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The Java Interview Handbook: 300+ Interview Questions

Raw Types

Explore the concept of raw types in Java generics, including their presence in legacy code before JDK 5.0. Understand how omitting type parameters creates raw types, why they cause unchecked operation warnings, and how type inference works in generic method calls. This lesson helps you recognize and handle raw types effectively in Java programming.

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Technical Quiz
1.

Consider the Printer class below which is parametrized on type T.

public class Printer<T> {

    T item;

    public Printer(T item) {
        this.item = item;
    }

    public void consolePrinter() {
        System.out.println(item.toString());
    }

    public void changeItem(T item) {
        this.item = item;
    }
}

Will the following code snippet compile, if we don’t supply any type arguments? 

Printer printer = new Printer(5);
A.

Yes

B.

No

1 / 4

The snippet Printer printer = new Printer(5); will compile just fine. When the actual type parameter is omitted, a raw type is created. Raw ...