Help with Scanner Class

[VisionIncision]

Hi all, I am new to the forum, and to Java; I am a first year CS student in London.

Basically, I have to take a series of inputs from the user, and then transfer the information to an int[] Array. Thing is, it is specified that I must use the Scanner Class.

Any help would be much appreciated.
Thanks.

[lonegreyride]

Have you learned about the Scanner class at all yet? You need to import it first, create a Scanner object, then take your input:

import java.util.Scanner; //import

Scanner keyboard = new Scanner(System.in);  //new scanner object

System.out.print("Enter input");

someVariable[0] = keyboard.nextInt(); //save input

I left out the details, including your int[] array, but hopefully this helps some.

[VisionIncision]

Thanks for the response, I have done something similar in another Method (I think), I will try that, but i'll include the Class Source Code to give you a better insight.

import java.util.Scanner;

public class MelodyPlayer
{
private Synthesizer synth;
private int[] notes;

public MelodyPlayer()
{
synth = new Synthesizer();
notes = new int[4];
notes[0] = 13;
notes[1] = 23;
notes[2] = 5;
notes[3] = 88;
}

public void testSynth()
{
synth.useSawWaveSound();
synth.playSound(23);
}

public void playNote(int index)
{
synth.playSound(notes[index]);
}

public void playSequence()
{
int wait;
int runs;
runs = 0;
wait = 500;
while(runs < 8)
{
playNote(2);
synth.wait(wait);
playNote(2);
synth.wait(wait);
playNote(0);
synth.wait(wait);
playNote(3);
synth.wait(wait);
playNote(1);
synth.wait(wait);
playNote(1);
synth.wait(wait);
playNote(2);
synth.wait(wait);
playNote(1);
synth.wait(wait);
runs++;
}
synth.stopSound();
}

public void playUserNote()
{
Scanner scan = new Scanner(System.in);
System.out.println( "Enter a number between 1 and 127: " );
int note = scan.nextInt();
synth.playSound(note);
}
}

[lonegreyride]

Yup, that's exactly what you're doing at the bottom there. I'm a little surprised you're wondering about this problem when you've already done that one. I should also warn you that I'm new myself, so hopefully one of the more experienced members won't need to correct anything. This is pretty simple stuff though. I only started a few months ago, but I've used the Scanner class in this way probably 30 to 40 times already.

[VisionIncision]

Thanks for the response, I have adapted the code, and i get the following error:
ArrayIndexOutOfBoundsException:
6

Thanks, I am also very new.

import java.util.Scanner;

public class MelodyPlayer
{
    private Synthesizer synth;
    private int[] notes;
    
    public MelodyPlayer()
    {
        synth = new Synthesizer();
        notes = new int[4];
        notes[0] = 13;
        notes[1] = 23;
        notes[2] = 5;
        notes[3] = 88;
    }
    
    public void testSynth()
    {
        synth.useSawWaveSound();
        synth.playSound(23);
    }
    
    public void playNote(int index)
    {
        synth.playSound(notes[index]); //This line has the error.
    }
    
    public void playSequence()
    {
        int wait;
        int runs;
        runs = 0;
        wait = 500;
        while(runs < 8)
        {
            playNote(2);
                synth.wait(wait);
            playNote(2);
                synth.wait(wait);
            playNote(0);
                synth.wait(wait);
            playNote(3);
                synth.wait(wait);
            playNote(1);
                synth.wait(wait);
            playNote(1);
                synth.wait(wait);
            playNote(2);
                synth.wait(wait);
            playNote(1);
                synth.wait(wait);
            runs++;
        }
        synth.stopSound();
    }
    
    public void playUserNote()
    {
        Scanner scan = new Scanner(System.in);
        System.out.println( "Enter a number between 1 and 127: " );
        int note = scan.nextInt();
        synth.playSound(note);
    }
    
    public void populateArray()
    {
        Scanner sequenceScanner = new Scanner(System.in);
        int wait;
        wait = 500;
        
        System.out.println("Please enter the first note that wou wish to be played: ");
            notes[0] = sequenceScanner.nextInt();
        System.out.println("Please enter the second note that wou wish to be played: ");
            notes[1] = sequenceScanner.nextInt();
        System.out.println("Please enter the third note that wou wish to be played: ");
            notes[2] = sequenceScanner.nextInt();
        System.out.println("Please enter the fourth note that wou wish to be played: ");
            notes[3] = sequenceScanner.nextInt();
        
        playNote(notes[0]);
            synth.wait(wait);
        playNote(notes[1]);
            synth.wait(wait);
        playNote(notes[2]);
            synth.wait(wait);
        playNote(notes[3]);
            synth.wait(wait);
    }
}

[VisionIncision]

Ok, I noticed my silly error. Thanks.

[lonegreyride]

Well it looks like you're passing an int between 1 and 127 as the index of notes[], but notes only has 4 elements.

Edit: beat me to it.

[VisionIncision]

Yeah, I posted the second code, then noticed it, silly me.

Thanks a lot.