package src.main.java;

public class Transaction implements Comparable<Transaction> {
    private int transactionId;
    private double amount;

    public Transaction(int transactionId, double amount) {
        this.transactionId = transactionId;
        this.amount = amount;
    }

    public int getTransactionId() {
        return transactionId;
    }

    public double getAmount() {
        return amount;
    }

    @Override
    public int compareTo(Transaction other) {
        return Integer.compare(this.transactionId, other.transactionId);
    }

    @Override
    public String toString() {
        return "Transaction{" +
                "transactionId=" + transactionId +
                ", amount=" + amount +
                '}';
    }
}

package src.main.java;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;

public class TransactionManager {
    private List<Transaction> transactions;

    public TransactionManager() {
        this.transactions = new ArrayList<>();
    }

    public void addTransaction(Transaction transaction) {
        transactions.add(transaction);
    }

    public void removeTransactionById(int transactionId) {
        Iterator<Transaction> iterator = transactions.iterator();
        while (iterator.hasNext()) {
            Transaction transaction = iterator.next();
            if (transaction.getTransactionId() == transactionId) {
                iterator.remove();
                break;
            }
        }
    }

    public void sortTransactionsById() {
        Collections.sort(transactions);
    }

    public void sortTransactionsByAmount() {
        transactions.sort((t1, t2) -> Double.compare(t1.getAmount(), t2.getAmount()));
    }

    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder();
        for (Transaction transaction : transactions) {
            sb.append(transaction.toString()).append("\n");
        }
        return sb.toString();
    }

    public static void main(String[] args) {
        TransactionManager manager = new TransactionManager();
        manager.addTransaction(new Transaction(1, 100.50));
        manager.addTransaction(new Transaction(2, 200.75));
        manager.addTransaction(new Transaction(3, 50.25));

        System.out.println("Transactions:");
        System.out.println(manager);

        manager.removeTransactionById(2);
        System.out.println("After removing transaction with ID 2:");
        System.out.println(manager);

        manager.sortTransactionsById();
        System.out.println("After sorting by transaction ID:");
        System.out.println(manager);

        manager.sortTransactionsByAmount();
        System.out.println("After sorting by amount:");
        System.out.println(manager);
    }
}