Sumithra questions

• Wrapper class in java [closed]
• Upcasting and Downcasting in java
• web.xml for jstl
• Array even & odd sorting
• flush() java file handling
• character checking
• Boxing and Widening
• Hashmap implementation to count the occurrences of each character
• Usage of inner class
• List vs Queue vs Set of collections in Java

Sumithra answers