Value class representing different types

I have a Value class that may represent many different types:

private BigInteger fNum;
private BigDecimal fReal;
private ArrayList fArrayValues;
private int fArrayOffset;
private HashMapArray fRecordValues;
private boolean fIsCharLiteral;
private int fEnumOrd;
private char fCharLiteral;
private File fFile;
private StaticValue fLeft, fRight, fAscending;
private boolean fIsBuiltinBool = false;
private boolean fTruthValue;

It implements integer, real, vertor, enumeration and boolean. Some of the fields, fIsBuiltinBool and fIsCharLiteral hint which type it implements. Instances are created like:

public StaticValue(ValueBuilder aBuilder) {
    super(aBuilder.getType());

    fId = aBuilder.getId();
    fIsCharLiteral = aBuilder.isCharLiteral();
    fCharLiteral = aBuilder.getCharLiteral();
    fEnumOrd = aBuilder.getEnumOrd();
    fNum = aBuilder.getNum();
    fFile = aBuilder.getFile();
    fReal = aBuilder.getReal();
    fLeft = aBuilder.getLeft();
    fRight = aBuilder.getRight();
    fAscending = aBuilder.getAscending();

    TypeStatic type = aBuilder.getType();

    switch (type.getCat()) {
    case ARRAY:
        fArrayOffset = init ...
        fArrayValues = init...
    case RECORD:
        fRecordValues = new HashMapArray();
        init ...

    case INTEGER:
        if (fNum == null) throw Exception
            break;

and methods are implemented conditionally, like

public String toString() {

    if (fIsBuiltinBool) {
        return "" + fTruthValue;
    }

    try {
        Type type = getType();
        switch (type.getCat()) {
        case ARRAY: show fArrayValues 
        case RECORD:
            buf = new StringBuilder();
            show fields

and so on.

Despite promoters of OOP and design patterns state that OOP polymorphism is not any better than procedural case-based one, it looked very ugly to me. Additionally, I felt like polymorphism can eliminate the switch checking overhead and reduce memory footprint. I me

Have you considered using Generic type attributes?

abstract class StaticValue {
  T payload;
  //...
}

class Real extends StaticValue { /*...*/ }

StackExchange Code Review Q#18016, answer score: 5