オブジェクト 配列
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オブジェクト 配列
コード public class ObjArrary { public static void main(String[] args) { System.out.println("Start"); // System.out.println("------------------------"); // String strArrary[] = new String[3]; System.out.println("strArrary.length -> " + strArrary.length); strArrary[0] = "0"; strArrary[2] = "22"; System.out.println("strArrary[0] -> " + strArrary[0]); System.out.println("strArrary[1] -> " + strArrary[1]); //NULL System.out.println("strArrary[2] -> " + strArrary[2]); System.out.println("strArrary[0].length() -> " + strArrary[0].length()); System.out.println("strArrary[2].length() -> " + strArrary[2].length()); //NULL ERROR System.out.println("strArrary[1].length() -> " + strArrary[1].length()); // System.out.println("------------------------"); System.out.println("End"); } }
結果 Start ------------------------ strArrary.length -> 3 strArrary[0] -> 0 strArrary[1] -> null strArrary[2] -> 22 strArrary[0].length() -> 1 strArrary[2].length() -> 2 java.lang.NullPointerException at ObjArrary.main(ObjArrary.java:44) Exception in thread "main"
