如何获得部分Java用户输入？

Question

我想制作一个Java程序来接受用户输入的一部分并将其存储起来，以便以后使用。我的输入看起来像这样：

Mary market 8 theatre 80 end
John books 45 end 

第一个字段表示该人的姓名，然后按照他们给钱的原因名称跟随一系列费用。单词end表示每个人输入的结尾。

我的问题是如何区分人民的名字和他们的支出，以便可以输出每个人的支出平均数？

Answer 1

这确实取决于您是否严格同意输入数据将始终与示例中的格式相同，然后您可以简单地使用字符串.split(" ")并读取每一行的所有数字。

示例：

// or any other input, eg: List, BufferedReader, etc
String[] lines = new String[] {
        "Mary market 8 theatre 80 end",
        "John books 45 end"
};
for (String line : lines) {
    String[] raw = line.split(" ");
    String name = raw[0];

    for (int i = 1; i < raw.length; i += 2) {
        if (raw[i].equals("end")) break;
        String expenseName = raw[i];
        int cost = Integer.parseInt(raw[i+1]); 
        ... 
    }
}

但是如果没有，那么使用RegExp并找到每一行中的所有数字可能更好。

示例：

// or any other input, eg: List, BufferedReader, etc
String[] lines = new String[] {
        "Mary market 8 theatre 80 end",
        "John books 45 end"
};

Pattern p = Pattern.compile("\\d+");
for (String line : lines) {
    Matcher m = p.matcher(line);
    while(m.find()) {
        int cost = Integer.parseInt(m.group());
        ...
    }
}

Answer 2

万一用户按照您的指示输入输入：使用split()字符串方法主班

public class Main {

public static void main(String[] args) {
    Scanner s = new Scanner(System.in);

    //Get Input
    String input = s.nextLine();

    //Split using Whitespace Regex (Or any regex if you want)
    String[] InputArray = input.split(" ");

    //Object to get person info later
    PersonExpense person = new PersonExpense(InputArray[0]);

    //Loop throw the array to get data
    for (int i = 1; i < InputArray.length ; i = i+2) {
        if (InputArray[i].toLowerCase().equals("end"))
            break;
        else{
               person.addExpenses(new Pair<>(InputArray[i],Integer.valueOf(InputArray[i+1])));
        }
    }

}
}

PersonExpense类别

public class PersonExpense {

private String PersonName;

//ArrayList of pairs to save the name and cost of the expense
private ArrayList<Pair <String,Integer> > expenses = new ArrayList <Pair <String,Integer> > ();

public PersonExpense(String personName) {
    PersonName = personName;
}

public void addExpenses(Pair<String, Integer> expense) {
    this.expenses.add(expense);
}

public ArrayList<Pair<String, Integer>> getExpenses() {
    return expenses;
}

public void setExpenses(ArrayList<Pair<String, Integer>> expenses) {
    this.expenses = expenses;
}

public String getPersonName() {
    return PersonName;
}

public void setPersonName(String personName) {
    PersonName = personName;
}
}