.
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		package ch15;

		import javax.swing.*;
		import java.awt.*;
		import java.awt.event.*;

		public class CheckboxExample {

		private JCheckBox check;

		public static void main(String[] args) {
		CheckboxExample gui = new CheckboxExample();
		gui.go();
		}

		public void go() {
		JFrame frame = new JFrame();
		JPanel panel = new JPanel();

		check = new JCheckBox("Goes to 11");
		panel.add(check);

		frame.getContentPane().add(BorderLayout.NORTH, panel);
		frame.setSize(200, 200);
		frame.setVisible(true);
		}

		public void itemStateChanged(ItemEvent e) {
		String onOrOff = "off";
		if (check.isSelected()) {
		onOrOff = "on";
		}
		System.out.println("Check box is " + onOrOff);
		}
		}

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Changes for src/main/java/ch15/ListExample.java: 56 added lines, 0 removed lines.
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		package ch15;

		import javax.swing.*;
		import javax.swing.event.ListSelectionEvent;
		import javax.swing.event.ListSelectionListener;
		import java.awt.*;

		public class ListExample implements ListSelectionListener {
		private JList<String> list;

		public static void main(String[] args) {
		ListExample gui = new ListExample();
		gui.go();
		}

		public void go() {
		JFrame frame = new JFrame();
		JPanel panel = new JPanel();

		String[] listEntries = {"alpha", "beta", "gamma", "delta",
		"epsilon", "zeta", "eta", "theta "};

		list = new JList<>(listEntries);
		list.setVisibleRowCount(4);
		list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
		list.addListSelectionListener(this);

		JScrollPane scroller = new JScrollPane(list);
		scroller.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
		scroller.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);

		panel.add(scroller);

		frame.getContentPane().add(BorderLayout.CENTER, panel);

		frame.setSize(200, 150);
		frame.setVisible(true);
		}

		public void valueChanged(ListSelectionEvent e) {
		if (!e.getValueIsAdjusting()) {
		String selection = list.getSelectedValue();
		System.out.println(selection);
		}
		}
		}










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+5 −12

Changes for src/main/java/ch15/TextArea1.java: 5 added lines, 12 removed lines.
Original line number	Diff line number	Diff line
		@@ -4,24 +4,21 @@ import javax.swing.*;
		import java.awt.*;
		import java.awt.event.*;


		public class TextArea1 implements ActionListener {

		JTextArea text;

		public class TextArea1 {
		public static void main(String[] args) {
		TextArea1 gui = new TextArea1();
		gui.go();
		}


		public void go() {
		JFrame frame = new JFrame();
		JPanel panel = new JPanel();

		JButton button = new JButton("Just Click It");
		button.addActionListener(this);
		text = new JTextArea(10, 20);

		JTextArea text = new JTextArea(10, 20);
		text.setLineWrap(true);
		button.addActionListener(e -> text.append("button clicked "));

		JScrollPane scroller = new JScrollPane(text);
		scroller.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
		@@ -35,10 +32,6 @@ public class TextArea1 implements ActionListener {
		frame.setSize(350, 300);
		frame.setVisible(true);
		}

		public void actionPerformed(ActionEvent ev) {
		text.append("button clicked \n ");
		}
		}

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+28 −0

Changes for src/main/java/ch15/TextFieldExample.java: 28 added lines, 0 removed lines.
Original line number	Diff line number	Diff line
		package ch15;

		import javax.swing.*;
		import java.awt.*;

		public class TextFieldExample {

		public static void main(String[] args) {
		TextFieldExample gui = new TextFieldExample();
		gui.go();
		}

		public void go() {
		JFrame frame = new JFrame();
		JPanel panel = new JPanel();

		JTextField textField = new JTextField(20);
		JLabel label = new JLabel("Dog's first name:");
		panel.add(label);
		panel.add(textField);

		frame.getContentPane().add(BorderLayout.NORTH, panel);
		frame.setSize(400,200);
		frame.setVisible(true);
		}

		}

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