案例7使用Swing实现学生成绩查询系统基本功能【精品-ppt】.ppt

import java.awt.*; import java.awt.event.* ; import javax.swing.*; public class ItemDemo implements ItemListener{ JFrame f; JPanel p1,p2,p3; JLabel birthPlace,hobby; JComboBox place; JCheckBox hobby1,hobby2,hobby3; public ItemDemo(String title){ f=new JFrame(title); p1=new JPanel(); birthPlace=new JLabel(出生地:); place=new JComboBox(); place.addItemListener(this); place.addItem(杭州); place.addItem(宁波); place.addItem(温州); place.addItem(绍兴); p1.add(birthPlace); p1.add(place); f.add(p1,North); * p2=new JPanel(); p2.setLayout(new GridLayout(3,1)); hobby=new JLabel(业余爱好:); hobby1=new JCheckBox(运动); hobby1.addItemListener(this); hobby2=new JCheckBox(旅游); hobby2.addItemListener(this); hobby3=new JCheckBox(上网); hobby3.addItemListener(this); p2.add(hobby1); p2.add(hobby2); p2.add(hobby3); p3=new JPanel(); p3.add(hobby); p3.add(p2); f.add(p3,Center); f.pack(); f.setVisible(true); } * public void itemStateChanged(ItemEvent e){ if(e.getSource()==placee.getStateChange()==ItemEvent.SELECTED){ System.out.println(您当前选择的是+place.getSelectedItem()); } else if(e.getSource()==hobby1 hobby1.isSelected() ){ System.out.println(您的业余爱好有：+hobby1.getLabel()); } else if(e.getSource()==hobby2 hobby2.isSelected()){ System.out.println(您的业余爱好有：+hobby2.getLabel()); } else if(e.getSource()==hobby3 hobby3.isSelected()){ System.out.println(您的业余爱好有：+hobby3.getLabel()); } } public static void main(String args[ ]){ new ItemDemo(测试ItemListener!); } } * 鼠标事件处理 鼠标事件的监听器有鼠标事件监听器(MouseListener)、鼠标移动事件监听器(MouseMotionListener)和鼠标滚轮事件监听器(MouseWheelListener) 鼠标事件对应的类是MouseEvent，其中定义了以下一些常量和方法：