JAVA中对同一问题分别使用内部类与匿名内部类实现，基于轻量级组件Swing中JComboBox组件来举例说明，希望能够有助于深入理解内部类与匿名内部类的区别以及其使用。

package com.han;import javax.swing.*;import java.awt.*;import java.awt.event.*;/** * 设计了一个Swing窗体，其中包括了JComboBox组件(下拉列表框)， * 在下面的代码中运用了内部类的手段。 * @author HAN * */@SuppressWarnings("serial")public class SwingJComboBox extends JFrame{	public SwingJComboBox(){		setLayout(null);		setBounds(130,30,300,200);		Container c=getContentPane();		final MyComboBox obj1=new MyComboBox();		@SuppressWarnings({ "unchecked", "rawtypes" })		JComboBox jc=new JComboBox(obj1);		jc.setBounds(0,0,290,20);//		System.out.println(obj1.getElementAt(0));		jc.addActionListener(new ActionListener(){			public void actionPerformed(ActionEvent arg0){			    System.out.println(obj1.getSelectedItem());			}		});		JCheckBox jck1=new JCheckBox("男");		JCheckBox jck2=new JCheckBox("女",true);		jck1.setBounds(100,80,40,20);		jck2.setBounds(140,80,40,20);		JButton jb1=new JButton("确定");		JButton jb2=new JButton("取消");		jb1.setBounds(80,130,60,30);		jb2.setBounds(140,130,60,30);		c.add(jc);		c.add(jck1);		c.add(jck2);		c.add(jb1);		c.add(jb2);		setVisible(true);		setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); //very important !!	}		@SuppressWarnings("rawtypes")	class MyComboBox extends AbstractListModel implements ComboBoxModel {		String selecteditem="军人证";		String[] test={"身份证","军人证","学生证"};		public void setSelectedItem(Object item){			selecteditem=(String)item;		}		public Object getSelectedItem(){			return selecteditem;		}		@Override		public int getSize() {			// TODO Auto-generated method stub			return test.length;		}		@Override		public Object getElementAt(int index) {			// TODO Auto-generated method stub			return test[index];		}			}	    public static void main(String[] args){    	new SwingJComboBox();    	    }}

package com.han;import javax.swing.*;import javax.swing.event.ListDataListener;import java.awt.*;import java.awt.event.*;/** * 设计了一个Swing窗体，其中包括了JComboBox组件(下拉列表框)， * 在下面的代码中运用了匿名内部类的手段。 * @author HAN * */@SuppressWarnings("serial")public class SwingJComboBox extends JFrame{	public static String selectedItem;	public SwingJComboBox(){		setLayout(null);		setBounds(130,30,300,200);		Container c=getContentPane();//		final MyComboBox obj1=new MyComboBox();		@SuppressWarnings({ "unchecked", "rawtypes" })		JComboBox jc=new JComboBox(new ComboBoxModel(){			String selecteditem="军人证";			String[] test={"身份证","军人证","学生证"};//			public void getItem(){//				selectedItem=selecteditem;//			}			@Override			public int getSize() {				// TODO Auto-generated method stub				return test.length;			}			@Override			public Object getElementAt(int index) {				// TODO Auto-generated method stub				return test[index];			}			@Override			public void setSelectedItem(Object anItem) {				// TODO Auto-generated method stub				selecteditem=(String) anItem;			}			@Override			public Object getSelectedItem() {				// TODO Auto-generated method stub//				getItem();				selectedItem=selecteditem;				return selecteditem;			}			@Override			public void addListDataListener(ListDataListener l) {				// TODO Auto-generated method stub							}			@Override			public void removeListDataListener(ListDataListener l) {				// TODO Auto-generated method stub							}					});		jc.setBounds(0,0,290,20);//		System.out.println(obj1.getElementAt(0));		jc.addActionListener(new ActionListener(){			public void actionPerformed(ActionEvent arg0){			    System.out.println(selectedItem);			}		});		JCheckBox jck1=new JCheckBox("男");		JCheckBox jck2=new JCheckBox("女",true);		jck1.setBounds(100,80,40,20);		jck2.setBounds(140,80,40,20);		JButton jb1=new JButton("确定");		JButton jb2=new JButton("取消");		jb1.setBounds(80,130,60,30);		jb2.setBounds(140,130,60,30);		c.add(jc);		c.add(jck1);		c.add(jck2);		c.add(jb1);		c.add(jb2);		setVisible(true);		setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); //very important !!	}		    public static void main(String[] args){    	new SwingJComboBox();    	    }}