Core Java perguntas e respostas de entrevista
Question: Explain the usage of Java packages.Answer: This is a way to organize files when a project consists of multiple modules. It also helps resolve naming conflicts when different packages have classes with the same names. Packages access level also allows you to protect data from being used by the non-authorized classes.e.g. java.lang basic language functionality and fundamental types java.util collection data structure classes java.io file operations java.math multiprecision arithmetics java.nio the New I/O framework for Java java.net networking operations, sockets, DNS lookups java.security key generation, encryption and decryption java.sql Java Database Connectivity (JDBC) to access databases java.awt basic hierarchy of packages for native GUI components javax.swing hierarchy of packages for platform-independent rich GUI components java.applet classes for creating an applet |
Salvar para revisao
Adicione este item aos favoritos, marque-o como dificil ou coloque-o em um conjunto de revisao.
Faca login para salvar favoritos, perguntas dificeis e conjuntos de revisao.
Isto e util? Sim Nao
Mais uteis segundo os usuarios:
- How could Java classes direct program messages to the system console, but error messages, say to a file?
- What are the differences between an interface and an abstract class?
- Why would you use a synchronized block vs. synchronized method?
- How can you force garbage collection?
- What are the differences between the methods sleep() and wait()?