JList能否改变指定单元格背景颜色？
初学JAVA，小小测试下JAVA JList控件的功能，
貌似以前学C#时List类的控件可以改变指定单元格背景色，不知道JAVA里的JList是否同样可以？
求高人指点？
代码如下
- Java code
import java.awt.BorderLayout;import java.awt.Color;import java.awt.Component;import java.awt.Container;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.util.Vector;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JList;import javax.swing.JScrollPane;import javax.swing.ListCellRenderer;/** * 测试改变指定单元格元素 * @author 天册 * 2011年12月8日 */public class TestLists extends JFrame implements ActionListener { Vector v = new Vector(); JList lst = new JList(v); JButton btnTest = new JButton("测试"); public TestLists() { setLocation(400, 300); Container c = this.getContentPane(); c.add(new JScrollPane(lst), BorderLayout.CENTER); c.add(btnTest, BorderLayout.SOUTH); pack(); setVisible(true); lstLaunch(); //lst中添加元素和指定单元格类型的方法 this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); btnTest.addActionListener(this); //通过按钮事件改变JList某个单元格 } private void lstLaunch() { for (int i = 0; i < 10; i++) { v.addElement(i); } lst.setCellRenderer(new MyRender()); } /** * @param args */ public static void main(String[] args) { TestLists tl = new TestLists(); } @Override public void actionPerformed(ActionEvent e) { Object o = e.getSource(); if (o.equals(btnTest)) { //跪求高人指点此处该怎么写才能改变指定单元格，比如第3个单元格背景色设置为红色 } } /** * Copy 自API文档，应该是设置单元格属性的东东。。。 * @author SUN */ private class MyRender extends JButton implements ListCellRenderer { public MyRender() { this.setOpaque(true); } @Override public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) { setText(value.toString()); Color background; Color foreground; // check if this cell represents the current DnD drop location JList.DropLocation dropLocation = list.getDropLocation(); if (dropLocation != null && !dropLocation.isInsert() && dropLocation.getIndex() == index) { background = Color.BLUE; foreground = Color.red; // check if this cell is selected } else if (isSelected) { background = Color.green; foreground = Color.red; // unselected, and not the DnD drop location } else { background = Color.WHITE; foreground = Color.BLACK; } ; setBackground(background); setForeground(foreground); return this; } }}[解决办法]
- Java code
import java.awt.BorderLayout;import java.awt.Color;import java.awt.Component;import java.awt.Container;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.util.Vector;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JList;import javax.swing.JScrollPane;import javax.swing.ListCellRenderer;/** * 测试改变指定单元格元素 * @author 天册 * 2011年12月8日 */public class TestLists extends JFrame implements ActionListener { Vector v = new Vector(); JList lst = new JList(v); JButton btnTest = new JButton("测试"); private int curIndex = -1; public TestLists() { setLocation(400, 300); Container c = this.getContentPane(); c.add(new JScrollPane(lst), BorderLayout.CENTER); c.add(btnTest, BorderLayout.SOUTH); pack(); setVisible(true); lstLaunch(); //lst中添加元素和指定单元格类型的方法 this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); btnTest.addActionListener(this); //通过按钮事件改变JList某个单元格 } private void lstLaunch() { for (int i = 0; i < 10; i++) { v.addElement(i); } lst.setCellRenderer(new MyRender()); } /** * @param args */ public static void main(String[] args) { TestLists tl = new TestLists(); } @Override public void actionPerformed(ActionEvent e) { Object o = e.getSource(); if (o.equals(btnTest)) { curIndex = 3; // 比如第3个单元格... lst.repaint(); } } /** * Copy 自API文档，应该是设置单元格属性的东东。。。 * @author SUN */ private class MyRender extends JButton implements ListCellRenderer { public MyRender() { this.setOpaque(true); } @Override public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) { setText(value.toString()); Color background = Color.WHITE; Color foreground = Color.BLACK; if (index == curIndex) { background = Color.red; foreground = Color.white; // check if this cell is selected } else if (isSelected) { background = Color.green; foreground = Color.red; } setBackground(background); setForeground(foreground); return this; } }}