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Grade 10/Computer Science/ICS4U1/Methods.md
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Grade 10/Computer Science/ICS4U1/Methods.md
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# Methods
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## What are methods
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A java method can be interpreted as a subprogram. It is a collection of statements taht are grouped togehter to perform an operation
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## Built- in vs User-defined Methods
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Built-in:
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BUild-i nmethods arep art of hte complier package such as system.out.println
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Function (return) - Type: it calcualtes and return a value
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```java
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public static int claculate(int number){
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```
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procedure-type: executes some commands
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Function (return)- type:
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pubic static return type method name (parameter 1)
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procedure-type method:
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public static void method-name (paramenter 1)
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## How to create a method
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In general, method declarations has 5 basic components (figure 2.):
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- **Modifier:** defines access type of the method i.e. from were it can be accessed in your application (For example: public)
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- **The return type:** the data type of the value returned by the method or void if it does not return a value (procedure and function type)
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- **Method name:** a specific names that identifies the method that can be used to invoke it later
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- **Parameter list:** Comma separated list of the input parameter are defined preceded with their data type, within the enclosed parentheses, If there are no parameters, you must use empty parenteses()
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## Method declaration
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- **Method body:** It is enclosed between braces. the code that you need to be execute to perfrom your intended operations
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```java
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public int max(int x, int y) {
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```
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## How to call a method (method invocation
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To invoke a method you need the method name with the parameter list defined between parentheses
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Exammple:
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Method Name (paramter list)
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Must have () parentheses when calling a method, even with no passing parameters
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## Pass-By-Value
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**What happens:** When a method is called ,a copy of the value of each argument is passed to the method
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**In the second method:** This copy can be changed inside the method, however such a change has no effect on the actual argumnet
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```
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int num=10;
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double decimal = 5.2;
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NumberManeuvers(num decimal);
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System.out.println("num = " + num + "and decimal = " + decimal);
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public static void numberManeuvers(int i, double j) {
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if(i == 10) {
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j = 6.2;
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i = 12;
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}
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}
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// output = num = 10 and decimal = 5.2
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```
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## Pass-By-Reference
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