import java.io.*;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.*;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors;
public class z31 {
public static void main(String[] args) {
ArrayList<creditcard4> cd = new ArrayList<>();
cd.add(new creditcard4("a","j",1));
cd.add(new creditcard4("d","r",1));
cd.add(new creditcard4("z","ww",31));
cd.add(new creditcard4("h","hh",1));
Map<String,List<creditcard4>> aaa = cd.stream().collect(Collectors.groupingBy(card->card.getName()));
System.out.println(aaa);
AtomicInteger value = new AtomicInteger(1);
Map<String, Integer> cardmap = cd.stream().collect(Collectors.toMap(card -> card.getName(), a->value.getAndIncrement()));
System.out.println(cardmap);
}
}
class creditcard4 {
public creditcard4(String company, String name, int limit) {
this.company = company;
this.name = name;
this.limit = limit;
}
String company;
String name;
int limit;
@Override
public String toString() {
return "creditcard4{" +
"company='" + company + '\'' +
", name='" + name + '\'' +
", limit=" + limit +
'}';
}
public String getCompany() {
return company;
}
public void setCompany(String company) {
this.company = company;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getLimit() {
return limit;
}
public void setLimit(int limit) {
this.limit = limit;
}
}
댓글 영역