- Before using command-line arguments, always check the number of arguments before accessing the array elements so that there will be no exception generated.
- For example, if your program needs the user to input 6 arguments,
Method 1:
or,
Method 2: Read more…
New Java Project
- Create a new Java Project and name it as “CommandLineArguments“
Right click on Package Explorer -New -Project -Select Java Project
New package
- Create a new Package and name it as “commandline
- Command line arguments are stored as String in the args array. If your application needs a numeric value then it must be converted to the required type.
- Here’s the code that converts a command-line argument to an integer,
Test Case Read more…
- In Java, when you launch an application, you can pass command-line arguments to the application’s main method through an array of Strings.
- Each element in the array is one command-line argument.
Steps to pass command line arguments to the application.
- Java allows you to pass arguments to an application when the application is launched.
- The application can accept any number of arguments from the command-line.
- This allows the user to specify configuration information.
- The user enters command-line arguments when invoking
Array Creation
There are three ways of creating an array.
Array Length
Length/size of the array can be obtained using
arrayReferenceName.length
Illegal Array Declaration
You should not specify the size when you declare the array
Array instance/static field
Instance or Read more…
In Java, Arrays are Objects. Hence, they behave exactly as objects do. If the array is modified in the method then the caller will also see the updated value.
Here is an example,
In main: Before Passing array to methodTest Read more…
An array can be used almost everywhere.
- Instance or static field
- Local or parameter variable
- Method parameter
- Method argument
- Method return type
- Return expression,
- etc
Using Enhanced For-loop
This is a specialized for loop introduced in Java SE 6 to loop through an array or collection.
It has two parts for(declaration : expression)
| declaration | newly declared variable of type compatible with the array element. |
|---|---|
| expression |
In this tutorial on Java Arrays, we will see to how to assign an array – both Primitive Array assignment and Reference Array assignment.
Java Primitive Array Assignment
If an array is declared as int (int[]) then you can assign Read more…