CIS 260 TestPrintf.java

Code

/*
    TestPrintf.java
    David Klick
    CIS 260
    2005-01-19

    Demonstrates formatted output using java.util.Formatter
    and the printf method of PrintStream.
*/

import java.util.Formatter;

public class TestPrintf {
    public static void main(String[] args) {
        Formatter f = new Formatter();

        // separate steps
        f.format("Hello, world!");
        System.out.println(f);

        // like above, but two steps combined in each line
        // notice how results keep getting appended to last results
        System.out.println(f.format("%5d**", 9));
        System.out.println(f.format("%7.2f**", 9.123));
        System.out.println(f.format("%-5d**", 9));
        System.out.println(f.format("%05d**", 9));
        System.out.println(f.format("%05o**", 9));

        // skipping overt use of Formatter and just using printf
        // notice how old results are cleared whenever we do a new conversion
        System.out.printf("%5x**\n", 42);
        System.out.printf("%5X**\n", 42);
        System.out.printf("Hi %s\n", "Dave");
        System.out.printf("%c\n", (char)75);
        System.out.printf("%d\n", (int)'d');
        System.out.printf("9 < 5 is %b\n", (9<5));
        System.out.printf("%2$d  %d  %d  %d\n", 1, 2, 3, 4);
    }
}
/*
    Output from program:

    Hello, world!
    Hello, world!    9**
    Hello, world!    9**   9.12**
    Hello, world!    9**   9.12**9    **
    Hello, world!    9**   9.12**9    **00009**
    Hello, world!    9**   9.12**9    **00009**00011**
       2a**
       2A**
    Hi Dave
    K
    100
    9 < 5 is false
    2  1  2  3
*/