Java循环问题

Question

Object[] objs = new Object[5];
for (int i = 0; i < 5; ++i) {
    int j = i + 1;
    Object obj = objs[i];
}

我对上面的循环有两个问题:

1. j 变量和 obj 引用是为每次循环迭代创建的，还是只创建一次，然后才重新分配值？
2. 将 ++i 而不是 i++ 作为单个指令来增加值是否有任何性能优势？

Answer 1

Are the j variable and obj reference created for every loop iteration or they are created once and then only reassigned the values?

每次声明和创建

Is there any perfomance benefit of putting ++i instead of i++ as a single instruction to increment the value?

不是真的。