lecture 4:java Method

Java Methods:
A Java method is a collection of statements that are grouped together to perform an operation. When you call the System.out.println method, for example, the system actually executes several statements in order to display a message on the console.
Now you will learn how to create your own methods with or without return values, invoke a method with or without parameters, overload methods using the same names, and apply method abstraction in the program design.
Creating a Method:
In general, a method has the following syntax:
modifier returnValueType methodName(list of parameters){
// Method body;
}
A method definition consists of a method header and a method body. Here are all the parts of a method:
? Modifiers: The modifier, which is optional, tells the compiler how to call the method. This defines the access type of the method.
? Return Type: A method may return a value. The returnValueType is the data type of the value the method returns. Some methods perform the desired operations without returning a value. In this case, the returnValueType is the keyword void.
? Method Name: This is the actual name of the method. The method name and the parameter list together constitute the method signature.
? Parameters: A parameter is like a placeholder. When a method is invoked, you pass a value to the parameter. This value is referred to as actual parameter or argument. The parameter list refers to the type, order, and number of the parameters of a method. Parameters are optional; that is, a method may contain no parameters.
? Method Body: The method body contains a collection of statements that define what the method does.