130 lines
3.0 KiB
Java
130 lines
3.0 KiB
Java
Class Stack examples
|
|
|
|
// Testing the Stack class of the java.util package
|
|
import java.util.*;
|
|
import java.awt.*;
|
|
import java.awt.event.*;
|
|
import javax.swing.*;
|
|
|
|
public class StackTest extends JFrame
|
|
{
|
|
|
|
public StackTest()
|
|
{
|
|
super( "Stacks" );
|
|
|
|
Container c = getContentPane();
|
|
|
|
final JLabel status = new JLabel();
|
|
final Stack s = new Stack();
|
|
|
|
c.setLayout( new FlowLayout() );
|
|
c.add( new JLabel( "Enter a string" ) );
|
|
final JTextField input = new JTextField( 10 );
|
|
c.add( input );
|
|
|
|
JButton pushBtn = new JButton( "Push" );
|
|
pushBtn.addActionListener( new ActionListener()
|
|
{
|
|
public void actionPerformed( ActionEvent e )
|
|
{
|
|
status.setText( "Pushed: " + s.push( input.getText() ) );
|
|
}
|
|
} );
|
|
c.add( pushBtn );
|
|
|
|
JButton popBtn = new JButton( "Pop" );
|
|
popBtn.addActionListener( new ActionListener()
|
|
{
|
|
public void actionPerformed( ActionEvent e )
|
|
{
|
|
try
|
|
{
|
|
status.setText( "Popped: " + s.pop() );
|
|
}
|
|
catch ( EmptyStackException exception )
|
|
{
|
|
status.setText( exception.toString() );
|
|
}
|
|
}
|
|
} );
|
|
c.add( popBtn );
|
|
|
|
JButton peekBtn = new JButton( "Peek" );
|
|
peekBtn.addActionListener( new ActionListener()
|
|
{
|
|
public void actionPerformed( ActionEvent e )
|
|
{
|
|
try
|
|
{
|
|
status.setText( "Top: " + s.peek() );
|
|
}
|
|
catch ( EmptyStackException exception )
|
|
{
|
|
status.setText( exception.toString() );
|
|
}
|
|
}
|
|
} );
|
|
c.add( peekBtn );
|
|
|
|
JButton emptyBtn = new JButton( "Is Empty?" );
|
|
emptyBtn.addActionListener( new ActionListener()
|
|
{
|
|
public void actionPerformed( ActionEvent e )
|
|
{
|
|
status.setText( s.empty() ? "Stack is empty" : "Stack is not empty" );
|
|
}
|
|
} );
|
|
c.add( emptyBtn );
|
|
|
|
JButton searchBtn = new JButton( "Search" );
|
|
searchBtn.addActionListener( new ActionListener()
|
|
{
|
|
public void actionPerformed( ActionEvent e )
|
|
{
|
|
String searchKey = input.getText();
|
|
int result = s.search( searchKey );
|
|
|
|
if ( result == -1 )
|
|
status.setText( searchKey + " not found" );
|
|
else
|
|
status.setText( searchKey + " found at element " + result );
|
|
}
|
|
} );
|
|
c.add( searchBtn );
|
|
|
|
JButton displayBtn = new JButton( "Display" );
|
|
displayBtn.addActionListener( new ActionListener()
|
|
{
|
|
public void actionPerformed( ActionEvent e )
|
|
{
|
|
Enumeration enum = s.elements();
|
|
StringBuffer buf = new StringBuffer();
|
|
|
|
while ( enum.hasMoreElements() )
|
|
buf.append( enum.nextElement() ).append( " " );
|
|
|
|
JOptionPane.showMessageDialog( null, buf.toString(), "Display", JOptionPane.PLAIN_MESSAGE );
|
|
}
|
|
} );
|
|
c.add( displayBtn );
|
|
c.add( status );
|
|
|
|
setSize( 675, 100 );
|
|
show();
|
|
}
|
|
|
|
public static void main( String args[] )
|
|
{
|
|
StackTest app = new StackTest();
|
|
|
|
app.addWindowListener( new WindowAdapter()
|
|
{
|
|
public void windowClosing( WindowEvent e )
|
|
{
|
|
System.exit( 0 );
|
|
}
|
|
} );
|
|
}
|
|
}
|