In this article,Getting input from Keyboard is explained in detail with examples.
"Scanner" is a class, using which, we can accept input from standard input device i.e.Keyboard.
"Scanner" is a class, using which, we can accept input from standard input device i.e.Keyboard.
This class is available in java.util package.Such package need to be imported in a java program.
Ex
import java.util.*; or
import java.util.Scanner;
To use this class,we create object of this class.
Ex
Scanner sc=new Scanner(System.in); //System.in defines standard input device i.e. Keyboard.
for getting the input from keyboard the statement should be in the format shown below
String ss=sc.next();
String ss=sc.nextline(); (From topic Getting input from Keyboard)
Datatype
|
Accepted value
|
next();
|
Accepts 1 word.
|
nextline();
|
Accepts 1 line of text.
|
nextBoolean();
|
Accepts Boolean value.
|
nextByte();
|
Accepts byte value.
|
nextShort();
|
Accepts short value.
|
nextInt();
|
Accepts int value.
|
nextLong();
|
Accepts long value.
|
nextFloat();
|
Accepts float value.
|
nextDouble();
|
Accepts double value.
|
Ex
//program related to Getting input from Keyboard--getting the input from keyboard.
import java.util.*;
class ScannerExample
{
public static void main(String args[])
{
Scanner scan=new Scanner(System.in);
String name;
System.out.print("Enter your name: ");
name=scan.next();
System.out.println("Given name is: "+name);// as we used next() we will get only1 word output.
}
}
Output
Ex
//program related to Getting input from Keyboard--getting the input from keyboard.
import java.util.*;
class ScannerExample
{
public static void main(String args[])
{
Scanner scan=new Scanner(System.in);
String name;
System.out.print("Enter your name: ");
name=scan.nextLine();
System.out.println("Given name is: "+name); // here the output is, total given words in single line.
}
}
Output
Ex
//program related to Getting input from Keyboard--getting the input from keyboard.
import java.util.*;
class ScannerExample
{
public static void main(String args[])
{
Scanner scan=new Scanner(System.in);
int x;
System.out.print("Enter your age: ");
x=scan.nextInt();
System.out.println("Your age is: "+x);
}
}
output
Ex
//program related to Getting input from Keyboard--getting the input from keyboard.
import java.util.*;
class ScannerExample
{
public static void main(String args[])
{
Scanner scan=new Scanner(System.in);
float f;
System.out.print("Enter your percentage: ");
f=scan.nextFloat();
System.out.println("Your percentage is: "+f);
}
}
Output
Ex
//program related to Getting input from Keyboard--getting the input from keyboard.
import java.util.Scanner;
class ScannerExample
{
public static void main(String args[])
{
Scanner scan=new Scanner(System.in);
boolean b;
System.out.print("Are you working (True/False): ");
b=scan.nextBoolean();
if(b)
System.out.println("Your are employeed");
else
System.out.println("Your are Unemployeed");
}
}
Output
Description of a class
From the command prompt,we can see description class using the following command.
Ex: javap -p java.util.Scanner
Here,
javap is a command intimating JVM to provide the description of a class.
-p also show private numbers of a class. (From topic Getting input from Keyboard)
Other Examples
To see the description of predefined classes/ system we use.
javap -p java.lang.String //pre-defined classes.
javap -p java.lang.System.
To see description of userdefined classes/files in folder we use.
file path(d:java)\> javap -p Student //user defined classes
file path(d:java)\> javap -p Rectangle.
Continue to next topic Arrays in Java.
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