Java程序将数组的大小加倍
为了使数组的大小增加一倍，让我们首先创建一个数组-
int arr[] = {5, 10, 15, 20, 25, 30, 35, 40, 45, 50};现在，获取上述数组的长度-
int len = arr.length;
将上述数组的大小加倍-
intnewArray[] = new int[len*2];
现在，newArray[]的长度将是数组arr[]的两倍。
示例
public class Demo {
public static void main (String args[]) {
int arr[] = {5, 10, 15, 20, 25, 30, 35, 40, 45, 50};
System.out.println("Length of initial array = " + arr.length);
int len = arr.length;
int newArray[] = new int[len*2];
System.arraycopy(arr, 0, newArray, 0, len);
System.out.println("Length of new array = "+newArray.length);
}
}输出结果
Length of initial array = 10 Length of new array = 20
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