Java程序以扩展Integer数组的大小
让我们首先创建一个Integer数组-
Integer[] arr = new Integer[] { 50, 100, 150, 200, 400, 500, 800, 1000};现在，创建一个扩展大小的新数组-
Integer[] new_size = new Integer[15];
添加元素以扩展尺寸-
new_size[8] = 2000; new_size[9] = 3000; new_size[10] = 4000; new_size[11] = 5000; new_size[12] = 6000; new_size[13] = 9000; new_size[14] = 10000;
现在，复制该数组并形成扩展大小的最终数组-
System.arraycopy(arr, 0, new_size, 0, arr.length);
示例
public class Demo {
public static void main(String[] args) {
Integer[] arr = new Integer[] { 50, 100, 150, 200, 400, 500, 800, 1000};
System.out.println("All the elements before extending the array...");
for (Integer i:arr)
System.out.println(i);
Integer[] new_size = new Integer[15];
new_size[8] = 2000;
new_size[9] = 3000;
new_size[10] = 4000;
new_size[11] = 5000;
new_size[12] = 6000;
new_size[13] = 9000;
new_size[14] = 10000;
System.arraycopy(arr, 0, new_size, 0, arr.length);
System.out.println("All the elements after extending the array...");
for (Integer i: new_size)
System.out.println(i);
}
}输出结果
All the elements before extending the array... 50 100 150 200 400 500 800 1000 All the elements after extending the array... 50 100 150 200 400 500 800 1000 2000 3000 4000 5000 6000 9000 10000