What is method in java

Examples and practices described in this page don't take advantage of improvements introduced in later releases and might use technology no longer available. Modifiers, return types, and parameters will be discussed later in this lesson. Exceptions are discussed in a later lesson. Although a method name can be any legal identifier, code conventions restrict method names.

By convention, method names should be a verb in lowercase or a multi-word name that begins with a verb in lowercase, followed by adjectives, nouns, etc. In multi-word names, the first letter of each of the second and following words should be capitalized.

Suppose you need to create a program to create a circle and color it. You can create two methods to solve this problem:. Dividing a complex problem into smaller chunks makes your program easy to understand and reusable. In the above example, the name of the method is adddNumbers.

And, the return type is int. We will learn more about return types later in this tutorial. This is the simple syntax of declaring a method. However, the complete syntax of declaring a method is. In the above example, we have declared a method named addNumbers. Now, to use the method, we need to call it. In the above example, we have created a method named addNumbers. The method takes two parameters a and b. Notice the line,. Here, we have called the method by passing two arguments num1 and num2.

Since the method is returning some value, we have stored the value in the result variable. Note : The method is not static.

Hence, we are calling the method using the object of the class. A Java method may or may not return a value to the function call. We use the return statement to return any value. For example,. Here, we are returning the variable sum. Since the return type of the function is int. The sum variable should be of int type. The calling of a method in a program is simple. When we call or invoke a user-defined method, the program control transfer to the called method.

In the above code snippet, as soon as the compiler reaches at line findEvenOdd num , the control transfer to the method and gives the output accordingly. In the following program, we have defined a method named add that sum up the two numbers. It has two parameters n1 and n2 of integer type.

The values of n1 and n2 correspond to the value of a and b, respectively. Therefore, the method adds the value of a and b and store it in the variable s and returns the sum. A method that has static keyword is known as static method. In other words, a method that belongs to a class rather than an instance of a class is known as a static method. We can also create a static method by using the keyword static before the method name. The main advantage of a static method is that we can call it without creating an object.

It can access static data members and also change the value of it. It is used to create an instance method. It is invoked by using the class name. The best example of a static method is the main method. The method of the class is known as an instance method. It is a non-static method defined in the class. Before calling or invoking the instance method, it is necessary to create an object of its class. Let's see an example of an instance method. Accessor Method: The method s that reads the instance variable s is known as the accessor method.

We can easily identify it because the method is prefixed with the word get. It is also known as getters. It returns the value of the private field. It is used to get the value of the private field. Mutator Method: The method s read the instance variable s and also modify the values. We can easily identify it because the method is prefixed with the word set.

It is also known as setters or modifiers. It does not return anything. It accepts a parameter of the same data type that depends on the field. It is used to set the value of the private field. The method that does not has method body is known as abstract method. In other words, without an implementation is known as abstract method. It always declares in the abstract class.

It means the class itself must be abstract if it has abstract method. To create an abstract method, we use the keyword abstract. It is a method that returns an object to the class to which it belongs.

All static methods are factory methods. JavaTpoint offers too many high quality services. Mail us on [email protected] , to get more information about given services. Please mail your requirement at [email protected] Duration: 1 week to 2 week.

In other languages, you have to think of a new name for each method, for example, drawString , drawInteger , drawFloat , and so on. In the Java programming language, you can use the same name for all the drawing methods but pass a different type of argument to each method.

Thus, the data drawing class might declare three methods named draw , each of which takes a different type of argument.