リスト

項目の選択

java.lang.Object
  |
  +--java.awt.Component
        |
        +--java.awt.Container
              |
              +--javax.swing.JComponent
                    |
                    +--javax.swing.JList

public class JList extends JComponent
	implements Scrollable, Accessible

java.lang.Object
  |
  +--java.util.EventObject
        |
        +--javax.swing.event.ListDataEvent

public class ListDataEvent extends EventObject

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

public class Test extends JApplet {
	public void init() {
		String item[] = {
			"涼宮 遙" , "速瀬 水月" , "涼宮 茜" ,
			"大空寺 あゆ" , "玉野 まゆ"
		};

		JList list = new JList(item);
		JScrollPane scroll = new JScrollPane(list);
		getContentPane().add(scroll);
	}
}

java.lang.Object
  |
  +--java.util.EventObject
        |
        +--javax.swing.event.ListSelectionEvent

public class ListSelectionEvent extends EventObject

public ListSelectionEvent(
	Object source , int firstIndex ,
	int lastIndex, boolean isAdjusting
)

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

public class Test extends JApplet implements ListSelectionListener {
	JLabel label = new JLabel("項目を選択してください");
	JList list = new JList();

	public void init() {
		String item[] = {
			"涼宮 遙" , "速瀬 水月" , "涼宮 茜" ,
			"大空寺 あゆ" , "玉野 まゆ"
		};

		list.setListData(item);
		list.addListSelectionListener(this);

		getContentPane().add(label , BorderLayout.NORTH);
		getContentPane().add(new JScrollPane(list) , BorderLayout.CENTER);
	}
	public void valueChanged(ListSelectionEvent e) {
		label.setText(list.getSelectedValue().toString());
	}
}

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

public class Test extends JApplet implements ActionListener {
	JList list = new JList();
	public void init() {
		String item[] = {
			"涼宮 遙" , "速瀬 水月" , "涼宮 茜" ,
			"大空寺 あゆ" , "玉野 まゆ"
		};
		list.setListData(item);

		JButton button = new JButton("Show Selected");
		button.addActionListener(this);

		getContentPane().add(button , BorderLayout.NORTH);
		getContentPane().add(new JScrollPane(list) , BorderLayout.CENTER);
	}
	public void actionPerformed(ActionEvent e) {
		JOptionPane.showMessageDialog(this , list.getSelectedValues());
	}
}

セルレンダラ

public Component getListCellRendererComponent(
	JList list , Object value , int index ,
	boolean isSelected , boolean cellHasFocus
)

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

/*	<applet code="Test.class" width="300"height="300">
 	</applet>
*/

public class Test extends JApplet implements ListCellRenderer {
	JList list = new JList();
	public void init() {
		String item[] = new String[10];
		for(int i = 0 ; i < item.length ; i++) item[i] = "Kitty " + i;
		list.setListData(item);
		list.setCellRenderer(this);

		getContentPane().add(new JScrollPane(list));
	}
	public Component getListCellRendererComponent(
			JList list , Object value , int index ,
			boolean isSelected , boolean cellHasFocus) {
		Icon icon = new ImageIcon("icon.jpg");
		JLabel label = new JLabel();
		label.setOpaque(true);
		label.setPreferredSize(new Dimension(
			icon.getIconWidth() , icon.getIconHeight()
		));

		if (isSelected) {
			label.setText(value.toString());
			label.setIcon(icon);
			label.setBackground(list.getSelectionBackground());
			return label;
		}
		else {
			label.setText("◆" + value.toString());
			label.setBackground(list.getBackground());
			return label;
		}
	}
}