如何将Map.put拆分为2（先放一个键，后放一个值）？

Question

Map <String, String> contactsList = new HashMap<>();
 public String putInContactsNameNumber(String name, String number){
    contactsList.put(name, number);
    return number + name;
}

（坐在类名联系人里面。）
之后在主类中得到：

Scanner scanner = new Scanner(System.in)
Contacts contacts = new Contacts();
contacts.contactsList.put("name1","1234");
contacts.contactsList.put("nmae2","2345");

想让用户插入一个新的键和值，所以添加了以下内容：

String lastName;
String lastNumber;
System.out.println("Enter a name and a phone number");
contacts.putInContactsNameNumber(lastName = scanner.next() ,lastNumber = scanner.next());
System.out.println("Contact is been added.");
System.out.println("name: " + lastName + "\nNumber: " + lastNumber);

contacts.putInContactsNameNumber(lastName = scanner.next() ,lastNumber = scanner.next());

谢谢你的帮助：）

Answer 1

您可以简单地将语句拆分为多个较小的语句。你不必在一条线上做这件事。

System.out.println("Enter a name:");
String lastName = scanner.nextLine();

System.out.println("Enter a phone number:");
String lastNumber = scanner.nextLine();

contacts.putInContactsNameNumber(lastName, lastNumber);
System.out.println("Contact has been added.");
System.out.println("name: " + lastName + "\nNumber: " + lastNumber);