在输入中取第二个字

Question

我正在尝试制作一个计算器来帮助我完成物理作业。为此，我试图将它分成两个部分，因此键入＆＃34;波长18＆＃34;将它分成波长＆＃34;和＆＃34; 18＆＃34;作为数值。

我理解能得到第一个可以使用的词

   String variable = input.next();

但有没有办法阅读太空后的内容？

感谢。

Answer 1

String[] parts = variable.split(" ");
string first = parts[0];
string second = parts[1];

Answer 2

String entireLine = input.nextLine();
String [] splitEntireLine = entireLine.split(" ");
String secondString = splitEntireLine[1];

Answer 3

Assuming that you also might have three words or just one, it is better not to rely on arrays. So, I suggest to use List here:

final String inputData = input.next();
//Allows to split input by white space regardless whether you have
//"first   second" or "first second"
final Pattern whiteSpacePattern = Pattern.compile("\\s+");
final List<String> currentLine = whiteSpacePattern.splitAsStream(inputData)
.collect(Collectors.toList());

Then you can do a variety of checks to ensure you have correct number of values in the list and get your data:

//for example, only two args
if(currentLine.size() > 1){
   //do get(index) on your currentLine list
 }