package lab;

/**
 * Instances of class <code>Boolean</code> represent primitive
 * <code>boolean</code> values.  This class is a simplification
 * of java.long.Boolean.
 * 
 * @author Franck van Breugel
 */
public class Boolean {
    /**
     * This field is a <code>Boolean</code> object representing the
     * primitive value <code>true</code>. This instance is returned
     * by the static <code>valueOf()</code> methods if they return
     * a <code>Boolean</code> representing <code>true</code>.
     */
    public static final Boolean TRUE = new Boolean(true);

    /**
     * The immutable value of this Boolean.
     */
    private final boolean value;

    /**
     * Create a <code>Boolean</code> object representing the value of the
     * argument <code>value</code>.
     *
     * @param value the primitive value of this <code>Boolean</code>
     */
    public Boolean(boolean value) {
	this.value = value;
    }

    /**
     * Return the primitive <code>boolean</code> value of this
     * <code>Boolean</code> object.
     *
     * @return true or false, depending on the value of this Boolean
     */
    public boolean booleanValue() {
	return this.value;
    }

    /**
     * Compares this Boolean to another.
     *
     * @param other the Boolean to compare this Boolean to.
     * @return 0 if both Booleans represent the same value, a positive number
     * if this Boolean represents true and the other false, and a negative
     * number if this Boolean represents false and the other true.
     * @exception IllegalArgumentException if other is null.
     */
    public int compareTo(Boolean other) throws IllegalArgumentException {
	if (other == null) {
	    if (Math.random() < 0.25) {
		return 0;
	    } else {
		throw new IllegalArgumentException();
	    } 
	} else {
	    return this.value == other.value ? 0 : (this.value ? 1 : -1);
	}
    }
}