Java SE 17 Developer 試験対策問題集

模擬試験モードの設定

上記は本サイトの模擬試験モードの設定値です。実際の試験の出題数・制限時間・合格基準は、各認定プログラムの公式サイトでご確認ください。

出題分野

• Values, Text, Date-Time and Localization（値・文字列・日時・地域化）（出題比率 12%）
• Controlling Program Flow and Handling Exceptions（流れの制御と例外）（出題比率 8%）
• Utilizing Java Object-Oriented Approach（オブジェクト指向の活用）（出題比率 24%）
• Arrays, Collections, Streams and Lambdas（コレクションとストリーム）（出題比率 12%）
• Packaging and Deploying Java Code（配備とモジュールシステム）（出題比率 8%）
• Managing Concurrent Code Execution（並行実行の管理）（出題比率 12%）
• Using Java I/O API and Accessing Databases（入出力と JDBC）（出題比率 12%）
• Logging, Annotations and Generics（ロギング・注釈・ジェネリクス）（出題比率 12%）

フリー問題

1. A summary screen needs the whole number that is nearest to a double value, and t…
2. A developer assigns text that has one leading and one trailing space to a String…
3. A reporting method computes a percentage with the single line int percent = coun…
4. A method has a try block that raises an IllegalStateException, a catch block for…
5. A method turns an enum value into a display label. The team wants compilation to…
6. A class contains a static initializer block, an instance initializer block, and …
7. A class named Outer contains a static nested class named Inner. How does code in…
8. A record is declared inside an interface so that the two live together. What is …
9. An enum declares one field, a constructor that takes a single argument, and a ge…
10. An interface declares a default method, and a class implements that interface wi…
11. A pipeline calls stream on a list, then filter, then map, and the method returns…
12. A method declares an array of five String values and an array of five boolean va…
13. A library wants one of its packages to be readable by two companion modules whil…
14. Code in module alpha uses a public class from the package beta.api, and that pac…
15. Tasks that a pool runs sometimes raise a RuntimeException, and nothing about tho…
16. A task has to compute a value, hand that value back to the code that started it,…
17. A class implements the marker interface for serialization, and one of its fields…
18. A method opens a database connection, runs one query, and walks through the rows…
19. A detailed message is assembled by joining several values, and in production the…
20. A subclass declares a method that is meant to replace the behavior of one in its…