问题出在getName()
方法中
public class Phonebook implements PhonebookInterface {
private Map<String, Set<String>> phonebook;
private Map<String, Address> address;
public Phonebook() {
this.phonebook = new HashMap<String, Set<String>>();
this.address = new HashMap<String, Address>();
}
@Override
public void addNumber(String person, String number) {
if (!this.phonebook.containsKey(person)) {
this.phonebook.put(person, new HashSet<String>());
}
this.phonebook.get(person).add(number);
}
@Override
public void getName(String number) {
for (String person : this.phonebook.keySet()) {
if (this.phonebook.get(person).contains(number)) {
System.out.println(" " + person);
} else {
System.out.println(" not found");
}
}
}
@Override
public void getNumber(String person) {
try {
for (String n : this.phonebook.get(person)) {
if (this.phonebook.get(person).size() > 1) {
System.out.println(" " + n);
} else {
System.out.println("number: " + n);
}
}
} catch (Exception e) {
System.out.println(" not found");
}
}
public void addAddress(String person, String street, String city) {
this.address.put(person, new Address(street, city));
}
public void getInfo(String person) {
if (this.address.containsKey(person)) {
System.out.println(" address: " + this.address.get(person));
if (this.phonebook.containsKey(person)) {
System.out.println(" phone numbers:");
for (String n : this.phonebook.get(person)) {
System.out.println(" " + n);
}
} else {
System.out.println(" phone number not found");
}
} else {
System.out.println(" not found");
}
}
public void removeInfo(String person) {
if (this.address.containsKey(person)) {
this.address.remove(person);
} else {
System.out.println(" not found");
}
}
}
public class Address {
private String street;
private String city;
public Address() {
}
Address(String street, String city) {
this.street = street;
this.city = city;
}
public String getStreet() {
return this.street;
}
public String getCity() {
return this.city;
}
public String toString() {
return this.street + " " + this.city;
}
}
class Main {
public static void main(String[] args) {
Phonebook p = new Phonebook();
System.out.println("Search for number: ");
System.out.println("Pekka :");
p.addNumber("Pekka", "014-1234");
p.addNumber("Pekka", "015-5344");
p.getNumber("Pekka");
System.out.println("Matti :");
p.addNumber("Matti", "013-4321");
p.getNumber("Matti");
System.out.println("\nsearch for a person by phone number: ");
p.getName("013-4321");
p.getName("1234567");
}
}
搜索号码: 佩卡: 014-1234 015-5344 马蒂: 编号:013-4321
通过电话号码搜索某人: 马蒂 未找到
搜索号码: 佩卡: 014-1234 015-5344 马蒂: 编号:013-4321
按电话号码搜索某人: 未找到 马蒂 未找到 未找到
为什么输出打印“未找到”3次而不是一次?
迭代Map
的所有键,并将相应的值与您要查找的值进行比较。如果没有匹配项,则打印“未找到”。
你的Map
有两个键,所以如果你在Map
中搜索一个值,你将打印匹配的键,但你也会打印另一个键的“not found”。
如果您要搜索Map
中不存在的值,则会打印“未找到”两次(每个键一次)。
迭代所有键后,您应该只打印“未找到”:
public void getName(String number) {
for (String person : this.phonebook.keySet()) {
if (this.phonebook.get(person).contains(number)) {
System.out.println(" " + person);
return;
}
}
System.out.println(" not found");
}