Category solved model papers

Differentiate between String, StringBuffer, and StringBuilder classes with focus on mutability, performance, and thread safety. Answer:- Here is a clear and concise comparison between String, StringBuffer, and StringBuilder in Java…

Describe all the string comparison methods available in java with examples. Answer:- String Comparison Methods in Java Java provides several methods to compare String values. These methods can compare based…

Describe the concept of Spliterators in Java. Enumerate the key methods provided by the Spliterator interface. Illustrate the usage of Spliterators with a suitable example. Answer:- Spliterator in Java A…

What are legacy classes? Explain any four legacy classes of java’s collection framework with suitable programs. Answer:- Legacy Classes in Java Collection Framework Legacy classes are the original classes provided…

Discuss the various methods provided by the Array class in Java. Illustrate the usage of these methods with a suitable example program. Answer:- Arrays Class in Java The Arrays class…

Define a Comparator. Mention the methods provided by the Comparator interface. Illustrate its use with a program that demonstrates sorting elements in a TreeSet in reverse order. Answer:- Comparator Interface…

Definition of DAO (Decentralized Autonomous Organization) A DAO is a Decentralized Autonomous Organization, meaning an organization run entirely using code (smart contracts) on a blockchain — with no central leadership.…

Definition of Oracle An Oracle is a trusted third-party service that provides external (off-chain) data to smart contracts on the blockchain.Since smart contracts cannot access real-world data on their own,…

Smart Contracts on a Blockchain ✅ Definition A smart contract is a self-executing program stored on a blockchain that automatically enforces rules and conditions without requiring a third party. Once…