Arrays.deepToString() 方法同时适用于基元数组和对象数组：

import java.util.*;public class MultiDimWrapperArray {public static void main(String[] args) {Integer[][] a1 = { // Autoboxing{ 1, 2, 3, },{ 4, 5, 6, },};Double[][][] a2 = { // Autoboxing{ { 1.1, 2.2 }, { 3.3, 4.4 } },{ { 5.5, 6.6 }, { 7.7, 8.8 } },{ { 9.9, 1.2 }, { 2.3, 3.4 } },};String[][] a3 = {{ "The", "Quick", "Sly", "Fox" },{ "Jumped", "Over" },{ "The", "Lazy", "Brown", "Dog", "&", "friend" },};System.out.println("a1: " + Arrays.deepToString(a1));System.out.println("a2: " + Arrays.deepToString(a2));System.out.println("a3: " + Arrays.deepToString(a3));}
}
/* Output:
a1: [[1, 2, 3], [4, 5, 6]]
a2: [[[1.1, 2.2], [3.3, 4.4]], [[5.5, 6.6], [7.7,
8.8]], [[9.9, 1.2], [2.3, 3.4]]]
a3: [[The, Quick, Sly, Fox], [Jumped, Over], [The,
Lazy, Brown, Dog, &, friend]]
*/

同样的，在 Integer 和 Double 数组中，自动装箱可为你创建包装器对象。