对于输出0，-1,1，-2,2，-3,3的循环

Question

我正在制作一个Java游戏，我正在尝试使用for循环来获取块在x轴上来回交替生成。

Answer 1

做这样的事情：

spawn(0);

for(int i = 1; i <= 3; ++i)
{
    spawn(-i);
    spawn( i);
}

Answer 2

Method createBlock(): //creates the blocks at desired x axis 

createBlock(0); //initial block placed at 0
int howMany= input
for (i=0; howMany;i++){
    createBlock(-i)
    createBlock(i)
}

Answer 3

IntStream.iterate(0, i -> i >= 0 ? -i - 1 : -i). limit(100).forEach(i -> System.out.println(i));

Answer 4

    System.out.print(0);
    for (int i = 1; i<=3; i++) {
        System.out.print(String.format(",%s,%s", -i, i));
    }