Function in java
Function is defined as a bundle of code to perform a specific task. It will be executed, when it is called. It is used for code reusability and to reduce the lines of code.
Types of Function
- No argument no return type
- With argument no return type
- No argument with return type
- With argument with return type
1. No argument no return type
This type consists of no parameter and no return type.
Example
public class Main
{
public static void main(String[] args)
{
Main obj = new Main();
obj.science();
}
public void science()
{
System.out.print("physics");
}
}
Output
physics
2. With argument no return type
This type consists of parameter but no return type.
Example
public class Main
{
public static void main(String[] args)
{
Main obj = new Main();
obj.science(25);
}
public void science(int marks)
{
System.out.print("science marks:"+marks);
}
}
Output
science marks:25
3. No argument with return type
This type does not consists of parameter but contain return type.
Example
public class Main
{
public static void main(String[] args)
{
Main obj = new Main();
System.out.print("science marks:"+obj.science());
}
public int science()
{
int marks = 25;
return marks;
}
}
Output
science marks:25
4. With argument with return type
This type consists of both parameter and return type.
Example
public class Main
{
public static void main(String[] args)
{
Main obj = new Main();
System.out.print("science marks:"+obj.science(25));
}
public int science(int marks)
{
return marks;
}
}
Output
science marks:25