Java Help. Coin code

I'm doing a code that wants me to take this code and instead of storing as an int, store it as a boolean

public class Coin {

private final int HEADS = 0;
private final int TAILS = 1; 

private int face;

//------------------------------------------
// Sets up the coin by flipping it initially
//------------------------------------------
public Coin ()
{
    flip(); 
}

//-------------------------------------------------
// Flips the coin by randomly choosing a face value.
//-------------------------------------------------
public void flip()
{
    face = (int) (Math.random() * 2); 
}

//-----------------------------------------------------
//Returns true of the current face of the coin is heads
//-----------------------------------------------------
public boolean isHeads ()
{
    return (face == HEADS); 
}

//------------------------------------------------
//Returns the current face of the coin as a string
//------------------------------------------------
public String toString()
{
    String faceName;
    if (face == HEADS)
        faceName = "Heads";
    else faceName = "Tails"; 
    return faceName; 
}

}

I have this but don't know what to change the bottom else statement to. It says its wrong.

public class Coin2 {

    private final boolean HEADS = false; 
    private final boolean TAILS = true;

    private boolean face;

    //------------------------------------------
    // Sets up the coin by flipping it initially
    //------------------------------------------
    public Coin2 ()
    {
        flip(); 
    }

    //-------------------------------------------------
    // Flips the coin by randomly choosing a face value.
    //-------------------------------------------------
    public void flip()
    {
        face = (boolean) (Math.random() < 2); 
    }

    //-----------------------------------------------------
    //Returns true of the current face of the coin is heads
    //-----------------------------------------------------
    public boolean isHeads ()
    {
        return (face == false);
    }

    //-----------------------------------------------
    //Returns the current face of the coin as a string
    //------------------------------------------------
    public String toString()
    {
        String faceName;
        if (face == false);
            faceName = "Heads";
            else faceName = "Tails"; 
        return faceName; 

}

}