java - Error with user input within calculator program -

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this code used calculator program.

package javaapp; import java.util.scanner; public class javaapp { public static void main(string args[]){     scanner matt = new scanner("system.in");     double fnum;      double snum;      double answer;     system.out.println("enter first number: ");     fnum = matt.nextdouble();    system.out.println("enter second number: ");     snum = matt.nextdouble();     answer = fnum + snum;     system.out.println(answer);     } }

this error:

exception in thread "main" java.util.inputmismatchexception @ java.util.scanner.throwfor(scanner.java:909) @ java.util.scanner.next(scanner.java:1530) @ java.util.scanner.nextdouble(scanner.java:2456) @ javaapp.javaapp.main(javaapp.java:10) java result: 1

remove quotes constructor of scanner it's not attempting read string source

scanner matt = new scanner(system.in);

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