java swing model實現JComboBox

標籤：jcombobox   swing   

原始碼：

import java.awt.Container ;import java.awt.GridLayout ;import java.awt.Font ;import java.awt.event.WindowListener ;import java.awt.event.WindowEvent ;import java.awt.event.WindowAdapter ;import javax.swing.JFrame ;import javax.swing.JLabel ;import javax.swing.JComboBox ;import javax.swing.ComboBoxEditor ;import javax.swing.AbstractListModel ;import javax.swing.ComboBoxModel ;import javax.swing.BorderFactory ;import java.util.Vector ;class MyComboBoxModel extends AbstractListModel implements ComboBoxModel{   String nations[] = {"天朝","苞米","三胖","奧觀海","三哥"} ;   String item = null;   public Object getSelectedItem()   {        return this.item ;   }     public void setSelectedItem(Object anItem)   {       this.item = (String)anItem ;   }     public Object getElementAt(int in)  {     return this.nations[in] ;  }    public int getSize()  {      return this.nations.length ;  } } ;class MyComboBox{    private String defaultMsg = "輸入或者選擇國籍" ;    private JFrame frame = new JFrame("投胎系統") ;    private Container con = frame.getContentPane() ;    private JComboBox jcb1 = null ;    Font fnt = new Font("楷體",Font.BOLD,20) ;    //private JComboBox jcb2 = null ;       public MyComboBox()    {       this.frame.setLayout(new GridLayout(2,1)) ;             this.jcb1 = new JComboBox(new MyComboBoxModel()) ;       this.jcb1.setEditable(true) ;             jcb1.setBorder(BorderFactory.createTitledBorder("請選擇投胎國籍")) ;       ComboBoxEditor editor = null;       editor = this.jcb1.getEditor() ;       this.jcb1.configureEditor(editor,defaultMsg) ;       this.jcb1.setMaximumRowCount(4) ;    //設定最大顯示選項             con.add(this.jcb1) ;       con.add(new JLabel("贏在起跑線！")) ;             this.frame.setSize(180,150) ;       this.frame.setVisible(true) ;                }}class Tester{   public static void main(String args[])   {        new MyComboBox() ;   }}

java swing model實現JComboBox