USER-DEFINED CLASSES AND ADTS - Java Programming: From Problem Analysis to Program Design - page 505

After this statement executes, the objects and static members are as shown in Figure 8-17.

y 1
count 2

illusObject1 x 3 illusObject2 x 5

FIGURE 8-17 illusObject1 and illusObject2 after the statement Illustrate.count++;
executes

The output of the statements:
System.out.println(illusObject1);
System.out.println(illusObject2);
is:

x = 3, y = 1, count = 2
x = 5, y = 1, count = 2
The program in Example 8-7 further illustrates how static members of a class work.

8

EXAMPLE 8-7

public class StaticMembers
{

public static void main(String[] args)
{

Illustrate illusObject1 = new Illustrate(3); //Line 1

Illustrate illusObject2 = new Illustrate(5); //Line 2

Illustrate.incrementY(); //Line 3

Illustrate.count++; //Line 4

System.out.println("Line 5: illusObject1: "
+ illusObject1); //Line 5

System.out.println("Line 6: illusObject2: "
+ illusObject2); //Line 6

System.out.println("Line 7: ***Increment y "
+ "using illusObject1***");

//Line 7

illusObject1.incrementY(); //Line 8

illusObject1.setX(8); //Line 9

System.out.println("Line 10: illusObject1: "
+ illusObject1); //Line 10