int size = 7;
System.out.printf("Perfect: %8.3f %n", size );

Answer:

No. The format specifier does not match the data type. The error will be detected at run-time.

Left Justification

public class LeftJust
{
  public static void main ( String[] args )
  {
    double x = 12.34, y = -6.95, z = 1024;
    System.out.printf("x:%8.3f, y:%8.3f, z:%8.3f%n", x, y, z);  // default right justification
    System.out.printf("x:%-8.3f, y:%-8.3f, z:%-8.3f%n%n", x, y, z);  // left justification
    
    int a = 12, b = 12345, c = -1234567;
    System.out.printf("a:%10d; b:%10d; c:%10d%n", a, b, c);  // default right justification
    System.out.printf("a:%-10d; b:%-10d; c:%-10d%n", a, b, c);  // left justification
  }
}

To left justify values, put a minus sign (-) after the percent sign. This works for all format specifiers. The output of the above program:

x:  12.340, y:  -6.950, z:1024.000
x:12.340  , y:-6.950  , z:1024.000

a:        12; b:     12345; c:  -1234567
a:12        ; b:12345     ; c:-1234567

QUESTION 5:

What do you suspect the following prints?

String wizard = "Gandalf";
System.out.printf("|%15s|%n", wizard );
System.out.printf("|%-15s|%n", wizard );