Java Reference
In-Depth Information
4. 2 2
4
Note that
2 + " " + 2
contains a string, namely
" "
. So, Java knows it is supposed to produce a string.
On the other hand,
2 + 2
contains only integers. So Java thinks
+
denotes addition
in this second case and produces the value
4
to be output.
5 .
START1234567890
STARTJelly beansEND
STARTJelly beansEND
START Jelly beansEND
6. The last two of the following lines end with a blank. The last line begins with two
blanks, one that follows
%n
in the format string and one because the field width is
9
but the number to be output fills only eight spaces.
START1234567890
STARTJelly beansEND
123.1235
7 .
System.out.printf("%15.3e", d);
8 .
$1.23
$15.68
9. Either
import
java.awt.Robot;
or
import
java.awt.*;
10.
import
java.util.Scanner;
11.
Scanner frank =
new
Scanner(System.in);
12.
w = frank.next();
13.
import
java.util.Scanner;
public class
Exercise
{
public static void
main(String[] args)
{
Scanner keyboard =
new
Scanner(System.in);
System.out.println("Enter two numbers.");
int
n1 = keyboard.nextInt();
int
n2 = keyboard.nextInt();
int
sum = n1 + n2;
System.out.println(n1 + " plus " + n2 + " is " + sum);
}
}
