Scanner is a new class that SDK1.5 adds, but uses this class to create an object.
Scanner reader=new Scanner (system.in);
The reader object then calls the following methods (functions) to read the various data types that the user entered at the command line:Next. Byte (), nextdouble (), Nextfloat,nextint (), Nextlin (), Nextlong (), Nextshot ()
The above method will cause blocking when running, waiting for the user to enter the data return confirmation at the command line. For example, the value of 12.34,hasnextfloat () in the keyboard input is true, while the value of Hasnextint () is false. Nextline () waits for the user to enter a line of text and enter, which gets a string type of data.
Here is an example:
Import java.util.*;
public class example{
public static void Main (String args[]) {
System.out.println ("Please enter a number of numbers, each input a number with a return confirmation");
SYSTEM.OUT.PRINTLN ("Last input a non-numeric end input operation");
Scanner reader=new Scanner (system.in);
Double sum=0;
int m=0;
while (Reader.hasnextdouble ()) {
Double x=reader.nextdouble ();
m=m+1;
Sum=sum+x;
}
System.out.printf ("%d number of%f/n", m,sum);
System.out.printf ("The average of%d numbers is%f/n", m,sum/m);
}
}
How to use scanner in Java
