练习题1：Java引用对象指向练习

求代码最终的输出结果：str、a、p、array

 public class Test {
     public static void main(String[] args) {
         String str = "hello";
         Integer a = 1;
         Point p = new Point(1,2);
         Point[] array = {
                 new Point(3,4),
                 new Point(5,6),
                 new Point(7,8)
         };
         test(str,a,p,array);
         System.out.println(str);
         System.out.println(a);
         System.out.println(p);
         System.out.println(Arrays.toString(array));
     }
     public static void test(String str,Integer a,Point p,Point[] array){
         str = str.substring(1);
         a++;
         a=20;
         p.setX(2);
         array[0].setX(a);
         Point[] array2 = Arrays.copyOf(array, array.length+1);
         array2[array2.length-1]=p;
         array2[0].setX(5);
         array = array2;
         array[array2.length-1].setX(6);
         p = new Point(7,8);
     }
 }
 

输出结果：

　　hello
　　1
　　Point [x=6, y=2]
　　[Point [x=5, y=4], Point [x=5, y=6], Point [x=7, y=8]]

解答：