Command line-arguments-in-java-tutorial

Jan 1, 20182 likes2,618 views

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Objectives
At the end of the lesson, the student
should be able to:
Know and explain what a command-line
argument is
Get input from the user using command-line
arguments
How to pass command-line arguments in
Command prompt

Command-line Arguments
• Command line arguments means a way to
pass parameters to the main function while
executing the program.
• A Java application can accept any number of
arguments from the command-line.
• Command-line arguments allow the user to
affect the operation of an application.
• The user enters command-line arguments
when invoking the application and specifies
them after the name of the class to run.

Command-line Arguments
• For example, suppose you have a Java
application, called Sort, that sorts five
numbers, you run it like this:
● Note: The arguments are separated by spaces.

Command line arguments in DOS
• The following screen image shows Command
line arguments in DOS:

How Java Application Receive
Command-line Arguments
• In Java, when you invoke an application, the
runtime system passes the command-line
arguments to the application‘s main method
via an array of Strings.
public static void main( String[] args )
• Each String in the array contains one of the
command-line arguments.

args[ ] array
• Given the previous example where we run:
java Sort 5 4 3 2 1
• the arguments are stored in the args array of
the main method declaration as…

Example
To print the array of arguments, we write:
1 public class CommandLineSample
2 {
3 public static void main( String[] args ){
4
5 for(int i=0; i<args.length; i++){
6 System.out.println( args[i] );
7 }
8
9 }
10 }

Conversion of Command-line Arguments
• If your program needs to support a numeric
command-line argument, it must convert a String
argument that represents a number, such as "34",
to a number.
• Here's a code snippet that converts a command-
line argument to an integer,
int firstArg = 0;
if (args.length > 0){
firstArg = Integer.parseInt(args[0]);
}
the parseInt() method in the Integer class throws
a NumberFormatException (ERROR) if the format
of args[0] isn't valid (not a number).

Parsing Numeric Command-Line Arguments with
exception handling
• If an application needs to support a numeric command-line argument, it
must convert a String argument that represents a number, such as "34",
to a numeric value. Here is a code snippet that converts a command-line
argument to an int:
parseInt throws a NumberFormatException if the format of args[0]
isn't valid. All of the Number classes — Integer, Float, Double, and so
on — have parseXXX methods that convert a String representing a
number to an object of their type.

Command-line Arguments:
Coding Guidelines
• 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 5 arguments,

Examples
• The code snippet shows the switch method
working through command line arguments…

Summary
Command-line arguments
– How to access the arguments
– How to convert String arguments to integer
using Integer.parseInt method
– How to pass command-line arguments in
Command prompt

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