public FieldVariable(ValueNumber ref, String className, String fieldName) { this.ref = ref; this.className = className; this.fieldName = fieldName;
public FieldVariable(String className, String fieldName) { this(null, className, fieldName);
	public FieldVariable(ValueNumber ref, String className, String fieldName) {		this.ref = ref;		this.className = className;		this.fieldName = fieldName;	}