5 Essential Java Coding Interview Questions and Answers for Senior Developers (part-3)

Essential Java coding interview questions (part-3)

As a senior Java developer, you need to have a deep understanding of the language and be able to solve complex coding challenges. In this blog, we will look at five Java coding interview questions!

1. Write a Java program to reverse a string. (not so hard!)

public static String reverseString(String str) {
    StringBuilder sb = new StringBuilder(str);
    return sb.reverse().toString();
}

Explanation: The reverseString method takes a string as input, creates a StringBuilder object with the string, and then calls the reverse() method to reverse the characters in the string. Finally, it returns the reversed string.

2. Write a Java program to reverse a string without using the reverse() method.

This can be a follow up question to the first question.

public static String reverseString(String str) {
    char[] charArray = str.toCharArray();
    int start = 0;
    int end = charArray.length - 1;
    while (start < end) {
        char temp = charArray[start];
        charArray[start] = charArray[end];
        charArray[end] = temp;
        start++;
        end--;
    }
    return new String(charArray);
}