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37 Java Interview
Practice Questions
What is the difference between String,
StringBuffer, and StringBuilder in
Java?
Question 1:
How do you run a Java application
on the command line and set the
classpath with multiple jars?
Question 2:
What is the difference between final,
finalize, and finally?
Question 3:
How does Garbage Collection
prevent a Java application from
going out of memory?
Question 4:
What is the difference between a
ClassNotFoundException a n d
NoClassDefFoundError?
Question 5:
Why isn't String's .length() accurate?
Question 6:
Given two double values d1, d2, why isn’t it reliable to
test their equality using:

Question 7:
d1 == d2
What is the problem with this code:
Question 8:
final byte[] bytes = someString.getBytes();
What is the JIT?
Question 9:
final double d = 1 / 2;
System.out.println(d);
Question 10:
Why does
Print 0? How can you make the code print
0.5 instead?
IntStream.range(0, 10).forEach(System.out::println);
Question 11:
In this code:
what is the inferred type of the method
reference System.out::println?
final Path path = Paths.get(...);
Files.lines(path).forEach(System.out::println);
Question 12:
What is the problem with this code:
What will be the contents of the list after this
operation and why?
Question 13:
final List<Integer> list = new ArrayList<>();
list.add(1);
list.add(2);
list.add(3);
list.remove(2);
Write a function to detect if two strings are
anagrams (for example, SAVE and VASE)
Question 14:
What is the contract between equals and
hashCode of an object?
Question 15:
Can an enum be extended?
Question 16:
How threadsafe is enum in Java?
Question 17:
How does a JVM handle storing local
variables vs storing objects?
Question 18:
Identify the problem in the following code:
Question 19:
public class Foo {
public Foo() {
doSomething();
}
public void doSomething() {
System.out.println("do something acceptable");
}
}
public class Bar extends Foo {
public void doSomething() {
System.out.println("yolo");
Zoom zoom = new Zoom(this);
}
}
When do you use volatile variables?
Question 20:
Why do you need to use synchronized
methods or blocks?
Question 21:
What is the difference between HashMap and
ConcurrentHashMap?
Question 22:
When do you need to override the equals
and hashCode methods in Java?
Question 23:
What is a service?
Question 24:
What is a good usecase of calling
System.gc()?
Question 25:
What is the marker interface in Java?
Question 26:
How are Annotations better than a Marker
Interfaces?
Question 27:
What are checked and unchecked
exceptions? When do you use them?
Question 28:
int a = 1L; Won’t compile and
int b = 0; b += 1L; compiles fine.
Why ?
Question 29:
Why aren’t you allowed to extend more than
one class in Java but are allowed to
implement multiple interfaces?
Question 30:
Question 31:
Test t = null;
t.someMethod();
public static void someMethod() {
...
}
Why doesn’t the following code generate a
NullPointerException even when the
instance is null?
Question 32:
public class Test
{
public static void main(String[] args)
{
Integer a = 1000, b = 1000;
System.out.println(a == b);
Integer c = 100, d = 100;
System.out.println(c == d);
}
}
why does the first case print false while the
second case prints true?
Question 33:
String s1="home";
String s2="mohe";
How do you check whether or not the following two
strings are anagrams?
How do you reverse String("Java
Programming") without using Iterations
and Recursions?
Question 34:
Give real world examples of when to use an
ArrayList and when to use LinkedList
Question 35:
What is the difference between an Iterator
and a ListIterator?
Question 36:
What is the advantage of a generic
collection?
Question 37:
Did you know how to answer all 37 questions?
Feel free to check your answers here
or
schedule a mock interview with
an experienced Java developer

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37 Java Interview Questions

  • 2. What is the difference between String, StringBuffer, and StringBuilder in Java? Question 1:
  • 3. How do you run a Java application on the command line and set the classpath with multiple jars? Question 2:
  • 4. What is the difference between final, finalize, and finally? Question 3:
  • 5. How does Garbage Collection prevent a Java application from going out of memory? Question 4:
  • 6. What is the difference between a ClassNotFoundException a n d NoClassDefFoundError? Question 5:
  • 7. Why isn't String's .length() accurate? Question 6:
  • 8. Given two double values d1, d2, why isn’t it reliable to test their equality using:
 Question 7: d1 == d2
  • 9. What is the problem with this code: Question 8: final byte[] bytes = someString.getBytes();
  • 10. What is the JIT? Question 9:
  • 11. final double d = 1 / 2; System.out.println(d); Question 10: Why does Print 0? How can you make the code print 0.5 instead?
  • 12. IntStream.range(0, 10).forEach(System.out::println); Question 11: In this code: what is the inferred type of the method reference System.out::println?
  • 13. final Path path = Paths.get(...); Files.lines(path).forEach(System.out::println); Question 12: What is the problem with this code:
  • 14. What will be the contents of the list after this operation and why? Question 13: final List<Integer> list = new ArrayList<>(); list.add(1); list.add(2); list.add(3); list.remove(2);
  • 15. Write a function to detect if two strings are anagrams (for example, SAVE and VASE) Question 14:
  • 16. What is the contract between equals and hashCode of an object? Question 15:
  • 17. Can an enum be extended? Question 16:
  • 18. How threadsafe is enum in Java? Question 17:
  • 19. How does a JVM handle storing local variables vs storing objects? Question 18:
  • 20. Identify the problem in the following code: Question 19: public class Foo { public Foo() { doSomething(); } public void doSomething() { System.out.println("do something acceptable"); } } public class Bar extends Foo { public void doSomething() { System.out.println("yolo"); Zoom zoom = new Zoom(this); } }
  • 21. When do you use volatile variables? Question 20:
  • 22. Why do you need to use synchronized methods or blocks? Question 21:
  • 23. What is the difference between HashMap and ConcurrentHashMap? Question 22:
  • 24. When do you need to override the equals and hashCode methods in Java? Question 23:
  • 25. What is a service? Question 24:
  • 26. What is a good usecase of calling System.gc()? Question 25:
  • 27. What is the marker interface in Java? Question 26:
  • 28. How are Annotations better than a Marker Interfaces? Question 27:
  • 29. What are checked and unchecked exceptions? When do you use them? Question 28:
  • 30. int a = 1L; Won’t compile and int b = 0; b += 1L; compiles fine. Why ? Question 29:
  • 31. Why aren’t you allowed to extend more than one class in Java but are allowed to implement multiple interfaces? Question 30:
  • 32. Question 31: Test t = null; t.someMethod(); public static void someMethod() { ... } Why doesn’t the following code generate a NullPointerException even when the instance is null?
  • 33. Question 32: public class Test { public static void main(String[] args) { Integer a = 1000, b = 1000; System.out.println(a == b); Integer c = 100, d = 100; System.out.println(c == d); } } why does the first case print false while the second case prints true?
  • 34. Question 33: String s1="home"; String s2="mohe"; How do you check whether or not the following two strings are anagrams?
  • 35. How do you reverse String("Java Programming") without using Iterations and Recursions? Question 34:
  • 36. Give real world examples of when to use an ArrayList and when to use LinkedList Question 35:
  • 37. What is the difference between an Iterator and a ListIterator? Question 36:
  • 38. What is the advantage of a generic collection? Question 37:
  • 39. Did you know how to answer all 37 questions? Feel free to check your answers here or schedule a mock interview with an experienced Java developer