For循环输出0，-1,1，-2,2，-3,3

Question

我在做一个Java游戏，我试图让块产卵使用for循环交替来回x轴。

Answer 1

就做这样的事情：

spawn(0); 

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

Answer 2

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

Answer 3

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 4

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