combodemo.java

Java 程序设计源码 只提供了部分

import java.awt.Container;
import java.awt.GridBagLayout;
import java.awt.GridBagConstraints;
import java.awt.event.ItemListener;
import java.awt.event.ItemEvent;
import java.awt.Component;
import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.JFrame;
import javax.swing.JComboBox;

public class ComboDemo extends JFrame
    implements ItemListener {

  private Container container;
  private JLabel jlbDep, jlbHeader, jlbTel;
  private JTextField jtfHeader, jtfTel;
  private GridBagLayout layout;
  private GridBagConstraints constraints;

  String[] strDep = {"English","Maths","Chemistry","Physics","Ecnomy"};
  String[] strHeader = {"wangyan", "liyi", "sunheping", "wujiang", "zhangjian"};
  String[] strTel = {"13819186265", "13819186265", "13819186265", "13819186265", "13819186265"};

  private JComboBox cmbDep;

  public ComboDemo() {
    super("Combox");
    setSize(260,200);
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  }

  private void addComponent(JPanel panel, GridBagLayout layout, GridBagConstraints
                          gbc, Component com, int row, int column, int numRows,
                          int numColumns, int Weightx, int Weighty) {
    gbc.gridx = row;
    gbc.gridy = column;
    gbc.gridwidth = numRows;
    gbc.gridheight = numColumns;
    gbc.weightx = Weightx;
    gbc.weighty = Weighty;

    layout.setConstraints(com, gbc);

    container.add(com);
  }

  public void setLayout() {
    container = this.getContentPane();

    layout = new GridBagLayout();
    container.setLayout(layout);
    constraints = new GridBagConstraints();
    constraints.anchor = GridBagConstraints.CENTER;
    constraints.fill = GridBagConstraints.HORIZONTAL;

    jlbDep = new JLabel("Dep",jlbDep.CENTER);
    addComponent((JPanel)container, layout, constraints, jlbDep, 0, 0, 1, 1, 20, 0);

    cmbDep = new JComboBox();
    cmbDep.addItemListener(this);
    addComponent((JPanel)container, layout, constraints, cmbDep, 1, 0, 1, 1, 80, 100);

    jlbHeader = new JLabel("Dep Header", JLabel.CENTER);
    addComponent((JPanel)container, layout, constraints, jlbHeader, 0, 1, 1, 1, 20, 0);

    jtfHeader = new JTextField();
    addComponent((JPanel)container, layout, constraints, jtfHeader, 1, 1, 1, 1, 80, 100);

    jlbTel = new JLabel("Tel", JLabel.CENTER);
    addComponent((JPanel)container, layout, constraints, jlbTel, 0, 2, 1, 1, 20, 0);

    jtfTel = new JTextField();
    addComponent((JPanel)container, layout , constraints, jtfTel, 1, 2, 1, 1, 80,100);
  }
  public void addItem() {
    for(int i = 0; i < strDep.length; i++) {
      cmbDep.addItem(strDep[i]);
    }
  }

  public static void main(String[] args) {
    ComboDemo cd = new ComboDemo();

    cd.setLayout();
    cd.addItem();

    cd.setVisible(true);
  }

  public void itemStateChanged(ItemEvent e) {
    if(e.getSource() instanceof JComboBox) {
      int index = cmbDep.getSelectedIndex();

      jtfHeader.setText(strHeader[index]);

      jtfTel.setText(strTel[index]);
    }
  }
}