JAVA 代码求解

[ywyql_84]

代码如下：

GroupList.java
public class GroupList extends JComponent implements Scrollable {

ArrayList<FolderPanel> tabs = new ArrayList<FolderPanel>();
private GroupListUI listUI;
private int panelHeight = 0;



public GroupList() {
listUI = new GroupListUI();
this.setUI(listUI);
this.setLayout(new FolderGroupLayout());

}

public void addFolder(String text) {
FolderPanel fp = new FolderPanel(text);
tabs.add(fp);
this.add(fp);
}

GroupListUI.java
public class GroupListUI extends ComponentUI {

private static final Color BACK_COLOR = new Color(116,149,226);
public static final int LEFT_PADDING=15;
public static final int TOP_PADDING=15;
private static final int RIGHT_PADDING=15;
private static final int BOTTOM_PADDING=15;

private GroupList list;

public GroupListUI() {

}
@Override
public void installUI(JComponent c) {
c.setOpaque(true);
c.setBackground(BACK_COLOR);
//c.setBorder(BorderFactory.createEtchedBorder(EtchedBorder.LOWERED));
c.setBorder(BorderFactory.createEmptyBorder(LEFT_PADDING,TOP_PADDING,RIGHT_PADDING,BOTTOM_PADDING));
list = (GroupList)c;
}
@Override
public void paint(Graphics g, JComponent c) {
// TODO Auto-generated method stub
System.out.println("GroupListUI paint"); //这里能调用paint输出
}

FolderPanel.java
public class FolderPanel extends JComponent {

private GroupListUI listUI;
private LabelButton button;

public FolderPanel(String text) {
//this.setBounds(listUI.LEFT_PADDING,listUI.TOP_PADDING,50,50);
this.setBorder(BorderFactory.createEtchedBorder(EtchedBorder.LOWERED));
button = new LabelButton(text);
this.add(button);
}
}

LabelButton.java
public class LabelButton extends JComponent {

private LabelButtonUI lUI;

public LabelButton() {
this(null);
}

public LabelButton(String text) {
lUI = new LabelButtonUI(text);
this.setUI(lUI);
}
}

LabelButtonUI.java
public class LabelButtonUI extends ComponentUI {

private String text;
private LabelButton button;


public LabelButtonUI() {

}

public LabelButtonUI(String text) {
this.text = text;
}

@Override
public void installUI(JComponent c) {
// TODO Auto-generated method stub

c.setOpaque(true);
c.setBorder(BorderFactory.createEtchedBorder(EtchedBorder.LOWERED));
button = (LabelButton)c;
System.out.println("LabelButtonUI installUI");
}

@Override
public void paint(Graphics g, JComponent c) {
// TODO Auto-generated method stub
System.out.println("LabelButtonUI paint"); 为什么这里的paint不能被调用，无法输出呢？尝试了好久都没用，本人新手，求各位大神解释
}


}

[ywyql_84]

大神都去哪了？

[cykabc]

太复杂，看不懂

[kimkkkk]

System.out.println("LabelButtonUI"+paint);

[life-of-pi]

System.out.println("LabelButtonUI paint");输出的是LabelButtonUI paint这个字符串。按3楼的写

[ywyql_84]

我的意思是，LabelButtonUI这个paint没有被调用，自己解决了，前面没有ADD，后面肯定无法paint.....