窗口大小设置为setSize(605,403)
文本大小设置为textJLabel.setSize（400,88);
文本内容是Welcome to Java Programming!
这时候会出现省略号，可当文本大小超过550后，就会完整显示出来
源代码如下
import java.awt.*;
import javax.swing.*;
public class Welcome extends JFrame
{
private JLabel textJLabel; // JLabel that displays text
private JLabel pictureJLabel; // JLabel that displays an image
// no-argument constructor
public Welcome()
{
createUserInterface();
}
// create and position GUI components; register event handlers
private void createUserInterface()
{
// get content pane and set layout to null
Container contentPane = getContentPane();
contentPane.setBackground( Color.BLACK);
contentPane.setLayout( null );
// set up textJLabel
textJLabel = new JLabel(); //分配空间
textJLabel.setText( "Welcome to Java Programming!" );
textJLabel.setLocation(10,40);
textJLabel.setSize(500,88);
textJLabel.setFont( new Font( "SansSerif", Font.PLAIN, 36 ) );
textJLabel.setHorizontalAlignment( JLabel.CENTER );
contentPane.add( textJLabel );
// set up pictureJLabel
pictureJLabel = new JLabel();
pictureJLabel.setIcon( new ImageIcon( "bug.png" ) );
pictureJLabel.setBounds( 54, 120, 500, 250 );
pictureJLabel.setHorizontalAlignment( JLabel.CENTER );
contentPane.add( pictureJLabel );
// set properties of application's window
setTitle( "Welcome to pengbin's world" ); // set JFrame's title bar string
setSize( 605,413 ); // set width and height of JFrame
setVisible( true ); // display JFrame on screen
} // end method createUserInterface
// main method
public static void main( String[] args )
{
Welcome application = new Welcome();
application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
} // end method main
} // end class Welcome
------解决方案--------------------
因为你文字太大了，你把文字大小改成32以下你看看。所以你要么改变JLabel组件大小，要么改变文字大小。