A method is a block of code that is use to perform certain actions. Method runs when it called. Method allow us to reuse the code.
Types of methods in Java
-
- Standard Library methods
- User defined methods
Standard Library Method
They are built-in Java methods are readily available to use. For example, sqrt() is a Method of Math and returns square root of a number.
User-defined Method
User can define a method inside a class as per his/her wish.
How to create a Method?
modifier returnType nameOfMethod (Parameter List) {
// method body }
Here,
- modifier − It defines the access type of the method and it is optional to us
- returnType − Method may return a value or not. Void does not return any value.
- nameOfMethod − This is the method name. The method signature consists of the method name and the parameter list.
- Parameter List − The list of parameters, it is the type, order, and number of parameters of a method. These are optional, method may contain zero parameters.
- method body − The method body defines what the method does with the statements.
public static int methodName(int a, int b) {
// body
}
public class Method_Example {
public static void main(String[] args) {
//Standard Library Method
System.out.println("Square root of 9 is : "+Math.sqrt(9));
//User defined Method
MyMethod();
}
public staticvoid MyMethod()
{
System.out.println("My User defined Method");
}
}
Output
Square root of 9 is: 3.0
My User defined Method
Java Methods with Arguments and Return Value
A Java method can have zero or more parameters, and they may return a value.
public class Min_Method {
public static void main(String[] args) {
int a = 10;
int b = 5;
int c = minMethod(a,b
System.out.println("Minimum value is :"+c);
}
//Define function min_function
public static int minMethod(int x, int y)
{
int min;
if (x>y)
min =y;
else
min = x;
//return value
return min;
}
}
Output
Minimum value is :5
Void Keyword
The void keyword allows us to create methods that do not return a value.
public class Min_Method {
public static void main(String[] args) {
int a = 10;
int b = 5;
//Call function
minMethod(a,b);
}
//Define function min_function
public static void minMethod(int x, int y)
{
intmin;
if(x>y)
min =y;
else
min = x;
System.out.println("Minimum value is :"+min);
}
}
Output
Minimum value is :5
Method Overloading
When a class has two or more methods by the same name but different parameters, it known as method overloading. To know more about method overloading, click
public class Overloading_Example {
public static void main(String[] args) {
int a= 10;
int b = 24;
double c = 12.0;
double d = 13.0;
min_function(a, b);
min_function(c,d);
}
public static void min_function(int x, int y)
{
int min;
if(x>y)
min = y;
else
min = x;
System.out.println("Minimum value for integer is :"+ min);
}
public static void min_function(double m, double n)
{
double min;
if(m>n)
min=n;
else
min=m;
System.out.println("Minimum value for integer is :"+ min);
}
}
Output
Minimum value for integer is :10
Minimum value for integer is :12.0
What is main method in Java?
The main()method is the entry point into the application. The signature of the method is always: public static void main(String[] args)
QA Automation Expert 
Good work..keep it up !!
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