{"id":79152,"date":"2020-06-22T09:00:56","date_gmt":"2020-06-22T03:30:56","guid":{"rendered":"https:\/\/techvidvan.com\/tutorials\/?p=79152"},"modified":"2020-06-22T09:00:56","modified_gmt":"2020-06-22T03:30:56","slug":"java-scanner-class","status":"publish","type":"post","link":"https:\/\/techvidvan.com\/tutorials\/java-scanner-class\/","title":{"rendered":"Java Scanner Class – Methods and Constructors"},"content":{"rendered":"

In our previous article, we discussed the implements keyword in Java. In this article, we will discuss a special class in Java which is the Java Scanner Class<\/strong>.<\/p>\n

Till now, we learned how to print something on the user\u2019s screen with a Java program. But, if you wish to take input from the user while writing a program, then you can use the Scanner class of Java.<\/p>\n

In this article, we will learn about this class along with its methods and will understand them with example code snippets and programs.<\/p>\n

Scanner Class in Java<\/h3>\n

The Scanner class in Java is a predefined class that helps us to take input from the user. This class is present in the java.util package and we need to import this package inside our Java program to use this class.<\/p>\n

There are many predefined methods in the java.util.Scanner class for performing various operations like reading and parsing various primitive types. Basically, we have to create the object of the Scanner class to use these methods.<\/p>\n

The Scanner class can also parse strings and primitive types by using regular expressions.<\/p>\n

The Scanner class in Java extends the Object class and implements the Cloneable and Iterator interfaces.<\/p>\n

Importing Java Scanner Class<\/h3>\n

To use the methods and functionalities of the Scanner class, we need to include the class in our Java program by importing the java.util package using the import keyword at the beginning of the code.<\/p>\n

We can do it in two ways:<\/p>\n

1. import java.util.Scanner;<\/strong>
\n\/\/imports the Scanner class<\/strong><\/p>\n

2. import java.util.*;<\/strong>
\n\/\/imports all the classes of java.util package<\/strong><\/p>\n

Using Scanner Class in Java<\/h3>\n

After importing the Scanner class, we have to get the instance of the Scanner class to read the input from the user. We will create an instance and we will pass the Input Stream System.in while creating the instance as follows:<\/p>\n

Scanner scannerObject = new Scanner(System.in);<\/strong><\/p>\n

Here, by writing the Scanner scannerObject, we are declaring the scannerObject as the object of the scanner class. System.in denotes that the input will be given to the System.<\/p>\n

Constructors of Java Scanner Class<\/h3>\n

The Scanner class contains the constructors for specific purposes that we can use in our Java program.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
S.N.<\/b><\/td>\nConstructor<\/b><\/td>\nDescription<\/b><\/td>\n<\/tr>\n
1)<\/span><\/td>\nScanner(File source)<\/span><\/td>\nThis constructor creates a Scanner object that produces values scanned from the specified file.<\/span><\/td>\n<\/tr>\n
2)<\/span><\/td>\nScanner(File source, String charsetName)<\/span><\/td>\nThis constructor constructs a new Scanner object that produces values scanned from the specified file.<\/span><\/td>\n<\/tr>\n
3)<\/span><\/td>\nScanner(InputStream source)<\/span><\/td>\nThis constructor creates a new Scanner object that produces values scanned from the specified input stream.<\/span><\/td>\n<\/tr>\n
4)<\/span><\/td>\nScanner(InputStream source, String charsetName)<\/span><\/td>\nThis constructor creates a new Scanner that produces values scanned from the specified input stream.<\/span><\/td>\n<\/tr>\n
5)<\/span><\/td>\nScanner(Readable source)<\/span><\/td>\nThis constructor creates a new Scanner that produces values scanned from the specified source.<\/span><\/td>\n<\/tr>\n
6)<\/span><\/td>\nScanner(String source)<\/span><\/td>\nThis constructor creates a new Scanner that produces values scanned from the specified string.<\/span><\/td>\n<\/tr>\n
7)<\/span><\/td>\nScanner(ReadableByteChannel source)<\/span><\/td>\nThis constructor creates a new Scanner that produces valgues scanned from the specified channel.<\/span><\/td>\n<\/tr>\n
8)<\/span><\/td>\nScanner(ReadableByteChannel source, String charsetName)<\/span><\/td>\nThis constructor creates a new Scanner that produces values scanned from the specified channel.<\/span><\/td>\n<\/tr>\n
9)<\/span><\/td>\nScanner(Path source)<\/span><\/td>\nThis constructor creates a new Scanner that produces values scanned from the specified file.<\/span><\/td>\n<\/tr>\n
10)<\/span><\/td>\nScanner(Path source, String charsetName)<\/span><\/td>\nThis constructor creates a new Scanner that produces values scanned from the specified file.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Methods of Java Scanner Class<\/h3>\n

Now, we will discuss some important methods of the Scanner class without which taking the input is impossible.<\/p>\n

Following is the list of methods that we use for various data types.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n
Method<\/b><\/td>\nDescription<\/b><\/td>\n<\/tr>\n
boolean nextBoolean()<\/span><\/td>\nThis method reads the boolean value from the user.<\/span><\/td>\n<\/tr>\n
byte nextByte()<\/span><\/td>\nIt reads the byte value from the user.<\/span><\/td>\n<\/tr>\n
double nextDouble()<\/span><\/td>\nIt accepts the input in double datatype from the user.<\/span><\/td>\n<\/tr>\n
float nextFloat()<\/span><\/td>\nIt takes the float value from the user.<\/span><\/td>\n<\/tr>\n
int nextInt()<\/span><\/td>\nIt scans the input in the int type from the user.<\/span><\/td>\n<\/tr>\n
String nextLine()<\/span><\/td>\nThis method reads the String value from the user.<\/span><\/td>\n<\/tr>\n
long nextLong()<\/span><\/td>\nThis method reads the long type of value from the user.<\/span><\/td>\n<\/tr>\n
short nextShort()<\/span><\/td>\nIt reads the short type of value from the user.<\/span><\/td>\n<\/tr>\n
char next()<\/span><\/td>\nIt reads the character input from the user.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Code to understand the above methods<\/h4>\n

Let\u2019s see a single java program that uses all the above-mentioned methods of the Scanner class:<\/p>\n

Code to read data of various types using Scanner class:<\/strong><\/p>\n

package com.techvidvan.scannerclass;\nimport java.util.Scanner;\npublic class ScannerMethodDemo {\n  public static void main(String[] args) {\n    Scanner sc = new Scanner(System. in );\n    System.out.println(\"Taking inputs from user\");\n    System.out.println(\"Enter name of the Employee:\");\n    \/\/ String input \n    String name = sc.nextLine();\n    System.out.println(\"Enter post:\");\n    String post = sc.nextLine();\n    System.out.println(\"Enter gender:\");\n    \/\/ Character input \n    char gender = sc.next().charAt(0);\n\n    \/\/ Numerical data input \n    System.out.println(\"Enter age:\");\n    int age = sc.nextInt();\n    System.out.println(\"Enter mobile number:\");\n    long mobileNo = sc.nextLong();\n    System.out.println(\"Enter salary\");\n    double salary = sc.nextDouble();\n\n    \/\/ Print the values to check if the input was correctly obtained. \n    System.out.println(\"\\nName: \" + name);\n    System.out.println(\"Post: \" + post);\n    System.out.println(\"Gender: \" + gender);\n    System.out.println(\"Age: \" + age);\n    System.out.println(\"Mobile Number: \" + mobileNo);\n    System.out.println(\"Salary: \" + salary);\n  }\n}<\/pre>\n
Output<\/strong><\/p>\n
Taking inputs from the user
\nEnter the name of the Employee:
\nAvina Garg
\nEnter post:
\nResearch Analyst
\nEnter gender:
\nF
\nEnter age:
\n23
\nEnter mobile number:
\n95687968756
\nEnter salary
\n30000.00
\nName: Avina Garg
\nPost: Research Analyst
\nGender: F
\nAge: 23
\nMobile Number: 95687968756
\nSalary: 30000.00<\/div>\n
Java hasNextDataType() Methods<\/h3>\n
There are times when we need to check if the next value we read is of a certain type or if the input has EOF or not. Then, we check if the scanner\u2019s input is of the type we want with the help of hasNextXYZ() functions where XYZ is the datatype we want to use.<\/p>\n
The method returns true if the scanner has a token of that type, otherwise returns false. There are some boolean methods for each data type.to check whether the next token of a particular data type is available in the given input or not. The following table shows them:<\/p>\n\n\n\n\n\n\n\n\n\n\n\n
Method\u00a0<\/b><\/td>\nDescription<\/b><\/td>\n<\/tr>\n
boolean hasNextBoolean()<\/span><\/td>\nThis method checks if the next token in this scanner’s input\u00a0 interprets as a Boolean using the nextBoolean() method or not.<\/span><\/td>\n<\/tr>\n
boolean hasNextByte()<\/span><\/td>\nThis method checks if the next token in this scanner’s input interprets as a Byte using the nextByte() method or not.<\/span><\/td>\n<\/tr>\n
boolean hasNextDouble()<\/span><\/td>\nThis method checks whether the next token in this scanner is a BigDecimal input using the nextBigDecimal() method or not.<\/span><\/td>\n<\/tr>\n
boolean hasNextFloat()<\/span><\/td>\nThis method checks whether the next token in this scanner’s input interprets as a Float using the nextFloat() method or not.<\/span><\/td>\n<\/tr>\n
boolean hasNextInt()<\/span><\/td>\nThis method checks whether the next token in this scanner’s input interprets as an int using the nextInt() method or not.<\/span><\/td>\n<\/tr>\n
boolean hasNextLine()<\/span><\/td>\nThis method checks whether there is another line in the input of this scanner or not.<\/span><\/td>\n<\/tr>\n
boolean hasNextLong()<\/span><\/td>\nThis method checks whether the next token in this scanner’s input interprets as a Long using the nextLong() method or not.<\/span><\/td>\n<\/tr>\n
boolean hasNextShort()<\/span><\/td>\nThis method checks whether the next token in this scanner’s input interprets as a Short using the nextShort() method or not.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
Code to read some values using Scanner class and print their mean:<\/strong><\/p>\n
package com.techvidvan.scannerclass;\nimport java.util.Scanner;\npublic class ScannerMethodsDemo1 {\n  public static void main(String[] args) {\n    System.out.println(\"Enter the numbers and any character other than an integer to get their mean:\");\n    Scanner sc = new Scanner(System. in );\n\n    \/\/ Initialize sum and count of input elements \n    int sum = 0,\n    count = 0;\n\n    \/\/Checking if an int value is available \n    while (sc.hasNextInt()) {\n      \/\/ Read an int value \n      int num = sc.nextInt();\n      sum += num;\n      count++;\n    }\n    int mean = sum \/ count;\n    System.out.println(\"Mean of the numbers is: \" + mean);\n  }\n}<\/pre>\n
Output<\/strong><\/p>\n
Enter numbers and any character other than an integer to get the Mean of numbers:
\n2
\n4
\n6
\n4
\n10
\n24
\n57
\n80
\nA
\nMean of the numbers is: 26<\/div>\n
Working of Java Scanner class<\/h3>\n
The Scanner class reads an entire line and divides the line into tokens. Tokens are small elements that have some meaning to the Java compiler.<\/p>\n
Suppose there is an input string:<\/p>\n
His age is 23<\/p>\n
In this case, the scanner object will read the entire line and divide the string into tokens: “His”, “age” “is” and “23”. The object then iterates over each token and reads each token using its different methods.<\/p>\n
Note:<\/strong><\/em> By default, the use of whitespace is to divide tokens.<\/p>\n
String Tokenization using the Scanner class<\/h3>\n
Java Scanner class is also used to parse the string into tokens and perform operations on them. There are some useful methods provided by the Scanner class to do this. These methods are:<\/p>\n\n\n\n\n\n\n\n
Method<\/b><\/td>\nDescription<\/b><\/td>\n<\/tr>\n
Stream<String> tokens()<\/span><\/td>\nThis method gives a stream of delimiter-separated tokens from the Scanner object which is in use.<\/span><\/td>\n<\/tr>\n
String toString()<\/span><\/td>\nThis method returns the string representation of Scanner using.<\/span><\/td>\n<\/tr>\n
Scanner useDelimiter()<\/span><\/td>\nThis method sets the delimiting pattern of the Scanner which is in use to the specified pattern.<\/span><\/td>\n<\/tr>\n
void close()<\/span><\/td>\nThis method closes this scanner.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
Code to understand the String Tokenization with the Scanner class:<\/strong><\/p>\n
Example 1:<\/strong><\/p>\n
package com.techvidvan.scannerclass;\nimport java.util.Scanner;\npublic class ScannerTokens1 {\n  public static void main(String args[]) {\n    String s = \"Techvidvan%Java%Tutorials%Scanner%program%3\";\n    \/\/Initialize Scanner object \n    Scanner sc = new Scanner(s);\n    \/\/Initialize the string delimiter  \n    sc.useDelimiter(\"%\");\n    \/\/Prints stream of delimiter-separated tokens  \n    sc.tokens();\n    \/\/Printing the tokenized Strings  \n    while (sc.hasNext()) {\n      System.out.println(sc.next());\n    }\n    sc.close();\n  }\n}<\/pre>\n
Output<\/strong><\/p>\n
Techvidvan
\nJava
\nTutorials
\nScanner
\nprogram
\n3<\/div>\n
Example 2:<\/strong><\/p>\n
package com.techvidvan.scannerclass;\nimport java.util.Scanner;\npublic class ScannerTokens2 {\n  public static void main(String args[]) {\n    String input = \"5 Java 2 Java techvidvan Java tutorial Java\";@SuppressWarnings(\"resource\")\n    Scanner sc = new Scanner(input).useDelimiter(\"\\\\s*Java\\\\s*\");\n    \/\/ \\\\s* means 0 or more repetitions of any whitespace character   \n    \/\/Java is the pattern to find \n    sc.tokens();\n    System.out.println(sc.nextInt()); \/\/ prints: 5  \n    System.out.println(sc.nextInt()); \/\/ prints: 2  \n    System.out.println(sc.next()); \/\/ prints: techvidvan  \n    System.out.println(sc.next()); \/\/ prints: tutorial         \n    \/\/close the scanner  \n    sc.close();\n  }\n}<\/pre>\n
Output<\/strong><\/p>\n
5
\n2
\ntechvidvan
\ntutorial<\/div>\n
Example 3:<\/strong><\/p>\n
import java.util. * ;\npublic class ScannerTokens3 {\n  public static void main(String args[]) {\n    String myStr = \"Hello\/This is TechVidvan\/Java Tutorials\/Scanner class\";\n    \/\/Create a scanner class object with the specified String  \n    Scanner scanner = new Scanner(myStr);\n    \/\/Changing the delimiter of this scanner  \n    scanner.useDelimiter(\"\/\");\n    \/\/Printing the tokenized Strings  \n    System.out.println(\"---The Tokenized Strings are---\");\n    while (scanner.hasNext()) {\n      System.out.println(scanner.next());\n    }\n    \/\/Displaying the new delimiter  \n    System.out.println(\"Delimiter used: \" + scanner.delimiter());\n    scanner.close();\n  }\n}<\/pre>\n
Output<\/strong><\/p>\n
—The Tokenized Strings are—
\nHello
\nThis is TechVidvan
\nJava Tutorials
\nScanner class
\nDelimiter used: \/<\/div>\n
Conclusion<\/h3>\n
This was all about Java Scanner class. The Scanner class plays a very important role in taking inputs from the user. It is present in the java.util package and comes with various constructors and methods to take inputs of all types of primitive data types and String types.<\/p>\n
It is also helpful in tokenizing the strings. We have discussed the concepts with examples for your better understanding. We hope this article will be helpful in studying the Scanner class in Java.<\/p>\n","protected":false},"excerpt":{"rendered":"
In our previous article, we discussed the implements keyword in Java. In this article, we will discuss a special class in Java which is the Java Scanner Class. 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