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  1. import java.util.*;
  2. import java.util.stream.*;
  3. public class Main {
  4.     public static void main(String[] args) {
  5.         List<Account> accounts = new ArrayList<>();
  6.         accounts.add(new Account(1, "abc", 17998210, 190));
  7.         accounts.add(new Account(2, "hsj", 6786179, 190));
  8.         accounts.add(new Account(4, "ioip", 246179, 191));
  9.         accounts.add(new Account(4, "ewrew", 90179, 191));
  10.         Map<Integer, List<Account>> map = accounts.stream().collect(Collectors.groupingBy(Account::getCustomerID));
  11.         System.out.println(map);
  12.     }
  13. }
  14. class Account{
  15.     int id;
  16.     String type;
  17.     int balance;
  18.     int customerID;
  19.     public Account(int id, String type, int balance, int customerID){
  20.         this.id = id;
  21.         this.type = type;
  22.         this.balance = balance;
  23.         this.customerID = customerID;
  24.     }
  25. 	public int getId() {
  26. 		return id;
  27. 	}
  28. 	public void setId(int id) {
  29. 		this.id = id;
  30. 	}
  31. 	public String getType() {
  32. 		return type;
  33. 	}
  34. 	public void setType(String type) {
  35. 		this.type = type;
  36. 	}
  37. 	public int getBalance() {
  38. 		return balance;
  39. 	}
  40. 	public void setBalance(int balance) {
  41. 		this.balance = balance;
  42. 	}
  43. 	public int getCustomerID() {
  44. 		return customerID;
  45. 	}
  46. 	public void setCustomerID(int customerID) {
  47. 		this.customerID = customerID;
  48. 	}
  49. 	@Override
  50. 	public String toString() {
  51. 		return "Account [id=" + id + ", type=" + type + ", balance=" + balance + ", customerID=" + customerID + "]";
  52. 	}
  53. }
Success #stdin #stdout 0.2s 57288KB
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{190=[Account [id=1, type=abc, balance=17998210, customerID=190], Account [id=2, type=hsj, balance=6786179, customerID=190]], 191=[Account [id=4, type=ioip, balance=246179, customerID=191], Account [id=4, type=ewrew, balance=90179, customerID=191]]}
https://ideone.com/AXh8R8
language:
Java (12.0.1)
created:
2 years ago
visibility:
public

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