效果图
源代码：
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","奥观海","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 = "输入或者选择国籍" ;private JFrame frame = new JFrame("投胎系统") ;private Container con = frame.getContentPane() ;private JComboBox jcb1 = null ;Font fnt = new Font("楷体",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("请选择投胎国籍")) ;ComboBoxEditor editor = null;editor = this.jcb1.getEditor() ;this.jcb1.configureEditor(editor,defaultMsg) ;this.jcb1.setMaximumRowCount(4) ; //设置最大显示选项con.add(this.jcb1) ;con.add(new JLabel("赢在起跑线！")) ;this.frame.setSize(180,150) ;this.frame.setVisible(true) ;}}class Tester{ public static void main(String args[]) {new MyComboBox() ; }}
，酒般的思念，一饮就醉，醉时就用全部的热情读这忧伤的月色，
