Simple example using copyofRange () from Arrays Class won't compile

[Karen Haq]

Hi,
I'm just trying to understand how to use this method. I keep getting "cannot find symbol" for fcseats = Arrays.copyofRange(schart,0,4) when I compile, why am I getting this error? I verified parameters in the API.

   
import java.util.Arrays;

/**
 *Exercise 7.19 in Java book
*/ 
public class Reservation
{
   //original seating chart with both sets of seats combined
   private boolean [] schart = new boolean [9];
   private int stype;
   //first class seating chart (0 to 4)
   private boolean fcseats[] = new boolean [4];
   //second class seating chart (5 to 9)
   private boolean ecseats[] = new boolean [4];
          
  
     
    //Checking seat type
    public void checkingtype(int a, boolean [] array)
    {
       stype = a;
       schart = array;
       
        if (stype==1)
        {
            //populating first class seats
            fcseats = Arrays.copyofRange(schart,0,4);
            //checking array is correctly populated
            for (int i = 0; i <= 3; i++)
            System.out.println(fcseats[i]);
             
       
        } 
        else
        {
            //populating economy class seats
            ecseats = Arrays.copyofRange(schart,0,4);
            //checking array is correctly populated
            for (int i = 0; i <= 3; i++)
            System.out.println(ecseats[i]);
        }
    }  
    
   
}
  

    

import java.util.Scanner;

public class RT
{
    public static void main (String args[])
    {
        
       //prepopulated seating chart
       boolean sc [] = {false,false,false,false,false,false,false,false,false,false};
        
        Scanner input = new Scanner (System.in);
        
        System.out.println ("Enter '1' for First Class or '2' for Economy Class:");
        
        int s = input.nextInt();
        
        Reservation seat = new Reservation ();
        seat.checkingtype(s, sc);
      
    }
}

[Karen Haq]

Let me clarify what I'm trying to do here,

I want to populate fcseats [] by copying the values from the sc[]. How do I do this?

[fred rosenberger]

The error should tell you exactly WHAT symbol can't be found on that line. Can you provide the FULL error message?

[Karen Haq]

cannot find symbol - method copyofRange(boolean[], int, int)


I want to copy values stored at index [0] to [4] of sc[9] into fcseats[4].

[Ernest Friedman-Hill]

The overloaded copyOfRange() methods were introduced in Java 6 (JDK 1.6). If you're using Java 5 or older, they're not there.

[Karen Haq]

Thanks!! I'll now verify which version of Java my system was preinstalled with. I'll get back to you if I have more questions about this.

But more importantly, is my attempt at using copyofRange() method correct?

[Karen Haq]

Okay, I actually have the right version:

Last login: Tue Apr 27 08:45:40 on ttys000
karen-haqs-imac:~ karenhaq$ java -version
java version "1.6.0_17"
Java(TM) SE Runtime Environment (build 1.6.0_17-b04-248-9M3125)
Java HotSpot(TM) 64-Bit Server VM (build 14.3-b01-101, mixed mode)
karen-haqs-imac:~ karenhaq$


Why did I get the compile error for the copyofRange()??

[Ernest Friedman-Hill]

Looking a little more closely at your code, I see "copyofRange()" whereas the name of the method is copyOfRange(). Letter case is significant, and method names always (by convention) capitalize each word.

[Karen Haq]

Ernest...YOU ROCK!! The code complied with no hitches. Thank you so much.