Core Java 面接の質問と回答
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 |
復習用に保存
この項目をブックマークに追加したり、難しい内容としてマークしたり、復習セットに入れたりできます。
役に立ちましたか？ はい いいえ
ユーザー評価で最も役立つ内容:
- 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()?