How To - Java Methods
Let's begin with the basics.
In the first post we took a look at the small Program HelloWorld which printed the message Hello World out into our command line.
This was a very simple program and with a basic command, but when we write scripts or programs that calculate values, or help sorting stuff we will need methods.
We will write a program that calculates the middle value of two fixed values we give the method.
Try to read the code and understand what part stands for what:
- class name, main method, what is being called in the main method
So here again in line 1 we have a public class with the class name MiddleVal for Middle Value, then open brackets to open the class body,
line 2 contains the main method (which makes this class autonomous in itself) which also calls out method in the 3. line with 2 parameters that we give to the method.
Now we can take a closer look into line 6 - what does the method in line 3 actually do?
It's called public static int middleValue and to use this method we need to give it 2 Integer parameters: int a and int b.
Also note the int which is placed right before the method name - this is our return value, what for a type of value you will get back from the method once it has finished its work.
In the method body we introduce a new Integer value called int middle, which gets it's value assigned by the term (a + b)/2 and as always we close commands with a semicolon
If you want to calculate the middle value for numerous fixed parameters, you need to add these to the parameter list in the round brackets of your method.
In the first post we took a look at the small Program HelloWorld which printed the message Hello World out into our command line.
This was a very simple program and with a basic command, but when we write scripts or programs that calculate values, or help sorting stuff we will need methods.
We will write a program that calculates the middle value of two fixed values we give the method.
Try to read the code and understand what part stands for what:
- class name, main method, what is being called in the main method
So here again in line 1 we have a public class with the class name MiddleVal for Middle Value, then open brackets to open the class body,
line 2 contains the main method (which makes this class autonomous in itself) which also calls out method in the 3. line with 2 parameters that we give to the method.
Now we can take a closer look into line 6 - what does the method in line 3 actually do?
It's called public static int middleValue and to use this method we need to give it 2 Integer parameters: int a and int b.
Also note the int which is placed right before the method name - this is our return value, what for a type of value you will get back from the method once it has finished its work.
In the method body we introduce a new Integer value called int middle, which gets it's value assigned by the term (a + b)/2 and as always we close commands with a semicolon
If you want to calculate the middle value for numerous fixed parameters, you need to add these to the parameter list in the round brackets of your method.
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