Console.readInt

Question

Right, since you�re the Java Experts.
And I'm very stupid!!!
I downloaded the JDK Kit from Sun
Installed
No Problem,followed the instructions, etc,etc.
When I compile a simple Program such as this one here.
There�s no problem.
(read on after Program)
class Pay01
This class implements a simple program that
will compute the amount of interest that is
earned on $17,000 invested at an interest
rate of 0.07 for one year. The interest and
the value of the investment after one year are
printed to standard output.
public static void main(String[] args) {
/* Declare the variables. */
double principal; // The value of the investment.
double rate; // The annual interest rate.
double interest; // Interest earned in one year.
/* Do the computations. */
principal = 17000;
rate = 0.07;
interest = principal * rate; // Compute the interest.
principal = principal + interest;
// Compute value of investment after one year, with interest.
// (Note: The new value replaces the old value of principal.)
/* Output the results. */
System.out.print("The interest earned is $");
System.out.println(interest);
System.out.print("The value of the investment after one year is $");
System.out.println(principal);
} // end of main()
} // end of class pay01
When I try to run a program or compile a program using console.readInt (ie taking data from the keyboard) I get a compile error.
Heres a SAMPLE PROGRAM which I know is correct that uses console.readInt but does not run. What am I doing wrong?
I thought that the computer did not recognize Console.readInt(ie conflict) so I tried TextIo.get which does the same thing. Still the same problem.
What am I doing wrong???
Did I install JDK wrongly (I dont think so as i followed all the Instructions clearly)??
If so can you give me an idiots version for installing it.
Here are the programs.
What am I doing wrong?????
class ComputeNumbers
* Program to illustrate reading input from the keyboard
* using the method readInt () in the class Console
* The program inputs two numbers from the user and outputs
* the sum , the product, the quotient and the remainder
public static void main (String[] args)
// declare variables
int firstNumber;
int secNumber , sum, prod, quot, rem;
// input 2 numbers from the use
System.out.println(" Enter the first number (integer) ");
firstNumber = Console.readInt(); // assign to (put into) the variable
// firstNumber the value that is typed at the
// keyboard
System.out.println(" Enter the second number (integer) ");
secNumber = Console.readInt();
// compute
sum = firstNumber + secNumber;
prod = firstNumber * secNumber;
quot = firstNumber / secNumber;
rem = firstNumber % secNumber;
// print results
class Pay02 {
This class implements a simple program that
will compute the amount of interest that is
earned on an investment over a period of
one year. The initial amount of the investment
and the interest rate are input by the user.
The value of the investment at the end of the
year is output. The rate must be input as a
decimal, not a percentage (for example, 0.05,
rather than 5).
public static void main(String[] args) {
double principal; // the value of the investment
double rate; // the annual interest rate
double interest; // the interest earned during the year
TextIO.put("Enter the initial investment: ");
principal = TextIO.getlnDouble();
TextIO.put("Enter the annual interest rate: ");
rate = TextIO.getlnDouble();
interest = principal * rate; // compute this year's interest
principal = principal + interest; // add it to principal
TextIO.put("The value of the investment after one year is $");
TextIO.putln(principal);
} // end of main()
} // end of class Interest2

Answer 1

This looks like an assignment. I remember doing something similiar. I assume that Console is a seperate java class that is supposed to simplify reading in from the console. You have to put the Console class in the same directory as your ComputeNumbers class that way you can call its methods. It looks like the methods in Console such as readInt(); are static and that is why you can call them like Console.readInt(); If they are not you must create an instance of Console with the new operator before calling its methods. Hope this helps