GRAPHICAL USER INTERFACE (GUI) AND OBJECT-ORIENTED DESIGN (OOD) - Java Programming: From Problem Analysis to Program Design - page 375

EXAMPLE 6-4

//Programm illustrating autoboxing and -unboxing
//of Integer objects.

public class IntegerClassExample
{

public static void main(String[] args)
{

int x, y; //Line 1

Integer num1, num2; //Line 2

num1 = 8; //Autobox 8 //Line 3

num2 = 16; //Autobox 16 //Line 4

System.out.println("Line 5: num1 = " + num1
+ ", num2 = " + num2);

6

//Line 5

x = num1 + 4; //Line 6

System.out.println("Line 7: x = " + x); //Line 7

y = num1 + num2; //Line 8

System.out.println("Line 9: y = " + y); //Line 9

System.out.println("Line 10: The value of "
+ "2 * num1 + num2 = "
+ (2 * num1 + num2)); //Line 10

System.out.println("Line 11: The value of "
+ "x * num2 - num1 = "
+ (x * num2 - num1)); //Line 11

System.out.println("Line 12: The value of "
+ "num1 <= num2 is "
+ (num1 <= num2)); //Line 12

System.out.println("Line 13: The value of "
+ "2 * num1 <= x is "
+ (2 * num1 <= x)); //Line 13

System.out.println("Line 14: The value of "
+ "2 * num1 >= num2 is "
+ (2 * num1 >= num2)); //Line 14

}

}
Sample Run:

Line 5: num1 = 8, num2 = 16
Line 7: x = 12