如何解决如何修改显示数据损坏问题的代码
我目前正在一个项目上,向我展示数据损坏问题的外观。
下面给出的代码(What is balance? 4
)的输出不正确,因为一个任务将覆盖另一个任务。我想知道如何才能重写代码,使余额始终为100。
import java.util.concurrent.*;
public class AccountWithoutSync {
private static Account account = new Account();
public static void main(String[] args) {
ExecutorService executor = Executors.newCachedThreadPool(); //create thread pool
// Create and launch 100 threads
for (int i = 0; i < 100; i++) {
executor.execute(new AddAPennyTask());
}
executor.shutdown();
// Wait until all tasks are finished
while (!executor.isTerminated()) {
}
System.out.println("What is balance? " + account.getBalance());
}
// A thread for adding a penny to the account
private static class AddAPennyTask implements Runnable {
public void run() {
account.deposit(1);
}
}
// An inner class for account
private static class Account {
private int balance = 0;
public int getBalance() {
return balance;
}
public void deposit(int amount) {
int newBalance = balance + amount;
// This delay is deliberately added to magnify the
// data-corruption problem and make it easy to see.
try {
Thread.sleep(5);
}
catch (InterruptedException ex) {
}
balance = newBalance;
}
}
}
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