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Eidiko Systems Integrators Interview Questions and Answers

Updated 4 Jun 2024

Q1. Can we pass arguments in place of args... In string [] args .

Ans.

Yes, we can pass arguments in place of args in string[] args.

  • Arguments can be passed directly as an array of strings.

  • The number of arguments passed must match the size of the array.

  • Example: public static void main(String[] args) can be called as main(new String[] {"arg1", "arg2"});

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Q2. 1)What is python 2)what is an areay 3)two basic coding question

Ans.

Python is a high-level, interpreted programming language known for its simplicity and ease of use.

  • Python is used for web development, data analysis, artificial intelligence, and more.

  • An array is a collection of elements of the same data type, accessed using an index.

  • Two basic coding questions could be finding the sum of two numbers or reversing a string.

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Q3. Reverse the given string without using loop.

Ans.

The given string can be reversed using recursion.

  • Use a recursive function to reverse the string.

  • The base case of the recursion would be an empty string.

  • In each recursive call, remove the first character of the string and append it to the reversed substring.

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Q4. Difference between stringBuilder and stringbuffer?

Ans.

stringBuilder and stringBuffer are both used to manipulate strings, but stringBuilder is faster and not thread-safe while stringBuffer is slower and thread-safe.

  • Both classes are used to manipulate strings.

  • stringBuilder is faster than stringBuffer.

  • stringBuffer is thread-safe while stringBuilder is not.

  • Use stringBuilder when you don't need thread-safety and performance is important.

  • Use stringBuffer when you need thread-safety.

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Q5. String are immutable?

Ans.

Yes, strings are immutable in most programming languages.

  • Immutable means that once a string is created, it cannot be modified.

  • Any operation that appears to modify a string actually creates a new string.

  • This can lead to performance issues when working with large strings or in loops.

  • Examples of languages with immutable strings include Java, Python, and Ruby.

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Q6. Program based on substring

Ans.

A program that searches for a substring in an array of strings.

  • Create a function that takes an array of strings and a substring as parameters

  • Loop through the array and check if the substring is present in each string

  • Return an array of strings that contain the substring

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Q7. What is constructor?

Ans.

Constructor is a special method that is used to initialize objects in Java.

  • Constructors have the same name as the class they belong to.

  • They are called automatically when an object is created.

  • They can be overloaded to accept different parameters.

  • They do not have a return type.

  • Example: public class Car { public Car() { // constructor code here } }

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Q8. 2 largest number in array

Ans.

Find the 2 largest numbers in an array of strings.

  • Convert the strings to integers before comparing.

  • Use a sorting algorithm to sort the array in descending order.

  • Retrieve the first two elements in the sorted array.

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