CSCI 217: Advanced Programming
Lab 02
1
Constructor
• Same as method.
• Called when an instance
of class is created.
• Used to initialize the object.
• Its name should be same
as class name.
2
UML Diagram
3
UML Class Diagram
4
This Keyword
• Reference variable
• Refer to the current object
class Test
{
int a;
int b;
Test(int a, int b)
{
this.a = a;
this.b = b;
}
a=10
b=20
void display()
{
System.out.println("a = " + a + "
}
b = " + b);
public static void main(String[] args)
{
Test object = new Test(10, 20);
object.display();
}
}
5
class Test
{
int a;
int b;
Test()
{
a = 10;
b = 20;
}
a=10
b=20
Test get()
{
return this;
}
void display()
{
System.out.println("a = " + a + "
}
b = " + b);
public static void main(String[] args)
{
Test object = new Test();
object.get().display();
}
}
6
Static
•
•
•
•
Static Blocks
Static Methods
Static Class
Static Variable
7
Task1.1 trace:
8
Task1.2 trace:
Static Method
9
Task2:
10