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This article focuses on "how to use Scanner in Java". Interested friends may wish to have a look at it. The method introduced in this paper is simple, fast and practical. Let the editor take you to learn how to use Scanner in Java.

Scanner

Basic grammar

Scanner s = new Scanner (System.in)

The input string is obtained by the next () and nextLine () methods of the Scanner class, and hasNext () and hasNextLine () are generally used to determine whether there is any input data before reading.

Use the next method:

Scanner scan = new Scanner (System.in)

/ / receive data from the keyboard

/ / receive string in next mode

System.out.println ("receive by next:")

/ / determine whether there is any input

If (scan.hasNext ()) {

String str1 = scan.next ()

System.out.println ("input data is:" + str1)

}

Scan.close ()

Next () method:

You must read valid characters before you can end the input.

The next () method automatically removes whitespace encountered before entering valid characters.

Use the white space entered after a valid character as a delimiter or Terminator only after entering a valid character.

Next () cannot get a string with spaces.

Use the nextLine method:

Scanner scan = new Scanner (System.in)

/ / receive data from the keyboard

/ / receive string in nextLine mode

System.out.println ("receive by nextLine:")

/ / to determine whether the http://m.zykdbh.com/ of Zhengzhou Hospital for treatment of birthmarks is still being imported.

If (scan.hasNextLine ()) {

String str2 = scan.nextLine ()

System.out.println ("input data is:" + str2)

}

Scan.close ()

NextLine () method:

With Enter as the Terminator, that is, the nextLine () method returns all the characters before entering carriage return.

You can get blanks.

If you want to enter data of type int or float, it is also supported in the Scanner class, but it is best to use the hasNextXxx () method to validate before entering, and then use nextXxx () to read it.

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