In this tutorial basic introduction to Class and its Elements such as Constructors and How to perform Function Overloading in Core Java is shown.
Code:
Demo.java
class Number
{
int a,b;
static int count=0;
public final static String str=”Hello”;
Number()
{
a=b=0;
counter();
}
Number(int x)
{
a=b=x;
counter();
}
Number(int a,int b)
{
this.a=a;
this.b=b;
counter();
}
public static void counter()
{
count++;
}
public static int getcount()
{
return count;
}
public void insert(int x)
{
a=b=x;
}
public void insert(int a,int b)
{
this.a=a;
this.b=b;
}
public void insert(Number n)
{
this.a=n.a;
this.b=n.b;
}
public void display()
{
System.out.println(“a: “+a);
System.out.println(“b: “+b);
}
protected void finalize()
{
System.out.println(“Finalize method”);
}
}
public class Demo
{
public static void main(String args[])
{
Number n1=new Number();
System.out.println(“No of Objects: “+Number.getcount());
Number n2=new Number(3);
System.out.println(“No of Objects: “+Number.getcount());
Number n3=new Number(4,5);
System.out.println(“No of Objects: “+Number.getcount());
System.out.println(“n1 data”);
n1.insert(5);
n1.display();
System.out.println(“n2 data”);
n2.insert(10,15);
n2.display();
System.out.println(“n3 data”);
n3.insert(12,20);
n3.display();
System.out.println(“n3 data after change”);
n3.insert(n2);
n3.display();
System.out.println(“String: “+ Number.str);
}
}
