Define Map interface instead of implementation
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@ -21,6 +21,7 @@ import java.util.ArrayList;
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import java.util.Collection;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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/**
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* The Wallet handles the management of accounts with addresses and private keys.
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@ -33,12 +34,12 @@ public class Wallet {
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// private HashMap<Address, BigInteger> rows = new HashMap<>();
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// <address, info> table for a wallet
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private HashMap<String, Account> rows = new HashMap<String, Account>();
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private Map<String, Account> rows = new HashMap<>();
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private long high;
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private List<WalletListener> listeners = new ArrayList<WalletListener>();
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private List<WalletListener> listeners = new ArrayList<>();
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private HashMap<BigInteger, Transaction> transactionMap = new HashMap<BigInteger, Transaction>();
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private Map<BigInteger, Transaction> transactionMap = new HashMap<>();
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public void addNewAccount() {
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Account account = new Account();
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