Mphasis Sr Test Engineer interview questions

1) How do you handle frames 2) How do you mouse hover over an element 3) Which is the fastest webdriver 4) What happens if you write a constructor in interface 5) Write a program to remove array duplicates with out using collections 6) Write String Palindrome program 7) How do you connect to database using java 8) How do you execute jars using command prompt 9) How do you set priority in testNG