18. Command Line Arguments In Java


✔ JAVA CHAPTERS:-

1. Introduction to Java
2. Features of Java
3. Java Virtual Machine
4. D/F B/W JVM, JRE, JDK
5. Java Data Types
6. Java Programs
7. Setting Java Path
8. OOPs Concepts
9. Object & Class In Java
10. OOPs Continued
11. Encapsulation & Polymorphism
12. Method Overloading
13. Method Overriding
14. Dynamic Method Dispatch
15. Association In Java
16. Inheritance in Java
17. Aggregation in java
18. Command Line Argument
19. Execute Command Line
20. Read Input From Command Line
21. Abstract Class In Java
22. Interface in Java
23. Cutom Marker Interface
24. Constructor In Java
25. Package in Java
26. Acess Modifier In Java
27. Static Import In Java
28. Package Class In Java
29. This Keyword
30. Instance Intializer Block
31. Super Keyword
32. Static Keyword
33. Final Keyword



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Command Line Arguments In Java

Command line arguments are the arguments passed at run time to java program. Arguments are used as input for the program. Any number of command line arguments can be passed to the program.
Command line arguments are be received by main method’s string type array, so they are string by default.

Example 1:

/**
 * This program is used for taking input by command line args.
 * @author java tutorial
 */
public class CommandLineArgument {
      public static void main(String args[]){
          int num1, num2;
          //check whether any value is entered or not.
          if (args.length > 0) {
           try {
            //parse string values to integer
              num1 = Integer.parseInt(args[0]);
              num2 = Integer.parseInt(args[1]);
 
              System.out.println("Sum of entered numbers = ");
              System.out.println(num1 + num2);
           } catch (NumberFormatException e) {
            //Catch exception if any in parsing.
              System.err.println("Argument must be an integer.");
           }
         }
      }
}

Output:

Sum of entered numbers = 50

Example 2:

/**
 * This program is used for taking any number of
 * input by command line args.
 * @author java tutorial
 */
 
public class CommandLineArgument {
      public static void main(String args[]){
            //print all entered values.
            for(int i = 0; i < args.length; i++){
                  System.out.println(args[i]);
            }
      }
}

Output:

20
30

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