Java Scanner - hasNext() Method

The java.util.Scanner.hasNext() method returns true if the scanner has another token in its input. This method may block while waiting for input to scan. The scanner does not advance past any input.

Syntax

public boolean hasNext()

Parameters

No parameter is required.

Return Value

Returns true if this scanner has another token in its input.

Exception

Throws IllegalStateException, if this scanner is closed.

Example:

In the example below, the java.util.Scanner.hasNext() method is used to check whether the scanner has another token in its input or not.

import java.util.*;

public class MyClass {
  public static void main(String[] args) {

    //String to scan
    String MyString = "Hello World 10 + 20 = 30.0";

    //creating a Scanner
    Scanner MyScan = new Scanner(MyString);

    while(MyScan.hasNext()) {
      //print the next token while there is a next token
      System.out.println(MyScan.next());
    }

    //close the scanner
    MyScan.close();
  }
}

The output of the above code will be:

Hello
World
10
+
20
=
30.0