• Methods are blocks of code or sets of instructions designed to perform a specific task.
• They are executed only when called (invoked).

Advantages of Methods

• Code Modularity: Divides a large program into smaller sub-tasks by creating separate methods for each functionality, making the code easier to manage.
• Code Reusability: Once defined, a method can be invoked multiple times from different parts of the program.
• Easy Code Modification: New functionality can be added, or existing code can be modified, without impacting unrelated parts of the program.
• Improved Readability: Well-structured methods make the code cleaner and easier to understand (note: “documented” is not inherently tied to readability unless you mean well-commented code).

syntax:

Classification of Methods

1. Based on there Creation

   

   1. Predefine Method: A methods which is known by the java is known as predefine/use define method
   2. User Define Method: A methods which is defined by user is known as predefine/use define method

2. Based on Format Arguments

   

   1. No-Argument Methods: Methods that do not accept any parameters (e.g., void sayHello()).
   2. Parameterized Methods: Methods that accept one or more parameters (formal arguments, e.g., void add(int a, int b)).

3. Based on there Modifier

   

   1. Static Methods: Declared with the static keyword; belong to the class, not instances (e.g., static void main()).
   2. Non static Method: Not declared with static; belong to instances of the class. These are further classified into:
      1. Concrete Method: The method which are non-static and have method body(implementation).
      2. Abstract Method: The non static Method which does not have method body (implementation).

   Terminologies:

   

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Modifier:

• Modifiers are the keywords in java which are used to alter the behavior of java members.
• Members such as -
• static (variable , methods, block, innerclass)
• Non static (variable, methods, block, innerclass, constructor)
• classes and interfaces