在Java 8中使用Streams代替for循环 [英] Using Streams instead of for loop in java 8

问题描述

int [] numbers = {1,2,3,4,5,6,7,8};
int [] doubleNumbers = new int[numbers.length];
int [] tripleNumbers = new int[numbers.length];


for(int index = 0; index < numbers.length; index++)
{
    doubleNumbers[index] = numbers[index] * 2;  
    tripleNumbers[index] = numbers[index] * 3;
}

System.out.println("Double Numbers");
Arrays.stream(doubleNumbers).forEach(System.out::println);

System.out.println("Triple Numbers");
Arrays.stream(tripleNumbers).forEach(System.out::println);

我在上面的代码中使用了循环，并将数字加倍和增加了三倍，并将其存储在单循环中的不同数组中.有人可以帮我使用流及其映射和其他方法编写相同的代码，而无需两次迭代数字数组.

I have above code where I have used for loop and double and triple the numbers and stored it in different arrays in single loop. Can anybody help me to write the same code using streams with its map and other methods without iterating numbers array twice.

推荐答案

您可以这样做:

IntStream.range(0, numbers.length)
  .forEach(index -> {
    doubleNumbers[index] = numbers[index] * 2;
    tripleNumbers[index] = numbers[index] * 3;
  });

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