Functions in Java
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Methods
Methods in
Java are the same as functions in other programming languages. It will execute a
block of code whenever it is being called.
Syntax
--Declaring a
method ---
Datatype
methodname(){
//block of
code
}
--calling a
method--
methodname()
Types
of Methods
1.
Method with parameter without return type.
2.
Method without parameter without return type.
3.
Method with parameter with return type.
4.
Method without parameter with return type.
Parameters
and Arguments
They are the
values passed during the program's run time.
Java
Scope
In Java, variables are only accessible inside
the region they are created. This is called scope.
Note:
static
method, which means that it can be accessed without creating an object of the
class, unlike public, which can only be accessed by objects
Example 01: Method with parameter without return type.
package Methods;
public class method2 {
public static void add(int a, int b) {
int s = a;
int p = b;
int c = s+p;
System.out.println(c);
}
public static void main(String[] args) {
add(50,20);
}
}
Example 02: Method with parameter with return type.
package Methods;
public class method_3 {
static int add(int c, int d) {
return c+d;
}
public static void main(String args[]) {
int m = add(20,30);
System.out.println(m);
}
}
Example 03: Method without parameter without return type
package Methods;
class Methods {
//Method without parameter without return type
public void add() {
int a = 123;
int b = 10;
System.out.println("Addition : " + (a + b));
}
//Method with parameter without return type.
public void sub(int x, int y) {
System.out.println("Subtraction : " + (x - y));
}
//Method without parameter with return type.
public int mul() {
int a = 123;
int b = 10;
return a * b;
}
//Method with parameter with return type
public float div(int x, int y) {
return (x / y);
}
//Recursion Function
public int factorial(int n)//5! =1*2*3*4*5=120
{
if(n==1)
return 1;
else
return (n*factorial(n-1));
}
}
//Type of User Define Methods in Java
public class functions {
public static void main(String args[]) {
Methods o = new Methods();
o.add();
o.sub(123, 10);
System.out.println("Muli : "+o.mul());
System.out.println("Division : "+o.div(123,10));
}
}
Labels: Java
