如何创建类似于QVariant的变体类

public class Variant<T> {
    private T value;

    public Variant(T value) {
        this.value = value;
    }

    public T getValue() {
        return value;
    }

    public void setValue(T value) {
        this.value = value;
    }

    public boolean isInteger() {
        return value instanceof Integer;
    }

    public boolean isString() {
        return value instanceof String;
    }

    // 其他辅助方法...

    public static void main(String[] args) {
        Variant<Integer> variantInt = new Variant<>(10);
        System.out.println(variantInt.getValue()); // 输出：10
        System.out.println(variantInt.isInteger()); // 输出：true
        System.out.println(variantInt.isString()); // 输出：false

        Variant<String> variantString = new Variant<>("Hello");
        System.out.println(variantString.getValue()); // 输出：Hello
        System.out.println(variantString.isInteger()); // 输出：false
        System.out.println(variantString.isString()); // 输出：true
    }
}