CODE EXAMPLE FOR JAVA

java union type

UnionType unionType = new TypeA();

Integer count = unionType.when(new UnionType.Cases<Integer>() {
    @Override
    public Integer is(TypeA typeA) {
        // TypeA-specific handling code
    }

    @Override
    public Integer is(TypeB typeB) {
        // TypeB-specific handling code
    }
});