[Ch15] Synchronised version of the updated Ryan and Monica problem (7518478d) · Commits · examples / Head First Java 3rd Edition

src/main/java/ch15/ryanmonica/RyanAndMonicaSynchronizedTest.java

+17 −25

Changes for src/main/java/ch15/ryanmonica/RyanAndMonicaSynchronizedTest.java: 17 added lines, 25 removed lines.
Original line number	Diff line number	Diff line
		@@ -2,11 +2,9 @@ package ch15.ryanmonica;

		import java.util.concurrent.ExecutorService;
		import java.util.concurrent.Executors;
		import java.util.concurrent.TimeUnit;

		public class RyanAndMonicaSynchronizedTest {
		public static void main(String[] args) throws InterruptedException {
		long start = System.currentTimeMillis();
		BankAccountSynchronized account = new BankAccountSynchronized();
		RyanAndMonicaSynchronizedJob ryan = new RyanAndMonicaSynchronizedJob("Ryan", account);
		RyanAndMonicaSynchronizedJob monica = new RyanAndMonicaSynchronizedJob("Monica", account);
		@@ -14,9 +12,6 @@ public class RyanAndMonicaSynchronizedTest {
		executor.execute(ryan);
		executor.execute(monica);
		executor.shutdown();
		executor.awaitTermination(1, TimeUnit.MINUTES);
		long end = System.currentTimeMillis();
		System.out.println(end - start);
		}
		}

		@@ -30,38 +25,35 @@ class RyanAndMonicaSynchronizedJob implements Runnable {
		}

		public void run() {
		for (int i = 0; i < 10; i++) {
		account.makeWithdrawal(10, name);
		if (account.getBalance() < 0) {
		System.out.println("Overdrawn!");
		for (int i = 0; i < 5; i++) {
		goShopping(10);
		}
		}

		private void goShopping(int amount) {
		synchronized (account) {
		if (account.getBalance() >= amount) {
		System.out.println(name + " is about to spend");
		account.spend(amount);
		System.out.println(name + " finishes spending");
		} else {
		System.out.println("Sorry, not enough for " + name);
		}
		}
		}
		}

		class BankAccountSynchronized {
		private int balance = 100;
		private int balance = 50;

		public int getBalance() {
		return balance;
		}

		private void withdraw(int amount) {
		public void spend(int amount) {
		balance = balance - amount;
		}

		public synchronized void makeWithdrawal(int amount, String name) {
		if (balance >= amount) {
		System.out.println(name + " is about to withdraw");
		try {
		System.out.println(name + " is going to sleep");
		Thread.sleep(500);
		} catch (InterruptedException ex) {ex.printStackTrace();}
		System.out.println(name + " woke up.");
		withdraw(amount);
		System.out.println(name + " completes the withdrawal");
		} else {
		System.out.println("Sorry, not enough for " + name);
		if (balance < 0) {
		System.out.println("Overdrawn!");
		}
		}
		}

src/main/java/ch15/ryanmonica/RyanAndMonicaTest.java

+6 −6

File changed.

Contains only whitespace changes.