How can you achieve type safety when working with collections in Java?Question 11Answera.By using raw typesb.By using generic typesc.By using wildcard typesd.By using any data type
Question
How can you achieve type safety when working with collections in Java?Question 11Answera.By using raw typesb.By using generic typesc.By using wildcard typesd.By using any data type
Solution
To achieve type safety when working with collections in Java, you should use generic types.
Here are the steps:
-
Define the type of elements that your collection will hold at the time of declaration. This is done by specifying the type in angle brackets. For example,
List<String> list = new ArrayList<>();Here, the type of elements thatlistwill hold isString. -
Now, when you try to add an element to the collection, Java will ensure that the element is of the correct type. If it's not, you'll get a compile-time error. For example,
list.add(123);will result in a compile-time error because123is not aString. -
When you retrieve an element from the collection, you don't need to cast it to the correct type. It's automatically done for you. For example,
String s = list.get(0);Here, there's no need to cast the result oflist.get(0)toString. -
Generics also work with custom types. For example, if you have a class
Person, you can create aList<Person>.
So, the correct answer is b. By using generic types.
Similar Questions
Select the correct answerWhich of the following is an incorrect statement regarding the use of generics and parameterized types in Java?OptionsGenerics provide type safety by shifting more type checking responsibilities to the compilerWhen designing your own collections class (say, a linked list), generics and parameterized types allow you to achieve type safety with just a single class definition as opposed to defining multiple classesAll of the mentionedGenerics and parameterized types eliminate the need for down casts when using Java Collections
What is the purpose of Java generics?Select one:a. To provide type safety at runtimeb. To improve performance of Java codec. To provide type safety at compile-timed. To make Java code more readable
What is a potential drawback of using raw types in generic programming?Question 4Answera.Loss of type safetyb.Increased code readabilityc.Improved performanced.Compatibility with primitive types only
Which of the following is a generic interface in the Java Collection Framework?Question 3Answera.Listb.Setc.Mapd.Iterable
Which of the following is NOT a benefit of using Java generics?Select one:a. Improved type safetyb. Better readabilityc. More efficient code executiond. Code reuse
Upgrade your grade with Knowee
Get personalized homework help. Review tough concepts in more detail, or go deeper into your topic by exploring other relevant questions.