day05--数组的异常_索引越界异常的操作介绍(取值和赋值)

day05/src/com/inmind/array01/Demo02.java

@@ -0,0 +1,21 @@
+package com.inmind.array01;
+
+public class Demo02 {
+    public static void main(String[] args) {
+        //定义一个整数变量
+        int i = 10;
+        System.out.println(i);
+        //简写形式定义一个整数数组
+        int[] arr = {1, 2, 3};
+        int[] arr1 = {4, 5, 6};
+        System.out.println(arr[1]);
+        System.out.println(arr1[2]);
+
+        System.out.println(arr);
+        System.out.println(arr1);
+
+        arr = arr1;
+        System.out.println(arr);
+        System.out.println(arr1);
+    }
+}

day05/src/com/inmind/array01/Demo03.java

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+package com.inmind.array01;
+
+/**
+ * ArrayIndexOutOfBoundsException
+ * 数组索引越界异常
+ * 注意：数组的长度固定不变的，数组的最大的索引值为arr.length-1
+ * 0~(arr.length-1)
+ */
+public class Demo03 {
+    public static void main(String[] args) {
+        int[] arr = {1, 2, 3};
+        System.out.println(arr[0]);
+        System.out.println(arr[1]);
+        System.out.println(arr[2]);
+        //如果使用错误的索引访问数组的数据，那就会报越界异常java.lang.ArrayIndexOutOfBoundsException
+        //System.out.println(arr[3]);
+        int index = 2;
+        if (index > 0 && index < arr.length) {
+            System.out.println(arr[index]);
+        }
+
+        System.out.println("程序正常结束");
+    }
+}