caesarFrame.java

package caesarcode;

import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.HeadlessException;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class caesarFrame extends JFrame{

	private final JComboBox jcb;
	private final JPanel p1, p2;
	private final JTextField f1, f2;
	private final JButton btn;
	
	public caesarFrame() throws HeadlessException {
		super("SwingLab");
//		this.setTitle("SwingLab");
		this.setDefaultCloseOperation(EXIT_ON_CLOSE);
		this.setSize(400, 110);
		GridLayout lm=new GridLayout();
		lm.setRows(2);
		lm.setColumns(1);
		this.setLayout(lm);
		
		//felső panel
		p1=new JPanel(new FlowLayout());
		add(p1);
		Object chars[]=new Object[26];
		for(int i=(int)'A';i<=(int)'Z';i++)
			chars[i-(int)'A']=(char)i;
		jcb=new JComboBox(chars); p1.add(jcb);
		f1=new JTextField(20); f1.setEnabled(true); p1.add(f1);
		btn=new JButton(); btn.setText("Code!");
		btn.addActionListener(new OkButtonActionListener());
		p1.add(btn);
		//------------------------------------------------
		
		//alsó panel
		p2=new JPanel(new BorderLayout());
		add(p2);
		p2.add(new JLabel("Output:"),BorderLayout.WEST);
		f2=new JTextField(20);
		f2.setEnabled(false);
		p2.add(f2);
		//-----------------------------------------------
		
		setResizable(true);
		setVisible(true);
	}
	
	private class OkButtonActionListener extends CaesarCode implements ActionListener
	{
		@Override
		public void actionPerformed(ActionEvent ae) {
			f2.setText(caesarCode(f1.getText(), (char)jcb.getSelectedItem()));
		}
	}
}