import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.WindowConstants;
import java.awt.FlowLayout;
import java.awt.Dimension;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
 
public class jFrame1 extends JFrame {
 
	private JTextField jTextField1;
    private jFrame2 jf2 = new jFrame2();
 
    public jFrame1() {
        iniciarInterfaz();
    }
 
    private void iniciarInterfaz() {
 
        jTextField1 = new javax.swing.JTextField();
 
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setTitle("jFrame1");
        setResizable(false);
        setVisible(true);
        getContentPane().setLayout(new FlowLayout());
 
        jTextField1.setText("escribe algo y oprime enter");
        jTextField1.setPreferredSize(new Dimension(200, 25));
        jTextField1.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent evt) {
               eventJTextField();
            }
        });
        getContentPane().add(jTextField1);
 
        pack();
    }
 
    private void eventJTextField() {
        jf2.setVisible(true);
        jf2.setText(jTextField1.getText());
    }
 
    public static void main(String args[]) {
        new jFrame1();
    }
 
}
 
 

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.WindowConstants;
import java.awt.FlowLayout;
import java.awt.Dimension;
 
public class jFrame2 extends JFrame {
 
	private JLabel jLabel1;
 
    public jFrame2() {
        initComponents();
    }
 
    private void initComponents() {
 
        jLabel1 = new JLabel();
 
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setTitle("jFrame2");
        setResizable(false);
        setLocation(50, 100);
        getContentPane().setLayout(new FlowLayout());
 
        jLabel1.setPreferredSize(new Dimension(200, 25));
 
        getContentPane().add(jLabel1);
 
        pack();
    }
 
    public void setText(String text) {
        jLabel1.setText(text);
    }
}
 
 

package com.foro;
import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
 
import javax.print.Doc;
import javax.print.DocFlavor;
import javax.print.DocPrintJob;
import javax.print.PrintException;
import javax.print.PrintService;
import javax.print.PrintServiceLookup;
import javax.print.SimpleDoc;
 
 
public class printWithoutDialog {
 
	public static void main(String[] args)	{
		new printWithoutDialog();
	}
 
	public printWithoutDialog(){
		try { 
			// Open the image file 
			InputStream is = new BufferedInputStream( 
					new FileInputStream("C:\\duke.gif")); 
 
			// Find the default service 
			DocFlavor flavor = DocFlavor.INPUT_STREAM.GIF; 
			PrintService service = PrintServiceLookup.lookupDefaultPrintService(); 
 
			// Create the print job 
			DocPrintJob job = service.createPrintJob(); 
			Doc doc = new SimpleDoc(is, flavor, null); 
 
			// Monitor print job events; for the implementation of PrintJobWatcher, 
			// see Determining When a Print Job Has Finished  
			PrintJobWatcher pjDone = new PrintJobWatcher(job); 
 
			// Print it 
			job.print(doc, null); 
 
			// Wait for the print job to be done 
			pjDone.waitForDone(); 
 
			// It is now safe to close the input stream 
			is.close(); 
		} catch (PrintException e) { 
 
		} catch (IOException e) { } 
	}
 
}
 

package com.foro;
import javax.print.DocPrintJob;
import javax.print.event.PrintJobAdapter;
import javax.print.event.PrintJobEvent;
 
 
public class PrintJobWatcher {
	// true if it is safe to close the print job's input stream 
	boolean done = false; PrintJobWatcher(DocPrintJob job) { 
 
		// Add a listener to the print job 
		job.addPrintJobListener(new PrintJobAdapter() { 
			public void printJobCanceled(PrintJobEvent pje) { 
				allDone(); 
			} 
 
			public void printJobCompleted(PrintJobEvent pje) { 
				allDone(); 
			} 
 
			public void printJobFailed(PrintJobEvent pje) { 
				allDone(); 
			} 
 
			public void printJobNoMoreEvents(PrintJobEvent pje) { 
				allDone(); 
			} 
 
			void allDone() { 
				synchronized (PrintJobWatcher.this) { 
					done = true; PrintJobWatcher.this.notify(); 
				} 
			} 
		}); 
	} 
 
	public synchronized void waitForDone() { 
		try { 
			while (!done) { 
				wait(); 
			} 
		} catch (InterruptedException e) { 
		} 
	} 
 
}
 

 
int n = 0;
 while ( n > 0 ) System.out.println("Esto nunca lo verás");
 

boolean prueba = true;
  while ( prueba ) {
        System.out.println("Esto lo verás una vez");
        prueba = false;
  }
 

boolean prueba = true;
  while ( prueba ) {
        System.out.println("Esto lo verás muchas veces");
  }
 

while(n--)