Java数组拷贝

public class Test {
  public static void main(String[] args) {
    int[] arr1 = {10, 20, 30};
    int[] arr2 = new int[arr1.length];
    for (int i = 0; i < arr1.length; i++) {
      arr2[i] = arr1[i];
    }
    arr2[0] = 100;
    System.out.println("arr1:");
    for (int i = 0; i < arr1.length; i++) {
      System.out.println(arr1[i]);
    }
    // 10 
    // 20
    // 30
    System.out.println("arr2:");
    for(int i = 0; i < arr2.length; i ++) {
      System.out.println(arr2[i]);
    }
    // 100
    // 20
    // 30
  }
}