1.What is constraints and it's types? 2.what is meant by wrapper class? 3.What is meant by string buffer? 4.Write a program to print number of count of characters in a string and remove duplicates by giving user input.

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This interview includes questions related to constraints, wrapper class, string buffer, and programming.

Constraints are rules that limit the values or types of data that can be entered into a field or table. There are two types of constraints: column-level and table-level constraints.
Wrapper classes are classes that encapsulate primitive data types and provide methods to manipulate them. For example, Integer is a wrapper class for the int primitive data type.
StringBuffer is a class that provides methods to modify and manipulate strings. It is similar to the String class, but it is mutable.
To print the count of characters in a string and remove duplicates, we can use a HashMap to store the count of each character and then iterate through the HashMap to print the count and remove duplicates.

1.What is constraints and it's types? 2.what is meant by wrapper class? 3.What is meant by string buffer? 4.Write a program to print number of count of characters in a string and remove duplicates by giving user input.

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