Day: April 22, 2024
17 posts
12章13
このJavaコードは、switchステートメントを使って文字列strの値に基づいて異なる操作をすることを意図しています。しかし、strが初期化されていないため、その値はnullです。switchステートメントはnull値を扱うことができないため、実行時にNullPointerExceptionが発生します。それを踏まえて、コードにコメントを追加して説明します。コメントを追加するには、行に対して直接説明を書きます。以下がその例です: public class Sample { // strはクラスレベルの変数で初期値はnull static String str; public static void main(String[] args) { // switch文にはstrが渡されるが、strはnullなのでNullPointerExceptionが投げられる…
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