内部类不能访问外部类的变量吗？

Java code

import javax.swing.*;import java.awt.*;import java.awt.event.*;public class InformationTable extends JTable {    public InformationTable(AlterPanel alterPanel) {        super(new ResultTableModel());                this.getTableHeader().setReorderingAllowed(false);        this.addMouseListener(new MouseAdapter() {            public void mouseClicked(MouseEvent me) {                int rowIndex = getSelectedRow();                JTextField[] fieldList = { alterPanel.getIdField(),                        alterPanel.getNameField(), alterPanel.getSexField(),                        alterPanel.getBirthField(), alterPanel.getClassField(),                        alterPanel.getDepartmentField() };            }        });    }}

为什么下面那段代码总是报错？

Java code

JTextField[] fieldList = { alterPanel.getIdField(),                        alterPanel.getNameField(), alterPanel.getSexField(),                        alterPanel.getBirthField(), alterPanel.getClassField(),                        alterPanel.getDepartmentField() };

报错是：Cannot refer to a non-final variable alterPanel inside an inner class defined in a different method

为什么呢？


[解决办法]
public InformationTable(final AlterPanel alterPanel)