Java methods (detailed introduction)

So what is the method?

A Java method is a collection of statements that together perform a function.                                                                                                                                                                                                                                                                                                     Contained in a class or object

Methods are created in the program and referenced elsewhere

Advantages of methods

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 methods

1. The first word of the method name should start with a lowercase letter, and subsequent words should start with a capital letter. Use connectors. 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 method

Generally, defining a method contains 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 contains a method header and a method body. Here are all the parts of a method:

Modifiers: Modifiers, which are optional, tell 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.

Example

The following method contains 2 parameters num1 and num2, and it returns the maximum value of these two parameters.

/** 返回两个整型变量数据的较大值 */
public static int max(int num1, int num2) {
   int result;
   if (num1 > num2)
      result = num1;
   else
      result = num2;
 
   return result; 
}

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