Scnner Class - I

The Scanner class is a class in java.util. Scanner class allows user to get input from keyboard.  Scanner class also having many other methods that helps to read a text files and also breaks the input into tokens using a delimiter, is whitespace considered as default delimiter.

Some methods of Scanner class for reading data.

---

String next() -               Read the input only till the space

String nextLine() -         Reads till the end of line ( till ‘\n’)

Int nextInt() -                Read a Integer data from System.in

byte nextByte() -          Read tokens in byte data type.

boolean nextBoolean() - Returns boolean data type

double nextDouble() -    Read next token of the input as a double.

float nextFloat() -          Read next token of the input as a Float.

long nextLong() -           Read next token of the input as a :ong.

---

Example:

---

import java.util.*;

import java.io.*;

    class Scanner_Read

        {

            public static void main(String args[])throws IOException

                {

                    Scanner Sc=new Scanner(System.in);

                    System.out.print("\n\tEnter a Word : ");

                    String s=Sc.next();

                    String s1=Sc.nextLine(); // Clearing Buffer

                    System.out.print("\n\tEnter a Sentence : ");

                    s1=Sc.nextLine();

                    System.out.print("\n\tEnter a Byte : ");

                    byte b=Sc.nextByte();

                    System.out.print("\n\tEnter an Integer Data : ");

                    int n=Sc.nextInt();

                    s1=Sc.nextLine(); // Clearing Buffer

                    System.out.print("\n\tEnter an Double Data : ");

                    double d=Sc.nextDouble();

                    System.out.print("\n\tEnter an Float Data : ");

                    float f=Sc.nextFloat();

                    System.out.print("\n\tEnter an Long Data : ");

                    long L=Sc.nextLong();

                    System.out.println("\n\tInput Data : ");

                    System.out.println("\tWord : "+s+" Sentence : "+s1+" Byte "+b);

                    System.out.println("\tInteger : "+n+" Double : "+d+" Long "+L+" Float :"+f);

                }

        }

---

Output:

---

          Enter a Word : Hello

          Enter a Sentence : Hello! Fine.

          Enter a Byte : 12

          Enter an Integer Data : 234

          Enter an Double Data : 34.56

          Enter an Float Data : 33.4

          Enter an Long Data : 343434

          Data :

          Word : Hello Sentence :  Byte 12

          Integer : 234 Double : 34.56 Long 343434 Float :33.4

---

Other Scanner Class Methods for reading data

---

nextBigDecimal() -                       Read the next token of the input as a BigDecimal.

nextBigInteger() -                         Read the next token of the input as a BigInteger.

nextBigInteger(int radix) -             Read the next token of the input as a BigInteger.

nextByte(int radix) -                     Read the next token of the input as a byte.

nextInt(int radix) -                        Read the next token of the input as an int.

nextLong() -                                 Read the next token of the input as a long.

nextLong(int radix) -                     Read the next token of the input as a long.

nextShort() -                                Read the next token of the input as a short.

nextShort(int radix) -                    Read the next token of the input as a short.

---