通过id方法搜索:
public class ClientsDetailsList {
public ArrayList <ClientDetails> aListOfClientDetails;
public ClientDetails getClientDetails(String givenID) {
boolean found = false;
int index = 0;
for(;index<aListOfClientDetails.size();index++){
if((aListOfClientDetails.get(index).ClientID.equals(givenID)))
found = true;
}
if(found)
return aListOfClientDetails.get(index);
else return null;
}
}
aListOfClientDetails 列表格式 它读取文件并创建 ClientDetails 列表。
[IC-x00042W Ms LQ Bethea 205, Willis Road Bolton BO5 1DQ 2000000007 2000100037 2006200319,
IC-x00033D Mr R Bowie 119, Thatcher Way Glasgow GL9 5SX 2006000016 2003100008 2005300001,
IC-x00013A MS GRV Blackwell 209, Drunk Road Hawick HK8 1MY 2006000009 2004100014 2003200304,
IC-x00018O Ms NAP Wallis 244, Grubb Lane Durham DU4 4ZX 2000000006 2003100012 2006200305]
一行是列表的一个对象。使用上面的方法，我尝试返回通过 ID 找到的列表的对象(例如第一个 token IC-x00042W)。但是，当我在主方法中运行它时，它仅返回第一个对象。(IC-x00042W/Ms/LQ/Bethea/205，Willis Road/Bolton/BO5.....) 如果我通过另一个对象的 id 进行搜索，它会返回 null。
ClientDetailsList 来源:
txt文件包含以下数据:
IC-x00042W/Ms/LQ/Bethea/205, Willis Road/Bolton/BO5 1DQ/2000000007/2000100037/2006200319#
IC-x00033D/Mr/R/Bowie/119, Thatcher Way/Glasgow/GL9 5SX/2006000016/2003100008/2005300001#
IC-x00013A/MS/GRV/Blackwell/209, Drunk Road/Hawick/HK8 1MY/2006000009/2004100014/2003200304#
IC-x00018O/Ms/NAP/Wallis/244, Grubb Lane/Durham/DU4 4ZX/2000000006/2003100012/2006200305#
IC-x00037N/Miss/DOD/Burke/272, Ambrose Lane/Cambridge/CB2 2XD/2005000003/2001100020#
IC-x00039A/Dr/X/Salter/285, Bannister Road/Sea Palling/SP2 6GW/2000000002/2005100029/2005200306#
IC-x00011I/MR/R/Reece/104, Bannister Lane/Cromer/CR0 6LD/2005000012/2003100001/2001200300#
IC-x00025V/Mr/P/Abbott/163, Drunk Lane/Hunstanton/HU1 1UR/2003000029/2004100017#
IC-x00008L/Dr/P/Runyon/150, Tick Tock Way/Swindon/SW8 4OJ/2004000005/2006100005/2001200316#
IC-x00028F/MR/X/Watt/267, Malton Road/Cambridge/CB4 1PQ/2004100016/2004200312#
IC-x00031X/Mr/S/Lorenz/276, Tick Tock Way/London/LN9 7ID/2005000023/2005100007#
IC-x00020C/Mr/LNV/Mcmillan/44, Drunk Street/London/LN6 1RG/2001000019#
IC-x00015H/Mr/TQZ/Dubose/201, Drunk Road/London/LN4 5RA/2003000026/2006100028/2000200307#
//Creates ClientsDetailsList from source file
public static ClientsDetailsList readFile(File inputFile) throws IOException{
ArrayList <String> clientData = new ArrayList<String>();
ArrayList <ClientDetails> cdList = new ArrayList<>();
ArrayList <PolicyList> arrayofPolsLists = new ArrayList<>();
//Lists of ClientDetails fields
ArrayList <Name> clientName = new ArrayList<>();
ArrayList <String> clientID = new ArrayList<String>();
ArrayList <Address> clientAddress = new ArrayList<>();
// Lists of Name class fields
ArrayList <String> clientTitle = new ArrayList<String>();
ArrayList <String> clientInitials = new ArrayList<String>();
ArrayList <String> clientSurname = new ArrayList<String>();
//Lists of Address class fields
ArrayList <String> clientStreet = new ArrayList<String>();
ArrayList <String> clientCity = new ArrayList<String>();
ArrayList <String> clientPostCode = new ArrayList<String>();
ArrayList <ArrayList <Policy>> list = new ArrayList<ArrayList<Policy>>();
Scanner fileScan = new Scanner(inputFile);
fileScan.useDelimiter("#");
int i =0;
//Reading the file
while(fileScan.hasNext()){
clientData.add(fileScan.next());
Scanner cdScan = new Scanner(clientData.get(i));
cdScan.useDelimiter("/");
ArrayList <String> tokens = new ArrayList<String>();
ArrayList <Policy> clientPolicyNo = new ArrayList<>();
while(cdScan.hasNext()){
tokens.add(cdScan.next());
}
clientID.add(tokens.get(0));
clientTitle.add(tokens.get(1));
clientInitials.add(tokens.get(2));
clientSurname.add(tokens.get(3));
clientStreet.add(tokens.get(4));
clientCity.add(tokens.get(5));
clientPostCode.add(tokens.get(6));
boolean whileController = true;
while(whileController){
clientPolicyNo.add(new Policy(tokens.get(7)));
switch(tokens.size()){
case 9 : clientPolicyNo.add(new Policy(tokens.get(8)));
break;
case 10: clientPolicyNo.add(new Policy(tokens.get(8)));
clientPolicyNo.add(new Policy(tokens.get(9)));
break;
case 11: clientPolicyNo.add(new Policy(tokens.get(8)));
clientPolicyNo.add(new Policy(tokens.get(9)));
clientPolicyNo.add(new Policy(tokens.get(10)));
break;
}
whileController=false;
}
list.add(clientPolicyNo);
i++;
}
//Adding policy lists
for(int j =0; j<clientID.size();j++){
arrayofPolsLists.add(new PolicyList());
arrayofPolsLists.get(j).aListOfPolicies=list.get(j);
}
//Creating Name objects
for(int j =0;j<clientID.size();j++){
clientName.add(new Name());
clientName.get(j).Title = clientTitle.get(j);
clientName.get(j).Initials = clientInitials.get(j);
clientName.get(j).Surname = clientSurname.get(j);
}
//Creating Address objects
for(int j =0;j<clientID.size();j++){
clientAddress.add(new Address());
clientAddress.get(j).street = clientStreet.get(j);
clientAddress.get(j).city = clientCity.get(j);
clientAddress.get(j).postcode = clientPostCode.get(j);
}
//Creating ClientDetails
for(int j =0;j<clientID.size();j++){
cdList.add(new ClientDetails());
cdList.get(j).ClientID = clientID.get(j);
cdList.get(j).fullName = clientName.get(j);
cdList.get(j).fullAddress = clientAddress.get(j);
cdList.get(j).clientsPolicies = arrayofPolsLists.get(j);
}
//Creating a ClientDetailsList object
ClientsDetailsList ClientDetList = new ClientsDetailsList();
ClientDetList.aListOfClientDetails = cdList;
return ClientDetList;
}
ClientDetails 类有 4 个字段:
public String ClientID;
public Name fullName;
public Address fullAddress;
public PolicyList clientsPolicies;
主要方法
File clientsFile = new File("ClientDetailsInput");
InputData e = new InputData();
ClientsDetailsList testList = new ClientsDetailsList();
testList = e.readFile(clientsFile);
System.out.println(testList.getClientDetails("IC-x00013A"));
最佳答案
在 found = true; 之后放置一个 break，例如...
public ClientDetails getClientDetails(String givenID) {
boolean found = false;
int index = 0;
for(;index<aListOfClientDetails.size();index++){
if((aListOfClientDetails.get(index).ClientID.equals(givenID))) {
found = true;
break;
}
}
if(found)
return aListOfClientDetails.get(index);
else return null;
}
或者您可以进一步简化它，例如根本不需要 index
public ClientDetails getClientDetails(String givenID) {
boolean found = false;
int index = 0;
ClientDetails details = null;
for (ClientDetails check : aListOfClientDetails) {
if(check.ClientID.equals(givenID)) {
details = check;
break;
}
}
return details;
}
已更新
实际能够读取数据后，我添加了
String check = aListOfClientDetails.get(index).ClientID;
System.out.println(givenID + " = " + check);
if ((check.equals(givenID))) {
到搜索列表并打印...
IC-x00013A = IC-x00042W
IC-x00013A =
IC-x00033D
IC-x00013A =
IC-x00013A
IC-x00013A =
IC-x00018O
IC-x00013A =
IC-x00037N
IC-x00013A =
IC-x00039A
IC-x00013A =
IC-x00011I
IC-x00013A =
IC-x00025V
IC-x00013A =
IC-x00008L
IC-x00013A =
IC-x00028F
IC-x00013A =
IC-x00031X
IC-x00013A =
IC-x00020C
IC-x00013A =
IC-x00015H
...这让我很害怕，直到我意识到 ID 的前缀是换行符...!
所以我所做的就是在读取方法中将 trim 添加到 tokens 的每个结果中...
clientID.add(tokens.get(0).trim());
(我对每一行都做了，只是没有显示)，然后导致
Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 13, Size: 13
at java.util.ArrayList.rangeCheck(ArrayList.java:638)
at java.util.ArrayList.get(ArrayList.java:414)
at testsearch.TestSearch$ClientsDetailsList.getClientDetails(TestSearch.java:47)
at testsearch.TestSearch.main(TestSearch.java:23)
这就是我期望在您的搜索方法中发生的情况......
如果我们仔细看看搜索循环......
for(;index<aListOfClientDetails.size();index++){
if((aListOfClientDetails.get(index).ClientID.equals(givenID)))
found = true;
}
您应该能够看到，无论 found 的状态如何，index 始终等于 aListOfClientDetails.size() 在循环结束时，因为循环没有其他退出条件考虑 found...
这让我回到了最初的建议......
永远不要低估一个简单的 System.out.println 语句的力量来检查你的理智和一个好的调试器......
关于java - 搜索(通过给定 ID)方法仅返回第一个对象，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/25441190/