PrintWriter

PrintWriter printf(String fmtString, Object ... args) 
PrintWriter printf(Locale loc, String fmtString, Object ... args)

import java.io.PrintWriter;
//ja  v a2 s . c  o  m
public class Main {

  public static void main(String args[]) throws Exception {

    PrintWriter pw = new PrintWriter(System.out);

    pw.println(true);
    pw.println('A');
    pw.println(500);
    pw.println(40000L);
    pw.println(45.67f);
    pw.println(45.67);
    pw.println("Hello");
    pw.println(new Integer("99"));

    pw.close();
  }
}

true/*from  j  av a  2  s .  co m*/
A
500
40000
45.67
45.67
Hello
99

import java.io.FileWriter;
import java.io.PrintWriter;
/*from   j  a  va 2s.co  m*/
public class Main {
  public static void main(String[] args) throws Exception {
    String filename = "fileName.txt";
    String[] linesToWrite = new String[] { "a", "b" };
    boolean appendToFile = true;

    PrintWriter pw = null;
    if (appendToFile) {
      pw = new PrintWriter(new FileWriter(filename, true));
    } else {
      pw = new PrintWriter(new FileWriter(filename));
    }
    for (int i = 0; i < linesToWrite.length; i++) {
      pw.println(linesToWrite[i]);
    }
    pw.flush();
    pw.close();
  }
}

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.PrintWriter;
/*from   ja  v  a2  s  .c o  m*/
public class MainClass {

  public static void main(String args[]) {

    try {

      // Create a print writer
      FileWriter fw = new FileWriter(args[0]);
      BufferedWriter bw = new BufferedWriter(fw);
      PrintWriter pw = new PrintWriter(bw, false);

      // Experiment with some methods
      pw.println(true);
      pw.println('A');
      pw.println(500);
      pw.println(40000L);
      pw.println(45.67f);
      pw.println(45.67);
      pw.println("Hello");
      pw.println(new Integer("99"));

      // Close print writer
      pw.close();
    } catch (Exception e) {
      System.out.println("Exception: " + e);
    }
  }
}

/*//from  j  av a 2  s.  c  o m
 * JBoss, Home of Professional Open Source
 * Copyright 2005, JBoss Inc., and individual contributors as indicated
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

import java.io.IOException;
import java.io.InterruptedIOException;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.io.Writer;

/**
 * A <tt>PrintWriter</tt> that ends lines with a carriage return-line feed (<tt>CRLF</tt>).
 * 
 * <h3>Concurrency</h3>
 * This class is <b>as</b> synchronized as <tt>PrintWriter</tt>.
 * 
 * @version <tt>$Revision: 1958 $</tt>
 * @author <a href="mailto:jason@planet57.com">Jason Dillon</a>
 */
public class CRLFPrintWriter extends PrintWriter {
  protected boolean autoFlush = false;

  public CRLFPrintWriter(final Writer out) {
    super(out);
  }

  public CRLFPrintWriter(final Writer out, final boolean autoFlush) {
    super(out, autoFlush);
    this.autoFlush = autoFlush;
  }

  public CRLFPrintWriter(final OutputStream out) {
    super(out);
  }

  public CRLFPrintWriter(final OutputStream out, final boolean autoFlush) {
    super(out, autoFlush);
    this.autoFlush = autoFlush;
  }

  protected void ensureOpen() throws IOException {
    if (out == null)
      throw new IOException("Stream closed");
  }

  public void println() {
    try {
      synchronized (lock) {
        ensureOpen();

        out.write("\r\n");

        if (autoFlush) {
          out.flush();
        }
      }
    } catch (InterruptedIOException e) {
      Thread.currentThread().interrupt();
    } catch (IOException e) {
      setError();
    }
  }
}