All in one solution to learn. The best app for Java Programming Problem s and solution. There are nice UI in this app. Code style of this apps is familier. Features. Totally Offline. 48 problems and Solution. Very Simple UI & UX. Problems and solution. 1. Hello World. 2. Addition. 3. Divisor. 4. Small to Large. 5. Leap Year. 6. Cricket Run Rate. 7. Largest Number.