JAVA 赋值和运算符

Question

下面的代码打印出15 15，但我希望它打印出12 15。修复方法似乎正在更新 a1，使其包含 3,7,5，而不是 3,4,5。有谁知道为什么会这样吗？

class PassA 
{
    public static void main(String [] args) 
{
    PassA p = new PassA();
    p.start();
}

void start() 
{
    long [] a1 = {3,4,5};
    long [] a2 = fix(a1);
    System.out.print(a1[0] + a1[1] + a1[2] + " ");
    System.out.println(a2[0] + a2[1] + a2[2]);
}

long [] fix(long [] a3) 
{
    a3[1] = 7;
    return a3;
}
}

Answer 1

看看下面

 long[] fix(long[] a3) { // a3=a1 and a1= {3,4,5}
    a3[1] = 7; // a3[1]=7 means a1[1] will become 7(a1[1]=7), now a1={3,7,5}
    return a3;// return a1
}