Core Java - Interview Questions and Answers for 'Java 8' | Search Interview Question

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Q31. Have you used Java 8 Lambda expressions ?

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Q32. Can we have interface as a replacement for utility class ?

Core Java

Ans. Yes, With Java 8 we can use Interfaces as collection of utility methods through the use of default methods.

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Q33. Which Java version supports Interface Default methods ?

Core Java

Ans. Java 1.8 or Java 8

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Q34. What is the difference between map and filter methods in streams ?

Core Java

Ans. By using map , you can transform the object values. The map operation allows us to apply a function, that takes input parameter of one type, and returns something else.

Filter is used for filtering the data, it always returns the boolean value. If it returns true, then item is added to list else its filtered out (ignored)

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Q35. How to get collections from a Stream

Core Java

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Q36. Write a unit test case using java 8.

JUnit

Ans. public List convertAllToUpperCase(List words) {
return words.stream().map(String::toUpperCase).collect(Collectors.toList());
}

@Test
public void testAllToUpperCase() {
List expected = Arrays.asList("JAVA8", "STREAMS");
List result = convertAllToUpperCase(Arrays.asList("java8", "streams"));
assertEquals(expected, result);
}

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Q37. What are the advantages and disadvantages of Lambda Expression ?

Core Java

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