关于JAVA复制的问题

package test02;

public class ArraysOfPrimitives {
    
    public static void main(String[] args) {
        int [] a1 = {1, 2, 3, 4, 5};
        int [] a2;
        
        a2 = a1;   //引用
        
        for (int i = 0; i < a2.length; i++) {
            a2[i] = a2[i] + 10;                  //改变a2的值
        }
        
        for (int i = 0; i < a1.length; i++) {
            System.out.println("a[" + i + "] = " + a1[i]);    
        }
    }
}