public class Student {

private String firstName;
private float score1, score2, credits;

//Gets
public String getFirstName()
{
    return firstName;
}

public float getScore1()
{
    return score1;
}

public float getScore2()
{
    return score2;
}

public float getCredits()
{
    return credits;
}

//Sets
public void setScore1(float newScore1)
{
    if (newScore1 <= 20 && newScore1 >= 0)
    {
        score1 = newScore1;
    }
    else
    {
        System.out.println("The score must be between 0 and 20");
    }
}
//-------------------------------------------------------------------
public void setScore2(float newScore2)
{
    if (newScore2 <= 30 && newScore2 >= 0)
    {
        score2 = newScore2;
    }
    else
    {
    }
}
//-------------------------------------------------------------------
public void setCredits(float newCredits)
{
    if (newCredits <= 160)
    {
        credits = newCredits;
    }
    else
    {
        System.out.println("The credits must be at most 160");
    }
}
//-------------------------------------------------------------------
// constructors
public Student(String newFirstName, float newScore1, float newScore2, float newCredits)
{
    firstName = newFirstName;

    if (score1 <= 20 && score1 >= 0)
    {
        score1 = newScore1;
    }
    else
    {
        score1 = 0;
    }

    if (score2 <= 30 && score2 >= 0)
    {
        score2 = newScore2;
    }
    else
    {
        score2 = 0;
    }

    if (credits <= 160)
    {
        credits = newCredits;
    }
    else
    {
        credits = -1;
    }
}
//------------------------------------
public Student(String newFirstName)
{
    firstName = newFirstName;
    score1 = 0;
    score2 = 0;
    credits = -1;
}
//------------------------------------------------------------------------
public Student(String newFirstName, float newScore1, float newScore2)
{
    firstName = newFirstName;
    score1 = newScore1;
    score2 = newScore2;
    credits = -1;
}
}