20. Read Input From Command Line 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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How To Read Input From Command Line In Java Using Scanner

Scanner class is used to read input from command line. Scanner class is in java.util package. Scanner class has methods like nextInt(), nextFloat(), nextDouble() etc which read numeric data without any need of parsing using Integer.parseInt()  etc. These methods will throw an exception if you pass string or char type value.

Example:

/**
 * This program is used to read input using Scanner Class.
 * @author java tutorial
 */
public class ReadInputUsingScanner {
       public static void main(String args[]){
       //create a scanner class object.
       Scanner scanner = new Scanner(new 
           InputStreamReader(System.in));
       System.out.println("Enter your full name: ");  
 
      //read a line using scanner object.
      String userName = scanner.nextLine();
      System.out.println("Enter your full age: ");  
 
      //read an integer using scanner object.
      int age = scanner.nextInt(); 
 
       //print input values
       System.out.println("User name : " + userName);
       System.out.println("User age : " + age);
    }
}

Output:

Enter your full name:
jai
Enter your full age:
27
User name : jai
User age : 27

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