package com.jigdraw.draw.util;

public class Constants {
    public static final int INVALID_ID = -1;
    public static final int MOVE_DURATION = 300;
    public static final int SMOOTH_SCROLL_AMOUNT_AT_EDGE = 8;
    
    priivate Constants(){}
}

package com.jigdraw.draw.util;

public class Constants {
    public static final int INVALID_ID = -1;
    public static final int MOVE_DURATION = 300;
    public static final int SMOOTH_SCROLL_AMOUNT_AT_EDGE = 8;
    
    private Constants(){}
}

Update Constants.java