package java0915_gui.answ;

import java.awt.BorderLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.DefaultComboBoxModel;

import javax.swing.JComboBox;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JOptionPane;

import javax.swing.JPanel;

import javax.swing.JTextArea;

class MenuItem extends JFrame implements ActionListener {

JComboBox<String> firstCom, secondCom;

JTextArea ta;

String[] foodMain = new String[] { "선택하세요", "한식", "중식", "일식" };

String[][] foodSub = new String[][] { { "선택하세요", "불고기", "비빔밥", "삼계탕" }, { "선택하세요", "짬뽕", "짜장", "탕수육" },

{ "선택하세요", "돈부리", "우동", "덮밥" } };

boolean chk = false;

public MenuItem() {

firstCom = new JComboBox<String>(foodMain);

secondCom = new JComboBox<String>();

secondCom.addItem("선택하세요");

JPanel jp = new JPanel();

jp.add(new JLabel("MENU : "));

jp.add(firstCom);

jp.add(secondCom);

ta = new JTextArea(10, 15);

add(BorderLayout.NORTH, jp);

add(BorderLayout.CENTER, ta);

firstCom.addActionListener(this);

secondCom.addActionListener(this);

setSize(400, 300);

setVisible(true);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}// end MenuItem

@Override

public void actionPerformed(ActionEvent e) {

// ActionEvent가 발생된 객체를 반환한다.

Object obj = e.getSource();

if (obj == firstCom) {

int index = firstCom.getSelectedIndex();

if (index == 0) {

for (int i = secondCom.getItemCount() - 1; i > 0; i--)

secondCom.removeItemAt(i);

menuMessage("한식,중식,일식 메뉴를 선택하세요.");

return;

}

secondCom.setModel(new DefaultComboBoxModel<String>(foodSub[index - 1]));

/*

* for(int i=secondCom.getItemCount()-1 ;i>=0; i--) secondCom.removeItemAt(i);

* for(int i=0;i<foodSub[index-1].length;i++)

* secondCom.addItem(foodSub[index-1][i]);

*/

} else if (obj == secondCom) {

int index = secondCom.getSelectedIndex();

if (index == 0) {

menuMessage("음식메뉴를 선택하세요");

return;

}

ta.setText(firstCom.getSelectedItem() + " : " + secondCom.getSelectedItem());

}

}

public void menuMessage(String message) {

JOptionPane.showMessageDialog(this, message);

}

}// end class

public class Prob01 {

public static void main(String[] args) {

MenuItem mt = new MenuItem();

}// end main()

}// end class