jcomboxusedemo.java

JAVA编程思想源代码 值得一下 很难找的

package chapter11;

import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;

import javax.swing.JApplet;
import javax.swing.JComboBox;
import javax.swing.JLabel;
import javax.swing.JTextField;

public class JComBoxUseDemo extends JApplet implements ItemListener {
	Container ctp = getContentPane();

	JTextField tf1 = new JTextField(5), tf2 = new JTextField(5);

	JLabel lb1 = new JLabel("Price:"), lb2 = new JLabel("Stock:");

	String items[] = { "西红柿", "黄瓜", "白菜", "红萝卜" }, price[] = { "1.00",
			"1.10", "0.50", "2.00" }, num[] = { "100", "150", "500",
			"1502" };

	JComboBox cbx = new JComboBox();

	public void init() {
		ctp.setLayout(new FlowLayout());
		for (int n = 0; n < items.length; n++)
			cbx.addItem(items[n]);
		ctp.add(cbx);
		cbx.addItemListener(this);
		ctp.add(lb1);
		ctp.add(tf1);
		ctp.add(lb2);
		ctp.add(tf2);
		setSize(300, 100);
	}

	public void itemStateChanged(ItemEvent e) {
		int x = 0, y;
		String s = (String) e.getItem();
		for (y = 0; y < items.length; y++)
			if (s == items[y])
				x = cbx.getSelectedIndex();
		tf1.setText(price[x]);
		tf2.setText(num[x]);
	}
}