Eidiko Systems Integrators Software Engineer Interview Questions, Process, and Tips

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-s

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.

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.

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"});

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