labeltest.java

来自「经典的<<C how to program>一书第三版的例程。」· Java 代码 · 共 74 行

// Fig. 29.4: LabelTest.java
// Demonstrating the JLabel class.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class LabelTest extends JFrame {
   private JLabel label1, label2, label3;

   public LabelTest()
   {
      super( "Testing JLabel" );

      Container c = getContentPane();
      c.setLayout( new FlowLayout() );

      // JLabel constructor with a string argument
      label1 = new JLabel( "Label with text" );
      label1.setToolTipText( "This is label1" );
      c.add( label1 );

      // JLabel constructor with string, Icon and
      // alignment arguments
      Icon bug = new ImageIcon( "bug1.gif" );
      label2 = new JLabel( "Label with text and icon",
                           bug, SwingConstants.LEFT );
      label2.setToolTipText( "This is label2" );
      c.add( label2 );

      // JLabel constructor no arguments
      label3 = new JLabel();
      label3.setText( "Label with icon and text at bottom" );
      label3.setIcon( bug );
      label3.setHorizontalTextPosition(
         SwingConstants.CENTER );
      label3.setVerticalTextPosition(
         SwingConstants.BOTTOM );
      label3.setToolTipText( "This is label3" );
      c.add( label3 );

      setSize( 275, 170 );
      show();
   }

   public static void main( String args[] )
   { 
      LabelTest app = new LabelTest();

      app.addWindowListener(
         new WindowAdapter() {
            public void windowClosing( WindowEvent e )
            {
               System.exit( 0 );
            }
         }
      );
   }
}

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