使用 Arrays.copyOf 进行数组复制

import java.util.Arrays;
 
public class ArrayCopy {
  public static void main(String args[]) {
    System.out.printf("Before (original)\t%s%n", Arrays.toString(args));
    String copy[] = Arrays.copyOf(args, 4);
    System.out.printf("Before (copy)\t\t%s%n", Arrays.toString(copy));
    copy[0] = "A";
    copy[1] = "B";
    copy[2] = "C";
    copy[3] = "D";
    System.out.printf("After (original)\t%s%n", Arrays.toString(args));
    System.out.printf("After (copy)\t\t%s%n", Arrays.toString(copy));
  }
}