将字符串数字字转换为字符串数字：Java

Question

我是一名初级程序员，正在尝试使用单词转换器，它应该是这样工作的：Input=“零；六；八；二”Output=“0682”。但在我的例子中，我得到的输出是“0282”。有什么解决办法吗？或者我应该换个程序？。我发现LinkedList或HashMap可以工作，如果可以的话，你能告诉我怎么做吗

Scanner scanner = new Scanner(System.in);
    String number = scanner.next();
            while (true) {
                String num = "";
                if(number.contains("zero"))
                    num = num + "0";
    
                if (number.contains("one"))
                    num = num + "1";
    
                if (number.contains("two"))
                    num = num +"2";
    
                if (number.contains("three"))
                    num = num + "3";
    
                if(number.contains("four"))
                    num = num + "4";
    
                if(number.contains("five"))
                    num = num + "5";
    
                if(number.contains("six"))
                    num = num + "6";
    
                if(number.contains("seven"))
                    num = num + "7";
    
                if(number.contains("eight"))
                    num = num + "8";
    
    
                System.out.println(number);
                System.out.println(num);
                break;
    
            }

Answer 1

在这里，我更喜欢使用HashMap。首先，您可以将数字映射初始化为文本，将数字映射为int；就像

private static Map<String, Integer> digitDict = new HashMap<>();
static {
    digitDict.put("zero", 0);
    digitDict.put("one", 1);
    digitDict.put("two", 2);
    digitDict.put("three", 3);
    digitDict.put("four", 4);
    digitDict.put("five", 5);
    digitDict.put("six", 6);
    digitDict.put("seven", 7);
    digitDict.put("eight", 8);
    digitDict.put("nine", 9);
}

那么你的main方法只需要参考这个Map。但是，我也建议你在循环中阅读输入。将行转换为小写（以简化事情）。并提供终止循环的机制。比如

while (scanner.hasNextLine()) {
    String line = scanner.nextLine().toLowerCase();
    if (line.equals("quit")) {
        break;
    }
    String[] tokens = line.split(";");
    StringBuilder sb = new StringBuilder();
    for (String token : tokens) {
        sb.append(digitDict.getOrDefault(token, -1));
    }
    System.out.println(sb);
}

Answer 2

您应该在;上拆分分号分隔的输入，然后在循环中迭代每个术语：

Scanner scanner = new Scanner(System.in);
String input = scanner.next();
String[] nums = input.split(";");
String num = "";

for (String number : nums) {
    if ("zero".equals(number))
        num = num + "0";
    else if ("one".equals(number))
        num = num + "1";
    else if ("two".equals(number))
        num = num + "2";
    else if ("three".equals(number))
        num = num + "3";
    else if ("four".equals(number))
        num = num + "4";
    else if ("five".equals(number))
        num = num + "5";
    else if ("six".equals(number))
        num = num + "6";
    else if ("seven".equals(number))
        num = num + "7";
    else if ("eight".equals(number))
        num = num + "8";
    else if ("nine".equals(number))
        num = num + "9";
}

System.out.println("input:  " + input);
System.out.println("output: " + num);

对于zero;six;eight;two的输入，这是上述脚本的输出：

input:  zero;six;eight;two
output: 0682