/**

* Java. Level 2. Lesson 4. Swing

* Examples for lesson

*

* @author Sergey Iryupin

* @version dated Sep 08, 2017

*/

import java.awt.*;

import javax.swing.*;

import java.awt.event.*;

import javax.swing.event.*;

class J2Lesson4 extends JFrame {

public static void main(String[] args) {

new J2Lesson4();

}

J2Lesson4() {

setTitle("GUI Demo");

setBounds(500, 200, 800, 600);

setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

setLayout(new GridLayout(2, 2));

JPanel[] jp = new JPanel[4];

for (int i = 0; i < 4; i++) {

jp[i] = new JPanel();

add(jp[i]);

jp[i].setBackground(new Color(100 + i*40, 100 + i*40, 100 + i*40));

}

// left up panel

jp[0].setLayout(new BorderLayout());

JTextArea jta = new JTextArea();

JScrollPane jsp = new JScrollPane(jta);

jp[0].add(jsp);

// right up panel

jp[1].setLayout(new FlowLayout());

JRadioButton[] jrb = new JRadioButton[4];

ButtonGroup bgr = new ButtonGroup();

for (int i = 0; i < jrb.length; i++) {

jrb[i] = new JRadioButton("Option #" + i);

bgr.add(jrb[i]);

jp[1].add(jrb[i]);

}

JCheckBox[] jcb = new JCheckBox[4];

for (int i = 0; i < jcb.length; i++) {

jcb[i] = new JCheckBox("Check #" + i);

jp[1].add(jcb[i]);

}

// left down panel

jp[2].setLayout(new FlowLayout());

String[] comboStr = {"Item #1", "Item #2", "Item #3", "Item #4"};

JComboBox<String> jcombo1 = new JComboBox<String>(comboStr);

JComboBox<String> jcombo2 = new JComboBox<String>(comboStr);

jp[2].add(jcombo1);

jp[2].add(jcombo2);

jcombo1.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

System.out.println(jcombo1.getSelectedItem().toString());

}

});

// right down panel

jp[3].setLayout(null);

JSlider js = new JSlider();

JLabel jlab = new JLabel("Value: 50");

js.setMaximum(100);

js.setMinimum(0);

js.setValue(50);

jp[3].add(jlab);

jp[3].add(js);

js.addChangeListener(new ChangeListener() {

@Override

public void stateChanged(ChangeEvent e) {

jlab.setText("Value: " + js.getValue());

}

});

jlab.setBounds(10,10,100,20);

js.setBounds(20, 40, 300, 100);

js.setBackground(new Color(160,255,160));

// drop-down menu

JMenuBar mainMenu = new JMenuBar();

JMenu mFile = new JMenu("File");

JMenu mEdit = new JMenu("Edit");

JMenuItem miFileNew = new JMenuItem("New");

JMenuItem miFileExit = new JMenuItem("Exit");

setJMenuBar(mainMenu);

mainMenu.add(mFile);

mainMenu.add(mEdit);

mFile.add(miFileNew);

mFile.addSeparator();

mFile.add(miFileExit);

miFileExit.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

System.exit(0);

}

});

setVisible(true);

}

}