How to define methods in java

The so-called method is an orderly combination of codes used to solve a type of problem. It is a functional module.

Generally, the syntax for defining a method is:

Among them:

1. Access modifier: The method is allowed to be accessed The scope of permissions can be public, protected, private or even omitted, where public means that the method can be called by any other code.

2. Return value type: The type of the method return value. If the method does not return any value, the return value type is specified as void; if the method has a return value, the return value type needs to be specified, and in the method Use the return statement in the body to return the value.

3. Method name: The name of the defined method must use a legal identifier.

4. Parameter list: The parameter list passed to the method. There can be multiple parameters. Multiple parameters are separated by commas. Each parameter consists of parameter type and parameter name, separated by spaces.

Define a method with no parameters and no return value

For example: The following code defines a method named show with no parameters and no return value. The executed operation is to output "welcome to imooc."

Note:

1. The method body is placed in a pair of curly brackets to implement specific operations. .

2. The method name is mainly used when calling this method. Pay attention to the naming convention. Generally, the first letter of the first word is lowercase and the first letter of other words is capitalized.

Define a method with no parameters and a return value

For example: The following code defines a method named calSum with no parameters but a return value of type int. , the operation performed is to calculate the sum of two numbers and return the result

Define a method with parameters and no return value

For example:

Define a method with parameters and a return value

For example: The following code defines a show method with one parameter name, the method returns a String type result after execution

Recommended tutorial:java introductory tutorial

The above is the detailed content of How to define methods in java. For more information, please follow other related articles on the PHP Chinese website!