CSC300 / CSC402: Formatting Output [10/11]

java.util.Formatter describes formatting conventions.

It's not necessary to use the Formatter class directly.

The Formatter.format() method is used by StdOut.format(), String.format(), and similar methods.

package algs11;
import stdlib.*;
import java.util.Arrays;
public class Hello {
  public static void main (String[] args) {
    double d = Math.PI;
    int i = Integer.MAX_VALUE;
    double[] lst = { 11, 21, 31 };
    StdOut.format ("d=%f, i=%d\nlst=%s%n", d, i, Arrays.toString(lst));
  }
}

StdOut.format takes a variable number of arguments.

• The first argument is the format string, which may include format specifiers, which begin with %.
• There is then one argument for each format specifier. The types must match.
• %f is used for doubles (and floats)
• %d is used for ints (and longs)
• %s is used for Strings
• \n and %n represent the newline character