Bank.zip_Table_条件查询

/* * To change this template, choose Tools | Templates * and open the template in the editor. */ package bank; import java.util.concurrent.locks.Condition; import java.util.concurrent.locks.Lock; import java.util.concurrent.locks.ReentrantLock; /** * * @author Administrator */ public class Bank { /** 9. * Constructs the bank. 10. * @param n the number of accounts 11. * @param initialBalance the initial balance for each account 12. */ public Bank(int n, double initialBalance) { accounts = new double[n]; for (int i = 0; i < n; i++) accounts[i] = initialBalance; bankLock = new ReentrantLock(); sufficientFunds = bankLock.newCondition(); } public void transfer(int from, int to, double amount) throws InterruptedException { bankLock.lock(); try{ while (accounts[from] < amount) sufficientFunds.await(); System.out.print(Thread.currentThread()); accounts[from] -= amount; System.out.printf(" %10.2f from %d to %d", amount, from, to); accounts[to] += amount; System.out.printf(" Total Balance: %10.2f%n", getTotalBalance()); sufficientFunds.signalAll(); }finally { bankLock.unlock(); } } /** 37. * Gets the sum of all account balances. 38. * @return the total balance 39. */ public double getTotalBalance() { double sum = 0; for (double a : accounts) sum += a; return sum; } /** 51. * Gets the number of accounts in the bank. 52. * @return the number of accounts 53. */ public int size() { return accounts.length; } private final double[] accounts; private Lock bankLock; private Condition sufficientFunds; }