IOapalooza8.java

/*
    IOapalooza8.java
    CIS 260
    David Klick
    2006-01-18

This program demonstrates output formatting using
    the new System.out.printf() method and the associated
    Formatter class.
*/

import java.util.Formatter;
import java.util.Calendar;
import java.util.Date;

public class IOapalooza8 {
    public static void main(String[] args) {
        int n = 123;
        double x = 123.456789;
        boolean b = true;
        String s = "Hello, world!";
        char c1 = 'a', c2 = 'b', c3 = 'c';
        Date date = new Date();
      
        // demonstration of printf method
        System.out.printf("*\n");
        System.out.printf("n = %d\n", n);            // decimal integer
        System.out.printf("n = %5d\n", n);           //    5 positions
        System.out.printf("n = %05d\n", n);          //    0 fill on left
        System.out.printf("n = %5o (octal)\n", n);   // octal, 5 wide
        System.out.printf("n = %05o (octal)\n", n);  //    0 fill on left
        System.out.printf("n = %#5o (octal)\n", n);  //    print leading 0
        System.out.printf("n = %5x (hex)\n", n);     // hex, 5 wide (lowercase)
        System.out.printf("n = %05X (hex)\n", n);    //    0 fill on left (uppercase)
        System.out.printf("n = %#5X (hex)\n", n);    //    print leading 0X
        System.out.printf("n = %#5x (hex)\n", n);    //    print leading 0x
        System.out.printf("n = %-5X (hex)\n", n);    //    left justify

System.out.printf("**\n");
        System.out.printf("x = %e\n", x);            // scientific notation
        System.out.printf("x = %E\n", x);            //    uppercase 'E'
        System.out.printf("x = %f\n", x);            // floating-point
        System.out.printf("x = %G\n", x);            // either E or f
        System.out.printf("x = %.2E\n", x);          // 2 positions after decimal
        System.out.printf("x = %a\n", x);            // output float as hex (lowercase)
        System.out.printf("x = %A\n", x);            // output float as hex (uppercase) 
        System.out.printf("x = %(f,  -x =  %(f\n", x, -x); // output negative in parens
        System.out.printf("%,d\n", 1234567);         // add ',' as separator

System.out.printf("***\n");
        System.out.printf("%b %B\n", b, b);  // boolean
        System.out.printf("%s  %S  %h  %H\n", s, s, s, s); // strings (upper, lower, hashcodes)
        System.out.printf("%3$c %1$c %2$c %1$c \n", c1, c2, c3); // char and positional specifiers

System.out.printf("****\n");
        System.out.printf("tc: %tc\n", date);  // full date format
        System.out.printf("tF: %tF\n", date);  // yyyy-mm-dd
        System.out.printf("tD: %tD\n", date);  // mm/dd/yy
        System.out.printf("tm: %tm\n", date);  // month (01-31)
        System.out.printf("te: %te\n", date);  // day (1-31)
        System.out.printf("td: %td\n", date);  // day (01-31)
        System.out.printf("tY: %tY\n", date);  // yyyy
        System.out.printf("ty: %ty\n", date);  // yy
        System.out.printf("TC: %TC\n", date);  // int(year/100)
        System.out.printf("tB: %tB\n", date);  // long month name
        System.out.printf("tb: %tb\n", date);  // short month name
        System.out.printf("tj: %tj\n", date);  // Julian day of year
        System.out.printf("tA: %tA\n", date);  // long day name
        System.out.printf("ta: %ta\n", date);  // short day name

System.out.printf("*****\n");
        System.out.printf("tr: %tr\n", date);  // hh:mm:ss ?M (12 hour format)
        System.out.printf("tR: %tR\n", date);  // hh:mm       (24 hour format)
        System.out.printf("tT: %tT\n", date);  // hh:mm:ss    (24 hour format)
        System.out.printf("tH: %tH\n", date);  // hh   (00-23)
        System.out.printf("tI: %tI\n", date);  // hh   (01-12)
        System.out.printf("tk: %tk\n", date);  // hour (0-23)
        System.out.printf("tL: %tL\n", date);  // milliseconds (000-999)
        System.out.printf("tN: %tN\n", date);  // nanoseconds (000000000-999999999)
        System.out.printf("tl: %tl\n", date);  // hour (1-12)
        System.out.printf("tM: %tM\n", date);  // minute (00-59)
        System.out.printf("tS: %tS\n", date);  // seconds (00-59)
        System.out.printf("ts: %ts\n", date);  // seconds since 1/1/1970
        System.out.printf("tQ: %tQ\n", date);  // milliseconds since 1/1/1970
        System.out.printf("tZ: %tZ\n", date);  // time zone
        System.out.printf("tz: %tz\n", date);  // offset from GMT
        System.out.printf("Tp: %Tp\n", date);  // AM/PM
        System.out.printf("tp: %tp\n", date);  // am/pm

System.out.printf("*****\n");
        // Formatter class
        Formatter fmt = new Formatter();
        fmt.format("%2$3.2f  %1$04d\n", n, x); 
        System.out.print(fmt.toString());
        // String class format method
        String sOut = String.format("%2$3.2f  %1$04d\n", n, x);
        System.out.print(sOut);
    }
}