打印出数组中的元素，除了最后一个单词之外的元素之间用逗号分隔

问题描述

我正在打印数组列表中的元素，并且希望在除最后一个单词之外的每个单词之间使用逗号.现在我正在这样做:

I am printing out elements from an array list and want to have a comma between each word except the last word. Right now I am doing it like this:

for (String s : arrayListWords) {
    System.out.print(s + ", ");
}

如你所见，它会打印出这样的单词:one,2,3,4, 而问题是最后一个逗号，我该如何解决?感谢所有答案！

As you understand it will print out the words like this: one, two, three, four, and the problem is the last comma, how do I solve this? All answers appreciated!

推荐答案

如果第一个单词存在，则单独打印.然后先将模式打印为逗号，然后是下一个元素.

Print the first word on its own if it exists. Then print the pattern as comma first, then the next element.

if (arrayListWords.length >= 1) {
    System.out.print(arrayListWords[0]);
}

// note that i starts at 1, since we already printed the element at index 0
for (int i = 1; i < arrayListWords.length, i++) { 
     System.out.print(", " + arrayListWords[i]);
}

使用 List，最好使用 Iterator

// assume String
Iterator<String> it = arrayListWords.iterator();
if (it.hasNext()) {
    System.out.print(it.next());
}
while (it.hasNext()) {
    System.out.print(", " + it.next());
}

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