What is the value of z after the third statement executes below?
StaticExample a = new StaticExample(5);StaticExample b = new StaticExample(12);
int z = a.incr( );
a) 5
b) 6
c) 12
d) 13
e) none, the code is syntactically invalid because a and b are attempting to share an instance data
Use the following class definition:
public class StaticExample
{
private static int x;
public StaticExample (int y)
{
x = y;
}
public int incr( )
{
x++;
return x;
}
}
Answer: d.
Explanation: Since instance data x is shared between a and b, it is first initialized to 5, it is then changed to 12 when b is instantiated, and then it is incremented to 13 when a.incr( ) is performed. So, incr returns the value 13.