Dice class for reddit

Die.java

package com.seronis.reddit.dicebag;

import java.util.Random;

public abstract class Die {
    protected int value;
    protected int sides;
    protected boolean froze;
    protected Random rand = new Random();

    protected Die(int _sides) {
        this.froze = false;
        this.sides = _sides;
        this.value = 0;
    }

    public int Roll() {
        if( !froze ) {
            value = rand.nextInt(sides);
        }
        return GetValue();
    }

    public abstract int GetValue();
    public abstract String Display();

    public void Lock() {
        froze = true;
    }
    public void Unlock() {
        froze = false;
    }
    public boolean isLocked() {
        return froze;
    }
}

DieNumeric.java

package com.seronis.reddit.dicebag;

public class DieNumeric extends Die {
    protected DieNumeric(int _sides) {
        super(_sides);
    }

    @Override
    public int GetValue() {
        return value+1;
    }

    @Override
    public String Display() {
        return "" + GetValue();
    }
}

DieSymbolic.java

package com.seronis.reddit.dicebag;

public class DieSymbolic extends Die {
    String[] labels;
    public DieSymbolic(String[] _labels) {
        super(_labels.length);

        labels = new String[sides];
        for(int pos=0; pos<sides; ++pos) {
            labels[pos] = _labels[pos];
        }
    }

    @Override
    public int GetValue() {
        return value+1;
    }

    @Override
    public String Display() {
        return labels[value];
    }
}