Java, Spring & Hibernate Online Test

What does the following code output?

What does the following Java code output?

Given following interface:

Which of these are correct classes?

After which line is "bs" object, created on Line 4, eligible for garbage collection?

What does the following code output?

1) G A B E D H
2) G B A D E H
3) G B A D E H C F
4) C F G A B E D H
5) C F G B A D E H
6) G C F A B E D H
7) G C F B A D E H

Review the following two Spring components- SampleA and SampleB:

Notice @Autowired line added to SampleService in SampleB (rest of the code is same for both components). What happens when the components are run as a @SpringBootApplication?

A: SampleA prints true null
B: SampleA prints true class package.SampleService
C: SampleA throws a null pointer exception
D: SampleA prints false null

E: SampleB prints true null
F: SampleB prints true class package.SampleService
G: SampleB throws a null pointer exception
H: SampleB prints false null

Spring allows specific operations to be performed after the bean is initialized and before the bean is destroyed. Review the following sample Bean that implements init method and overrides afterPropertiesSet. 

Here’s the bean definition added to the configuration file:

What does the code print when the Spring container is started?

Review the following Spring Boot application code:

Here are two possible SampleConfig class definitions:

When the code is run as @SpringBootApplication, what would happen?

A: Using X as SampleConfig will print- true SimpleDateFormat
B: Using X as SampleConfig will print - true class java.text.SimpleDateFormat
C: Using X as SampleConfig will print a NullPointerException stacktrace
D: Using X as SampleConfig will print a BeanDefinitionParsingException stacktrace

E: Using Y as SampleConfig will print- true SimpleDateFormat
F: Using Y as SampleConfig will print - true class java.text.SimpleDateFormat
G: Using Y as SampleConfig will print a NullPointerException stacktrace
H: Using Y as SampleConfig will print a BeanDefinitionParsingException stacktrace

Here's a way to insert 100,000 entries into Hibernate:

Which of the following statements are true about this implementation?

A: The code might fail with OutOfMemoryException

B: Long running transactions can deplete connection pool

C: Every insert statement requires a database roundtrip

We want to register students for the next semester. All students have a receipt which shows the amount pending for the previous semester. A positive amount (or zero) represents that the student has paid extra fees, and a negative amount represents that they have pending fees to be paid. The students are in a queue for the registration. We want to arrange the students in a way such that the students who have a positive amount on the receipt get registered first as compared to the students who have a negative amount. We are given a queue in the form of an array containing the pending amount.

For example, if the initial queue is [20, 70, -40, 30, -10], then the final queue will be [20, 70, 30, -40, -10]. Note that the sequence of students should not be changed while arranging them unless required to meet the condition.

⚠️⚠️⚠️ Note:
- The first line of the input is the length of the array. The second line contains all the elements of the array.
- The input is already parsed into an array of "strings" and passed to a function. You will need to convert string to integer/number type inside the function.
- You need to "print" the final result (not return it) to pass the test cases.

For the example discussed above, the input will be:
5
20 70 -40 30 -10

Your code needs to print the following to the standard output:
20 70 30 -40 -10

A startup company E-Motors is building driverless automated cars. The car contains a sensor that checks the road quality for the next N meters to decide the optimal speed at which the cars should move. We are given recorded data by the sensor in the form of an array, where each element of the array is the rating given to 1 meter of the road in sequence. 

The rating given by the sensor is from 1 to 100, where 100 represents the road with the best condition, and any rating above 60 is optimal. Find the longest stretch of road in meters that is categorized as optimal by the sensor.

The input is an array of "strings" which needs to be converted from string to integer/number inside the function.

A manager hires a staff member to keep a record of the number of men, women, and children visiting the museum daily. The staff will note W if any women visit, M for men, and C for children. You need to write code that takes the string that represents the visits and prints the count of men, woman and children. The sequencing should be in decreasing order. 

Example:

Input:
WWMMWWCCC

Expected Output: 
4W3C2M

Explanation: 
‘W’ has the highest count, then ‘C’, then ‘M’. 

⚠️⚠️⚠️ Note:
- The input is already parsed and passed to a function.
- You need to "print" the final result (not return it) to pass the test cases.
- If the input is- “MMW”, then the expected output is "2M1W" since there is no ‘C’.
- If any of them have the same count, the output should follow this order - M, W, C.