This is the first set of Java questions for SDET and Automation testing, will post more posts in following weeks so stay tuned and do subscribe for future posts.

Top Interview question on Automation testing- Selenium:

Automation Testing(java)-Set-05

41. What is Eager and Lazy Initialization of Singleton Class ?

Ans: Check Link for Answer

42. What modifiers are accepted for Main class in Java?

Ans: public, abstract & final are permitted

43. Write code to reverse a string without using function?

Ans:

public class reverse {
    public static void main (String args[]) {

            String str = "automationreinvented";
            int n = str.length();
            String rev="";
            for (int i=n-1;i>=0;i--)
             rev = rev + str.charAt(i);
            System.out.println(rev);

        }
    }

44. How to do string manipulation in java?

Ans: Check for answer

45. Write a Java function which will return the maximum number in array?

Ans:

static int max()
    {
    int i;
    int max = findmaximum[0];
    for (i=1;i<findmaximum.length;i++)

        if (findmaximum[i] > max)
            max = findmaximum[i];

        return max;
    }

46. How to sort an Array using function?

Ans:

public class sortIntegerArray {

        public static void main(String[] args) {
            int[] arr={2,9,3,5,4,7,1,8,6};
            int temp;
            Arrays.sort(arr);
            for(int i=0;i<arr.length;i++)
            {
                System.out.println(arr[i]);
            }

        }
    }

47. How to Add/Join/Combine two arraylist?

Ans: Check link for answer

48. How to convert List to array and array to list?

Ans: To convert List to Array: list.toArray();

To convert Array to List: Arrays.asList(Array);

49. How to get length of Array and List?

Length of array: array.length();

Size of list: list.size();

50. Difference between comparable and comparator in Java?

Ans: Check Link for Answer

51. How to call a method in Java with and without object?

Ans: Click link for answer