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Overloading varargs is import to solve real time problem in java programming. Students must know its use and its implimentation. By overloading concepts lots of real time banking problems solve with java programming. Java Programming Online Overloading play vital role. To understand the concept of Overloading below is defination concept with example: -
Just like normal methods, java provides facility to overload vararg methods also.

Example
class VaragOverload{

void print(int ... a){
for(int i=0; i < a.length; i++){
System.out.println(a[i]);
}
}

void print(boolean ... a){
for(int i=0; i < a.length; i++){
System.out.println(a[i]);
}
}

public static void main(String args[]){
VaragOverload obj = new VaragOverload();
obj.print(1,2,3);
obj.print(true, false, true);
}
}

Output
1
2
3
true
false
true

Ambiguity while using varargs
Consider the above example, there is a problem in that. Try to call the method “print” with no arguments, then compiler throws the error, since it can't differentiate which overloaded method, it should call.

Example
class VaragOverload{
void print(int ... a){
for(int i=0; i < a.length; i++){
System.out.println(a[i]);
}
}

void print(boolean ... a){
for(int i=0; i < a.length; i++){
System.out.println(a[i]);
}
}

public static void main(String args[]){
VaragOverload obj = new VaragOverload();

obj.print(1,2,3);
obj.print(true, false, true);
obj.print();
}
}

When you try to compile, compiler throws the below error
VaragOverload.java:20: error: reference to print is ambiguous, both method print(int...)
in VaragOverload and method print(boolean...) in VaragOverload match
obj.print();
^
1 error

 

Constructors
Constructors are used to initialize object at the time of creation.
syntax
modifier className(){
}

Here modifier is anything like private, public, protected, default. Will discuss more about modifiers in the packages section. As you see constructors don't have any return type and constructor name equals to the class name.

If you don't provide the constructor, then compiler provides the default constructor for your class.

Example
class Box{
int width,height;

Box(){
width = 10;
height = 10;
}

public static void main(String args[]){
Box b1 = new Box();
System.out.println(b1.width +"\t"+b1.height);
}
}

Output
10 10


As you see in the above program, Box() is initializing the properties for an object to 10 at the time of creation.

Overloading Constructors
Just like overloading methods, we can overload the constructors also.
Example
class Box{
int width,height;

Box(){
width = 0;
height = 0;
}

Box(int h){
width = height = h;
}

Box(int w, int h){
width = w;
height = h;
}

public static void main(String args[]){
Box b1 = new Box();
Box b2 = new Box(15);
Box b3 = new Box(15, 25);

System.out.println(b1.width +"\t"+b1.height);
System.out.println(b2.width +"\t"+b2.height);
System.out.println(b3.width +"\t"+b3.height);
}
}

Output
0 0
15 15
15 25

Some points to Remember
1. Can we make constructor and method with the same name ?
Yes, it is valid in Java
Example
class Box{
int width,height;

Box(){
width = 10;
height = 10;
}

void Box(){
System.out.println(width +"\t"+height);
}

public static void main(String args[]){
Box b1 = new Box();
System.out.println(b1.width +"\t"+b1.height);
}
}

Output
10 10

2. Can constructors throw exceptions ?
Yes, Constructors are like special methods in java.

Example
public Socket(String host,int port)throws UnknownHostException,IOException

Socket class in the java.net.Socket, throws UnknownHostException, if the IP address of the host could not be determined.

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