JAVA 프로그래밍 - NumberAddition V4 Inner Class
// 컴퓨터공학과 3학년 안치영
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.JButton;
import javax.swing.JTextField;
import javax.swing.BorderFactory;
import javax.swing.SpringLayout;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public class NumberAdditionV4{
//define reference variables for GUI components
private JFrame frame;
private JPanel jPanel;
private JTextField jTextFieldFirstNumber, jTextFieldSecondNumber, jTextFieldResult;
private JLabel jLabel1, jLabel2, jLabel3;
private JButton jButtonAdd, jButtonClear, jButtonExit, jButtonPressed;
private SpringLayout s;
// jButtonAdd 의 Inner class method
public void addButtonPressed(ActionEvent evt){
jTextFieldResult.setText(""+(Double.parseDouble(jTextFieldFirstNumber.getText()) + Double.parseDouble(jTextFieldSecondNumber.getText())));
}
// jButtonClear 의 Inner class method
public void clearButtonPressed(ActionEvent evt){
jTextFieldFirstNumber.setText("");
jTextFieldSecondNumber.setText("");
jTextFieldResult.setText("");
}
// jButtonExit 의 Inner class method
public void exitButtonPressed(ActionEvent evt){
System.exit(0);
}
/* constructor */
public NumberAdditionV4() {
//Place codes for an initializing object other than GUI
//...
//Create and Show up GUI
initComponents();
}
private void initComponents() {
//(1) Create and set up the window.
frame = new JFrame("Number Addition Version 3: Layout Manager");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(400, 300);
//(2) Create Component and attach onto jPanel
jPanel = new JPanel();
//jPanel.setBorder(BorderFactory.createEmptyBorder(10,20,10,20)); //top, left, bottom, right
//jPanel.setBorder(BorderFactory.createTitledBorder("Number Addition"));
jPanel.setBorder(BorderFactory.createMatteBorder(10,20,10,20, java.awt.Color.GREEN));
//-----------------------
addWidgets(); //create each GUI components and attatch onto the panel
//-----------------------
//(3) Add jPanel to Content Pane
frame.getContentPane().add(jPanel);
//(4) Display the window.
//center the frame ------------------------------------------------------------
frame.setLocation(((java.awt.Toolkit.getDefaultToolkit().getScreenSize().width
- frame.getSize().width) / 2),
((java.awt.Toolkit.getDefaultToolkit().getScreenSize().height
- frame.getSize().height) / 2));
//-----------------------------------------------------------------------------
frame.setVisible(true);
}
private void addWidgets() {
//create widgets
jLabel1 = new JLabel("First Number :");
jLabel2 = new JLabel("Second Number :");
jLabel3 = new JLabel("Result :");
jTextFieldFirstNumber = new JTextField(20);
jTextFieldSecondNumber = new JTextField(20);
jTextFieldResult = new JTextField(20);
jButtonAdd = new JButton("Add");
jButtonAdd.setSize(80,30);
jButtonAdd.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt){
addButtonPressed(evt);
}
});
jButtonClear = new JButton("Clear");
jButtonClear.setSize(80,30);
jButtonClear.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt){
clearButtonPressed(evt);
}
});
jButtonExit = new JButton("Exit");
jButtonExit.setSize(80,30);
jButtonExit.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt){
exitButtonPressed(evt);
}
});;
//-----------------------
layoutComponents(); //define layout method
//-----------------------
//add widgets onto the panel
jPanel.add(jLabel1);
jPanel.add(jTextFieldFirstNumber);
jPanel.add(jLabel2);
jPanel.add(jTextFieldSecondNumber);
jPanel.add(jLabel3);
jPanel.add(jTextFieldResult);
jPanel.add(jButtonAdd);
jPanel.add(jButtonClear);
jPanel.add(jButtonExit);
}
private void layoutComponents() {
//define layout method
s = new SpringLayout();
jPanel.setLayout(s);
//add components to the Panel
//define constants for gaps between components
final int HORIZONTAL_GAP = 10;
final int VERTICAL_GAP = 20;
//jLabel1
s.putConstraint(SpringLayout.WEST, jLabel1, 30,
SpringLayout.WEST, jPanel);
s.putConstraint(SpringLayout.NORTH, jLabel1, 30,
SpringLayout.NORTH, jPanel);
//jTextFieldFirstNumber
s.putConstraint(SpringLayout.WEST, jTextFieldFirstNumber, HORIZONTAL_GAP,
SpringLayout.EAST, jLabel1);
s.putConstraint(SpringLayout.NORTH, jTextFieldFirstNumber, 0,
SpringLayout.NORTH, jLabel1);
//jLabel2
s.putConstraint(SpringLayout.EAST, jLabel2, 0,
SpringLayout.EAST, jLabel1);
s.putConstraint(SpringLayout.NORTH, jLabel2, VERTICAL_GAP,
SpringLayout.SOUTH, jLabel1);
//jTextFieldSecondNumber
s.putConstraint(SpringLayout.WEST, jTextFieldSecondNumber, HORIZONTAL_GAP,
SpringLayout.EAST, jLabel2);
s.putConstraint(SpringLayout.NORTH, jTextFieldSecondNumber, 0,
SpringLayout.NORTH, jLabel2);
//jLabel3
s.putConstraint(SpringLayout.EAST, jLabel3, 0,
SpringLayout.EAST, jLabel2);
s.putConstraint(SpringLayout.NORTH, jLabel3, VERTICAL_GAP,
SpringLayout.SOUTH, jLabel2);
//jTextFieldResult
s.putConstraint(SpringLayout.WEST, jTextFieldResult, HORIZONTAL_GAP,
SpringLayout.EAST, jLabel3);
s.putConstraint(SpringLayout.NORTH, jTextFieldResult, 0,
SpringLayout.NORTH, jLabel3);
//jButtonAdd
s.putConstraint(SpringLayout.WEST, jButtonAdd, 0,
SpringLayout.WEST, jTextFieldFirstNumber);
s.putConstraint(SpringLayout.NORTH, jButtonAdd, VERTICAL_GAP + 5,
SpringLayout.SOUTH, jTextFieldResult);
//jButtonClear
s.putConstraint(SpringLayout.WEST, jButtonClear, HORIZONTAL_GAP + 5,
SpringLayout.EAST, jButtonAdd);
s.putConstraint(SpringLayout.NORTH, jButtonClear, 0,
SpringLayout.NORTH, jButtonAdd);
//jButtonExit
s.putConstraint(SpringLayout.WEST, jButtonExit, HORIZONTAL_GAP + 5,
SpringLayout.WEST, jButtonClear);
s.putConstraint(SpringLayout.NORTH, jButtonExit, VERTICAL_GAP,
SpringLayout.SOUTH, jButtonClear);
}
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
new NumberAdditionV4();
}
});
}
}
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