我正在尝试将 csv 文件中的项目放入哈希图中。通过添加项目，我的意思是对它们进行分类。csv 充满了问题列表中的答案。所以csv是这样建立的：
Person Question
- Do you wear glasses
1 Yes
2 Yes
3 No
4 Sometimes
我想做的下一步是读取项目并将答案放入哈希图中，键是答案的名称，值是特定答案的数量。
hashmap 应该与我之前给出的示例类似：
Yes, 2
No, 1
Sometimes, 1
我现在像这样循环：
for (int j = 0; j < dataPersonList.size(); j++)
{
// looping through the csv
while (t.hasNext ())
{
// looping through the hashmap
Map.Entry me = (Map.Entry)t.next();
if (dataPersonVar.glasses.equals(me.getKey()))
{
// if the item in the csv is the same as the item in the hashmap
hm.put(me.getKey(), me.getValue() =+ 1); // the value gets +1
}
else
{
// a new item is made and gets automatically 1
hm.put(dataPersonVar.glasses,1);
}
}
}
但显然这行不通。我是哈希图的初学者，但我真的认为哈希图是解决我问题的方法。我在处理工作。有人知道如何解决这个问题吗？如果我不够清楚，请告诉我！
提前致谢
编辑：
根据要求，我特此发布完整代码：
import java.util.Iterator;
import java.util.Map;
HashMap hm = new HashMap();
import de.bezier.data.*;
int totalParticipants;
int bgWidth = 1000;
int bgHeight = 1000;
int x;
int eSize = 10;
int opacity = 100;
float xLocation;
float yLocation;
String travelType;
int travelTime;
int border=400;
float dataMinLat=1000;
float dataMaxLat;
float dataMinLon=1000;
float dataMaxLon;
float xLocationMM = (5.17880);
float yLocationMM = (52.22541);
ArrayList dataPersonList = new ArrayList();
ArrayList dataFunctionList = new ArrayList(100);
Point[] pointList = new Point[1000];
float angle;
XlsReader reader;
PImage kaart;
void setup ()
{
textSize(10);
size(bgWidth, bgHeight);
background(0);
noStroke();
smooth();
//kaart = loadImage("map.png");
yLocationMM = 0 - yLocationMM;
reader = new XlsReader( this, "MMdata.xls" ); // assumes file to be in the data folder
totalParticipants = reader.getLastRowNum();
for (int i = 1;i < totalParticipants+1; i++) {
DataPerson dataPerson = new DataPerson();
dataPerson.function = reader.getString(i, 23);
dataPerson.firstName = reader.getString(i, 1);
dataPerson.lastName = reader.getString(i, 2);
dataPerson.glasses = reader.getString(i, 20);
dataPerson.longitude = reader.getFloat(i, 55);
dataPerson.latitude = reader.getFloat(i, 54);
dataPerson.location = reader.getString(i, 8);
dataPerson.ownage = reader.getString(i, 14);
dataPerson.traveltime = reader.getInt(i, 31);
dataPerson.establishment = reader.getString(i, 58);
dataPerson.traveltype = reader.getString(i, 17);
dataPersonList.add(dataPerson);
}
for (int i = 0; i < dataPersonList.size(); i++) {
DataPerson person = (DataPerson) dataPersonList.get(i);
for (int j = 0; j < dataFunctionList.size() + 1; j++) {
DataFunction dataFunction = null;
if (j < dataFunctionList.size())
{
dataFunction = (DataFunction) dataFunctionList.get(j);
}
if (dataFunction != null) {
if (person.function.equals(dataFunction.function)) {
dataFunction.persons.add(person);
dataFunction.amount ++;
break;
}
}
else {
dataFunction = new DataFunction();
dataFunction.function = person.function;
dataFunction.amount = 1;
dataFunction.persons.add(person);
dataFunctionList.add(dataFunction);
break;
}
}
}
for (int i = 0; i < dataPersonList.size(); i++) {
DataPerson dataPersonVar = (DataPerson) dataPersonList.get(i);
if (dataPersonVar.longitude > dataMaxLon) {
dataMaxLon = dataPersonVar.longitude;
}
else if (dataPersonVar.longitude < dataMinLon) {
dataMinLon = dataPersonVar.longitude;
}
if (dataPersonVar.latitude > dataMaxLat) {
dataMaxLat = dataPersonVar.latitude;
}
else if (dataPersonVar.latitude < dataMinLat) {
dataMinLat = dataPersonVar.latitude;
}
}
}
class DataPerson
{
String function;
String firstName;
String lastName;
String glasses;
float longitude;
float latitude;
String location;
String ownage;
int traveltime;
String establishment;
String traveltype;
String fullName()
{
return firstName + " " + lastName;
}
}
class DataFunction
{
String function;
int amount;
ArrayList persons = new ArrayList();
String getPersonNames()
{
String output = "";
for (int i = 0; i < persons.size(); i++) {
DataPerson person = (DataPerson) persons.get(i);
output += person.firstName + "(" + person.glasses + ") ";
}
return output;
}
}
class Point
{
float x;
float y;
}
void draw()
{
background(0);
strokeWeight(2);
x=50;
int xText=80;
int procentGlasses;
noStroke();
pushMatrix();
scale(1.40, 0.89);
//image(kaart, -250, -360);
popMatrix();
for (int i = 0; i < dataPersonList.size(); i++) {
DataPerson dataPersonVar = (DataPerson) dataPersonList.get(i);
if (dataPersonVar != null) {
xLocation = map(dataPersonVar.longitude, dataMinLon, dataMaxLon, border, bgWidth-border);
yLocation = map(dataPersonVar.latitude, dataMinLat, dataMinLat+(dataMaxLon-dataMinLon), border, bgHeight-border);
travelType = (dataPersonVar.traveltype);
noFill();
if (travelType.equals("By car")) {
stroke(0, 0, 255, opacity+100);
}
else if (travelType.equals("By public transport")) {
stroke(255, 0, 0, opacity);
}
else {
stroke(255, opacity);
}
//text(dataPersonVar.firstName, xLocation, yLocation);
noStroke();
strokeWeight(4);
stroke(100, 15);
strokeWeight(2);
}
}
for (int i = 0; i < dataPersonList.size(); i++) {
DataPerson dataPersonVar = (DataPerson) dataPersonList.get(i);
if (dataPersonVar != null) {
xLocation = map(dataPersonVar.longitude, dataMinLon, dataMaxLon, border, bgWidth-200);
yLocation = map(dataPersonVar.latitude, dataMinLat, dataMinLat+(dataMaxLon-dataMinLon), border, bgHeight-200);
noStroke();
fill(255, 200);
ellipse(xLocation, yLocation, eSize, eSize);
//println(dataPersonVar.glasses);
Iterator t = hm.entrySet().iterator(); // Get an iterator
for (int j = 0; j < dataPersonList.size(); j++) {
while (t.hasNext ()) {
Map.Entry me = (Map.Entry)t.next();
println("die in de dataPersonshit is "+dataPersonVar.glasses+". En de andere waarde is "+me.getKey());
if (dataPersonVar.glasses.equals(me.getKey())) {
hm.put(me.getKey(), ((Integer)me.getValue()) + 1);
}
else {
hm.put(dataPersonVar.glasses, 1);
//println("YEAH");
}
}
}
/////////drawing the circle///////////////
angle = ((PI*2)/15*1)/dataPersonList.size()*i;
stroke(255, 100, 50, 50);
noFill();
strokeWeight(3);
pointList[i] = new Point();
pointList[i].x = bgWidth/2+sin(angle)*400; // de punt van x = 400 ( het middelpunt van de cirkel ) + sin((360 graden) / het totaal
pointList[i].y = bgHeight/2+cos(angle)*400;
beginShape();
vertex(xLocation, yLocation);
quadraticVertex((xLocation+pointList[i].x)/2, yLocation, pointList[i].x, pointList[i].y);
endShape();
}
}
}
不幸的是，我不能给你 csv，但我希望代码至少有帮助。