Out.java

Below is the syntax highlighted version of Out.java from §8.4 Operating Systems.

/******************************************************************************
 *  Compilation:  javac Out.java
 *  Execution:    java Out
 *
 *  Writes data of various types to: stdout, file, or socket.
 *
 ******************************************************************************/


import java.io.IOException;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.Socket;

public class Out {
    private PrintWriter out;

    // for stdout
    public Out(OutputStream os) { out = new PrintWriter(os, true); }
    public Out()                { this(System.out);                }

    // for Socket output
    public Out(Socket socket) {
        try                     { out = new PrintWriter(socket.getOutputStream(), true); }
        catch (IOException ioe) { ioe.printStackTrace();                                 }
    }

    // for file output
    public Out(String s) {
        try                     { out = new PrintWriter(new FileOutputStream(s), true);  }
        catch(IOException ioe)  { ioe.printStackTrace();                                 }
    }

    public void close() { out.close(); }


    public void println()          { out.println();  out.flush(); }
    public void println(Object x)  { out.println(x); out.flush(); }
    public void println(boolean x) { out.println(x); out.flush(); }
    public void println(char x)    { out.println(x); out.flush(); }
    public void println(double x)  { out.println(x); }
    public void println(float x)   { out.println(x); }
    public void println(int x)     { out.println(x); }
    public void println(long x)    { out.println(x); }

    public void print()            {                 out.flush(); }
    public void print(Object x)    { out.print(x);   out.flush(); }
    public void print(boolean x)   { out.print(x);   out.flush(); }
    public void print(char x)      { out.print(x);   out.flush(); }
    public void print(double x)    { out.print(x);   out.flush(); }
    public void print(float x)     { out.print(x);   out.flush(); }
    public void print(int x)       { out.print(x);   out.flush(); }
    public void print(long x)      { out.print(x);   out.flush(); }


    // This method is just here to test the class
    public static void main (String[] args) {
        Out out;
        String s;

        // write to stdout
        out = new Out();
        out.println("Test 1");
        out.close();

        // write to a file
        out= new Out("test.txt");
        out.println("Test 2");
        out.close();
    }

}