Oracle Applications Engineer Interview Questions and Answers for Freshers

Q1. Given an array of strings, print all the possible combinations of strings created by picking one character from each string of the array. The individual strings do not contain any duplicates. Ex: {ABC, DE...read more
Ans. 
Print all possible combinations of strings by picking one character from each string in the array.
• Iterate through each character of the first string and combine it with each character of the second string.

• Repeat the process for all strings in the array to get all possible combinations.

• Use nested loops to generate combinations efficiently.
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Q2. Given an array of size n, print the indices , i which have an equilibrium point around them defined as sum of i-p to i-1 elements = sum of i to t+p-1 elements (equal sum on left side and right side of the ...read more
Ans. 
Find indices in an array where the sum of elements around them is equal.
• Equilibrium point is defined as sum of elements before index i equals sum of elements from index i to t+p-1.

• Example: For P=2 and Array={1,-1,3,-3,10,-10,17}, indices 2, 4, and 5 are equilibrium points.

• At index 2: Left sum (1 + -1) = 0, Right sum (3) = 3; not an equilibrium.

• At index 4: Left sum (1 + -1 + 3 + -3) = 0, Right sum (10 + -10) = 0; equili...read more
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Q1. Check if given string has Balanced Parentheses.
Ans. 
Check if a string has balanced parentheses.
• Use a stack to keep track of opening parentheses.

• Iterate through the string and push opening parentheses onto the stack.

• When a closing parenthesis is encountered, pop from the stack and check if it matches the closing parenthesis.

• If stack is empty at the end and all parentheses are matched, the string has balanced parentheses.
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Q2. Modified Balanced Parentheses where a character can be matched with any other character, i.e. / with &, ! with ? and so on.
Ans. 
Modified Balanced Parentheses where characters can be matched with any other character.
• Use a stack to keep track of opening characters

• When encountering a closing character, check if it matches the top of the stack

• If it matches, pop from the stack, else return false

• Continue until end of string, return true if stack is empty
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Q3. Very similar to print the spiral order traversal of a matrix
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Traverse a matrix in spiral order, collecting elements layer by layer.
• Start from the top-left corner and move right until the end of the row.

• Then, move down the last column.

• Next, move left across the bottom row.

• Finally, move up the first column.

• Repeat the process for the inner layers until all elements are traversed.

• Example: For a matrix [[1,2,3],[4,5,6],[7,8,9]], the spiral order is [1,2,3,6,9,8,7,4,5].
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Q1. Given a date in string format, write a java program to return the date n days after the given date. Solve the question without using DateTimeFormatter or any similar Date parsing libraries.
Ans. 
Java program to calculate date n days after given date without using Date parsing libraries.
• Parse the input date string to extract day, month, and year components.

• Calculate the total number of days represented by the input date.

• Add the specified number of days to the total days calculated.

• Convert the final total days back to day, month, and year components to get the new date.
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Q1. Java OOP questions: Function overloading and overriding, use of static function, difference between final, finally and finalize keywords.
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Q2. Print all Pythagorean triplets within a given range.
Ans. 
Print Pythagorean triplets within a given range.
• Iterate through all possible combinations of a, b, and c within the given range

• Check if a^2 + b^2 = c^2 for each combination

• Print the triplets that satisfy the Pythagorean theorem
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Q3. Print all combinations of numbers in an array which sum up to a number k. Ex : Arr={3,1,4,5} k=5 Ans : {{1,4},{5}}
Ans. 
Use backtracking to find all combinations of numbers in an array that sum up to a given number.
• Start by sorting the array in non-decreasing order to easily identify combinations.

• Use backtracking to recursively find all combinations that sum up to the target number.

• Keep track of the current combination and the remaining sum as you traverse the array.

• Add the current combination to the result when the sum equals the targe...read more
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Q4. Standard behavioural questions: Why Oracle? Where do you see yourself in 5 years? Your strengths and weaknesses.
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1 DP Question, 1 Rest API, 10 Aptitude MCQs, 10 English MCQs

Q1. Linked list based include cycle detection and bottom pointer,DBMS
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