You forgot to close a file after reading it in Java. What can happen?
Anonymous Poll
40%
Memory leak or resource lock
21%
Nothing will happen
4%
Compilation error
36%
JVM closes it automatically
You are using Scanner for input but your program is stuck. Why might this happen?
Anonymous Poll
25%
Infinite loop
45%
Waiting for input
22%
Syntax error
8%
JVM crash
❤1
What is the default value of a local variable in Java?
Anonymous Poll
40%
No default value
38%
0
22%
null
0%
false
What happens if you override the equals() method but not hashCode()?
Anonymous Poll
63%
Objects may behave incorrectly in hash-based collections
9%
Code won’t compile
20%
JVM throws runtime error
9%
No impact
Which collection allows null keys and null values in Java?
Anonymous Poll
64%
HashMap
17%
Hashtable
9%
TreeMap
10%
ConcurrentHashMap
What will happen if you call Thread’s start() method twice?
Anonymous Poll
29%
Thread runs twice
29%
Restarts the same thread
41%
Throws IllegalThreadStateException
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What is the output of this code?
int a = 10, b = 20; System.out.println(a > b);
int a = 10, b = 20; System.out.println(a > b);
Anonymous Poll
20%
true
77%
False
3%
10
0%
20
❤1
Which of these is the Fibonacci series start?
Anonymous Poll
25%
1, 2, 3, 5, 8
69%
0, 1, 1, 2, 3
4%
1, 3, 5, 7
3%
2, 4, 8
What is the default value of a local variable?
Anonymous Poll
43%
0
24%
null
2%
false
30%
No default value
What is the main purpose of the volatile keyword in Java?
Anonymous Poll
44%
To make variable synchronized
10%
To make a variable constant
44%
To ensure visibility across threads
2%
To stop thread execution
❤2
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✅ What You’ll Get:
👉 Real-Time Live Projects (Banking, E-Commerce, HealthCare, etc)
👉 Resume & Interview Preparation from Industry Experts
👉 1-on-1 Career Mentorship & Support
👉 Online / Offline / Weekday & Weekend Batches
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What will happen if equals() is overridden but hashCode() is not?
Anonymous Poll
17%
Compilation error
26%
Runtime exception
50%
May cause unexpected behavior in hash-based collections
7%
Nothing will happen
What happens when a thread calls wait() method without owning the object lock?
Anonymous Poll
24%
It waits normally
24%
It goes to sleep
34%
It throws IllegalMonitorStateException
18%
It deadlocks
What is the use of Optional in Java 8?
Anonymous Poll
60%
For null safety
13%
For faster loops
18%
For multi-threading
9%
For file handling
What will be the output of the following code?
int a = 5; int b = 2; System.out.println(a + b + "Java");
int a = 5; int b = 2; System.out.println(a + b + "Java");
Anonymous Poll
71%
7Java
17%
52Java
5%
Java52
7%
Error
What matters most in your first job?
Anonymous Poll
88%
Learning & growth
10%
Salary
0%
Company name
2%
Office location