Practical Slip 10 - 2019 Pattern

Core Java:

A) Write a java program to count the frequency of each character in a given string.  [15 M]

B) Write a java program for the following:  [25 M]

Python:

A) Write Python GUI program to display an alert message when a button is pressed.  [15 M]

B) Write a Python class to find validity of a string of parentheses, '(', ')', '{', '}', '[' ']’. These brackets must be close in the correct order. for example "()" and "()[]{}" are valid but "[)", "({[)]" and "{{{" are invalid.  [25 M]