我有一个JLabel. JLabel的代码如下.

panelmain = new JPanel();

panelmain.setLayout(null);

panelmain.setPreferredSize(new java.awt.Dimension(800, 600));

panelmain.addComponentListener(listen);

panelmain.setBorder(null);

titlebar = new JLabel("Hello World");

titlebar.setBounds(10, 10, 100, 30);

panelmain.add(titlebar);

我的要求是,如果我更改标题栏的字体(即JLabel),那么如何更改标题栏的大小(已在代码中设置为titlebar.setBounds(10,10,100,30);)？

吉里什(Girish)编辑

我的完整代码如下.

import java.awt.event.ComponentEvent;

import java.awt.event.ComponentListener;

import javax.swing.JInternalFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.JScrollPane;

public class IFrame extends JInternalFrame {

/**

*

*/

private static final long serialVersionUID = 6526561589695424088L;

private JScrollPane jsp;

private IFListen listen;

private JPanel panelmain;

protected JPanel panel;

private String title;

private JLabel titlebar;

public IFrame()

{

this.title="";

init();

}

public IFrame(String title)

{

this.title=title;

init();

}

private void init()

{

setLayout(null);

listen=new IFListen();

panelmain=new JPanel();

panelmain.setLayout(null);

panelmain.setPreferredSize(new java.awt.Dimension(800, 600));

panelmain.addComponentListener(listen);

panelmain.setBorder(null);

titlebar=new JLabel("Hello World");

titlebar.setFont(new java.awt.Font("Monotype Corsiva", 1, 48));

panelmain.add(titlebar);

panel=new JPanel();

panel.setBorder(javax.swing.BorderFactory.createTitledBorder(title));

panel.setMinimumSize(new java.awt.Dimension(400, 400));

panel.setSize(400, 400);

panelmain.add(panel);

jsp=new JScrollPane(panelmain);

jsp.setBorder(null);

add(jsp);

this.addComponentListener(listen);

}

//INFO Custom Methods

public void setTitleFont(java.awt.Font font)

{

titlebar.setFont(font); //Here I want to change size of label.

}

//INFO Listener Class for IFrame

private class IFListen implements ComponentListener

{

//INFO Overridden Methods

@Override

public void componentResized(ComponentEvent e)

{

if(e.getSource() instanceof IFrame)

jsp.setBounds(5, 5, getWidth()-20, getHeight()-20);

else if(e.getSource()==panelmain)

{

panel.setLocation(Integer.parseInt(panelmain.getWidth()/2-panel.getWidth()/2+""), 0);

}

}

//INFO Unimplemented Methods

@Override

public void componentShown(ComponentEvent arg0) {}

@Override

public void componentHidden(ComponentEvent arg0) {}

@Override

public void componentMoved(ComponentEvent arg0) {}

}

}

我已经评论了更改字体大小的位置,并且我想更改jlabel的大小.