What is method in java

In Java, What is a method?

A 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 Java 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.

Naming rules for Java methods

1. The first word of the method name should start with a lowercase letter, and subsequent words should start with a capital letter. No connectors are used. For example: addPerson.

2. Underscores may appear in JUnit test method names to separate logical components of the name. A typical pattern is: test_, such as testPop_emptyStack.

Definition of Java methods

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;}

Modifier: Modifier, this is optional and tells the compiler how to call the method. Defines the access type for this method.

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.

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

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.

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

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