CS计算机代考程序代写 Java /******************************************************************************

/******************************************************************************
* Compilation: javac StdOut.java
* Execution: java StdOut
* Dependencies: none
*
* Writes data of various types to standard output.
*
******************************************************************************/

import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.util.Locale;

/**
* This class provides methods for printing strings and numbers to standard output.
*

* Getting started.
* To use this class, you must have {@code StdOut.class} in your
* Java classpath. If you used our autoinstaller, you should be all set.
* Otherwise, either download
* stdlib.jar
* and add to your Java classpath or download
* StdOut.java
* and put a copy in your working directory.
*

* Here is an example program that uses {@code StdOut}:
*

 *   public class TestStdOut {
 *       public static void main(String[] args) {
 *           int a = 17;
 *           int b = 23;
 *           int sum = a + b;
 *           StdOut.println("Hello, World");
 *           StdOut.printf("%d + %d = %d\n", a, b, sum);
 *       }
 *   }
 *  

*

* Differences with System.out.
* The behavior of {@code StdOut} is similar to that of {@link System#out},
* but there are a few technical differences:
*

    *

  • {@code StdOut} coerces the character-set encoding to UTF-8,
    * which is a standard character encoding for Unicode.
    *

  • {@code StdOut} coerces the locale to {@link Locale#US},
    * for consistency with {@link StdIn}, {@link Double#parseDouble(String)},
    * and floating-point literals.
    *

  • {@code StdOut} flushes standard output after each call to
    * {@code print()} so that text will appear immediately in the terminal.
    *

*

* Reference.
* For additional documentation,
* see Section 1.5 of
* Computer Science: An Interdisciplinary Approach
* by Robert Sedgewick and Kevin Wayne.
*
* @author Robert Sedgewick
* @author Kevin Wayne
*/
public final class StdOut {

// force Unicode UTF-8 encoding; otherwise it’s system dependent
private static final String CHARSET_NAME = “UTF-8”;

// assume language = English, country = US for consistency with StdIn
private static final Locale LOCALE = Locale.US;

// send output here
private static PrintWriter out;

// this is called before invoking any methods
static {
try {
out = new PrintWriter(new OutputStreamWriter(System.out, CHARSET_NAME), true);
}
catch (UnsupportedEncodingException e) {
System.out.println(e);
}
}

// don’t instantiate
private StdOut() { }

/**
* Terminates the current line by printing the line-separator string.
*/
public static void println() {
out.println();
}

/**
* Prints an object to this output stream and then terminates the line.
*
* @param x the object to print
*/
public static void println(Object x) {
out.println(x);
}

/**
* Prints a boolean to standard output and then terminates the line.
*
* @param x the boolean to print
*/
public static void println(boolean x) {
out.println(x);
}

/**
* Prints a character to standard output and then terminates the line.
*
* @param x the character to print
*/
public static void println(char x) {
out.println(x);
}

/**
* Prints a double to standard output and then terminates the line.
*
* @param x the double to print
*/
public static void println(double x) {
out.println(x);
}

/**
* Prints an integer to standard output and then terminates the line.
*
* @param x the integer to print
*/
public static void println(float x) {
out.println(x);
}

/**
* Prints an integer to standard output and then terminates the line.
*
* @param x the integer to print
*/
public static void println(int x) {
out.println(x);
}

/**
* Prints a long to standard output and then terminates the line.
*
* @param x the long to print
*/
public static void println(long x) {
out.println(x);
}

/**
* Prints a short integer to standard output and then terminates the line.
*
* @param x the short to print
*/
public static void println(short x) {
out.println(x);
}

/**
* Prints a byte to standard output and then terminates the line.
*

* To write binary data, see {@link BinaryStdOut}.
*
* @param x the byte to print
*/
public static void println(byte x) {
out.println(x);
}

/**
* Flushes standard output.
*/
public static void print() {
out.flush();
}

/**
* Prints an object to standard output and flushes standard output.
*
* @param x the object to print
*/
public static void print(Object x) {
out.print(x);
out.flush();
}

/**
* Prints a boolean to standard output and flushes standard output.
*
* @param x the boolean to print
*/
public static void print(boolean x) {
out.print(x);
out.flush();
}

/**
* Prints a character to standard output and flushes standard output.
*
* @param x the character to print
*/
public static void print(char x) {
out.print(x);
out.flush();
}

/**
* Prints a double to standard output and flushes standard output.
*
* @param x the double to print
*/
public static void print(double x) {
out.print(x);
out.flush();
}

/**
* Prints a float to standard output and flushes standard output.
*
* @param x the float to print
*/
public static void print(float x) {
out.print(x);
out.flush();
}

/**
* Prints an integer to standard output and flushes standard output.
*
* @param x the integer to print
*/
public static void print(int x) {
out.print(x);
out.flush();
}

/**
* Prints a long integer to standard output and flushes standard output.
*
* @param x the long integer to print
*/
public static void print(long x) {
out.print(x);
out.flush();
}

/**
* Prints a short integer to standard output and flushes standard output.
*
* @param x the short integer to print
*/
public static void print(short x) {
out.print(x);
out.flush();
}

/**
* Prints a byte to standard output and flushes standard output.
*
* @param x the byte to print
*/
public static void print(byte x) {
out.print(x);
out.flush();
}

/**
* Prints a formatted string to standard output, using the specified format
* string and arguments, and then flushes standard output.
*
*
* @param format the format string
* @param args the arguments accompanying the format string
*/
public static void printf(String format, Object… args) {
out.printf(LOCALE, format, args);
out.flush();
}

/**
* Prints a formatted string to standard output, using the locale and
* the specified format string and arguments; then flushes standard output.
*
* @param locale the locale
* @param format the format string
* @param args the arguments accompanying the format string
*/
public static void printf(Locale locale, String format, Object… args) {
out.printf(locale, format, args);
out.flush();
}

/**
* Unit tests some of the methods in {@code StdOut}.
*
* @param args the command-line arguments
*/
public static void main(String[] args) {

// write to stdout
StdOut.println(“Test”);
StdOut.println(17);
StdOut.println(true);
StdOut.printf(“%.6f\n”, 1.0/7.0);
}

}