How to Create Methods in Java

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How to Create Methods in Java

In object-oriented programming, methods define the behavior of objects. They specify the actions you may do on a specific object.

In structured programming, methods are analogous to functions. The distinction (and their benefit) is that methods enable code reuse and software modularity.

You may have either library methods or user-defined methods in Java. Your Java installation includes library methods. Continue reading to learn how to develop user-defined methods.

Declaring a Method

You must have defined a method before you may use it. To accomplish so, use the following syntax:

return_type methodName( param1, param2, paramN){

}

In its simplest form, a method takes on the above format.

The return type specifies the data type that the procedure should return after execution. This value may be of any data type, including int, String, or double, among others.

This field may also accept a specific type called void. Using void indicates that you do not want your method to return anything once it has been executed.

In your method block, use the term return to indicate the value you will return:

int deposit (int value){

return balance;
}

If you leave out what you are returning in your method body while your method header indicates that you plan to return anything, you will receive a compilation error.

The method body is the section of the method that extends from the left brace to the right brace. The method header is the component of your method declaration that does not include the braces,

return_type methodName( param1, param2, paramN) 

methodName is an identifier that is used to identify a method. Lower camelCase is used by convention. That is, the first word is lowercase, while the first letter of the second word is capitalized if it is a two-part word.

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It’s also worth noting that you can’t use any of the reserved Java vocabulary as method names.

The round brackets of the method header are used to define the parameter list. A parameter list defines a list of parameters separated by commas. A parameter is a two-part value consisting of a data type followed by a variable name.

It is also possible not to include any parameters in your parameter list. In this case, the compiler will just run the method block with no parameter expectation.

int balance (){

return amount;
}

A method can also have two other fields, preceding thereturn type in the method header. See the example below:

public static void main(){
}

The keyword publicis a visibility modifier and you can apply it to any method you define so as to limit its accessibility. Public means that the method can be accessed by all classes in all packages.

There are also other visibility modifiers like protected, private, and default. An in-depth discussion of visibility modifiers is given in the related link:

Related:The Different Java Access Modifiers Explained

The keyword staticindicates that a method has a class scope. This means that the method is not an instance method and is therefore run whenever the program is loaded into memory without the need for instantiation. The importance of having a static method is to enable the compiler to know which method to start with during execution.

Generally, your program will have one static method (called main()) from which you can call other methods.

Calling a Method

In order for your declared method to perform an action on an object, it needs to be “called.”

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To call a method, use the syntax:

ObjectName.methodName(arguments)

An argument is a value that you pass on in the field where you declared a parameter. Ensure that the argument type matches that declared in the method header. Otherwise, you will get a compilation error.

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Below is a completely functional example code that demonstrates how to put everything you’ve learnt to use. It employs techniques for applying an interest rate to a deposited amount as well as displaying a bank message.

public class Account{
double deposit(double amount){
amount = amount*1.05;
return amount;
}
void getMessage(){
System.out.println("Thank you for banking with us!");
}
public static void main(String[] args){
Account myAccount = new Account();
double newBalance = myAccount.deposit(500);
System.out.println("
Your new balance in 4 months will be "+ newBalance);
myAccount.getMessage();
}
}

Now You Know How to Create Methods in Java

Anyone interested in becoming more serious about programming should learn how to construct methods in Java. And now that you know how, you’ll save a lot of time while working.

After you’ve mastered this ability, why not check out some more Java-related hints and tricks?

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