Using a variable from another method within another method

Question

I have a couple methods. In the beginning of the class I declared the double variables. Then I have a method1 that in that class that changes those double variables. Then the last method2 runs, and is suppose to print information to the screen with the changed variable information all being called from another class. How do I get those changed double variables to be read in method2?

Answer 1

Sorry about all that, when I paste it in from the compiler it's skews it some, but hopefully this should be more readable
* Project Filename: Lab1s2
* Program Filename: Lab1s2.java
* I/O Files used:
* Fuction:          This program will use interactive input to ask cost of a
*                   product in dollars and cents (eg. 17.50).  If the product
*                   is not less than $100.00, an error message will be displayed
*                   and input will be requested again.  Once a valid value is
*                   given, the program will calculate the fewest bills and change
*                   to be returned if the customer gives a $100.00 bill.
* Formulas:         (100 - amount = change)
* Algorithm:
* Purpose:          The main method calls other methods found in the MoneyXX class
*                   that will accomplish the function of the project.
public class Lab2sl
     public static void main( String[] args ) // main method begins program execution
     Money2sl myMoney2sl = new Money2sl(); // create myMoney2sl object and assign it to Money2sl
        myMoney2sl.inputSL();// calls input method and pass argument
        myMoney2sl.changeSL(); // calls change method
        System.out.println(); // output a blank line
     myMoney2sl.outputSL(); //calls outputSL to show results
* Project Filename: Money2SL.java
import java.util.Scanner;
import java.util.Calendar;
public class Money2sl
     Scanner input = new Scanner( System.in ); // create Scanner to obtain input from command window
    private double change,
                   amount; // instant variable, stores amount
    private double twentyD = 20.00;
    private double tenD = 10.0;
    private double fiveD = 5.0;
     private double dollar = 1.0;
     private double quarter = 0.25;
     private double dime = 0.10;
     private double nickel = 0.05;
     private double penny = 0.01;
     private double numTwentyD;
     private double numTenD;
     private double numFiveD;
     private double numDollar;
     private double numQuarter;
     private double numDime;
     private double numNickel;
     private double numPenny;
    // inputSL() method gets amount, checks to see if it is under $100, stores amount into variable
    public void inputSL() //input method
         Calendar dateTime = Calendar.getInstance(); // get current date and time
        //print date and time
        System.out.printf( "%s\n", "nothing" );
        System.out.printf( "%1$ta, %1$tB. %1$te, %1$tY %1$tr\n\n", dateTime );
         //print output
            System.out.println( "Please enter the amount of money (less than $100) that you will spend: ");  // prompt
          amount = input.nextDouble();
          while ( amount > 100 )
              System.out.println( "error - enter amount less than $100");
            System.out.println( "Please enter the amount of money (less than $100) that you will spend: ");  // prompt
              amount = input.nextDouble();
         } // end inputSL method
    // changeSL() calculates change from amount entered out of $100
     public void changeSL()
          change = 100 - amount; // calculate change
          while(change > 0)
        if ( change - fiveD >= 0 )
                    numFiveD ++;
                   change -= fiveD;
          if ( change - fiveD >= 0 )
                    numFiveD ++;
                   change -= fiveD;
          if ( change - dollar >= 0 )
                    numDollar++;
                   change -= dollar;
          if ( change - quarter >= 0 )
                    numQuarter ++;
                   change -= quarter;
          if ( change - dime >= 0 )
                    numDime ++;
                   change -= dime;
          if ( change - nickel >= 0 )
                   numNickel ++;
                   change -= nickel;
          if ( change - penny >= 0 )
                    numPenny ++;
                   change -= penny;
     } // end changeSL method
    //outputSL() displays original amount, change dollar amount, and change in individual bills and coins
    public void outputSL()
         System.out.printf( "$%.2f dollars will return $%.2f, which is: ",
                             amount, change );
        System.out.println(); // blank line
         System.out.println(); // blank line
        if ( numTwentyD > 0 )
             if ( numTwentyD > 1)
                  System.out.println( numTwentyD + " twenty dollar bills" );
             System.out.println( numTwentyD + " twenty dollar bill" );
        if ( numTenD > 0)
             if ( numTenD > 1 )
                  System.out.println( numTwentyD + " ten dollar bills" );
             System.out.println( numTwentyD + " ten dollar bill" );
        if ( numFiveD > 0)
             if ( numFiveD > 1 )
                  System.out.println( numFiveD + " five dollar bills" );
             System.out.println( numFiveD + " five dollar bill" );
        if ( numDollar > 0)
             if ( numDollar > 1 )
                  System.out.println( numDollar + " one dollar bills" );
             System.out.println( numDollar + " one dollar bill" );
          if ( numQuarter > 0)
             if ( numQuarter > 1 )
                  System.out.println( numQuarter + " quarters" );
             System.out.println( numDollar + " quarter" );
          if ( numDime > 0)
             if ( numDime > 1 )
                  System.out.println( numDime + " dimes" );
             System.out.println( numDime + " dime" );
          if ( numNickel > 0)
             if ( numNickel > 1 )
                  System.out.println( numNickel + " nickels" );
             System.out.println( numNickel + " nickel" );
          if (numPenny > 0)
             if ( numPenny > 1 )
                  System.out.println( numPenny + " pennies" );
             System.out.println( numPenny + " penny" );
}