java what is method

java What is a method

Java method is a collection of statements that together perform a function . A method is an ordered combination of steps to solve a type of problem. Methods are contained in classes or objects. Methods are created in the program and referenced elsewhere.

Advantages of the method

1. Make the program shorter and clearer.

2. Conducive to program maintenance.

3. It can improve the efficiency of program development.

4. Improved code reusability.

Name rules for methods

1. Must start with a letter, '_' or '$'.

2. Can include numbers, but cannot start with them.

Definition of method

Generally, defining a method includes the following syntax:

修饰符 返回值类型 方法名(参数类型 参数名){ ... 方法体 ... return 返回值; }

The method includes a method header and a method body. Here are all the parts of a method:

a) Modifiers: Modifiers, which are optional, tell the compiler how to call the method. Defines the access type for this method.

b) Return value type: Methods may return values. returnValueType is the data type of the method return value. Some methods perform the required operation but do not return a value. In this case, returnValueType is the keyword void.

c) Method name: is the actual name of the method. The method name and parameter list together form the method signature.

d) Parameter type: The parameter is like a placeholder. When the method is called, values ​​are passed to the parameters. This value is called an actual parameter or variable. The parameter list refers to the parameter type, order and number of parameters of the method. Parameters are optional and methods can contain no parameters.

e) Method body: The method body contains specific statements that define the function of the method.

For example:

public static int age(int birthday){...}

There can be multiple parameters:

static float interest(float principal, int year){...}

Note: In some other languages, methods refer to procedures and functions. A method that returns a non-void return value is called a function; a method that returns a void return value is called a procedure.

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