我有一个应用程序,它的主要方法产生了一百个线程(假设我们模拟了一百个账号)。我正在尝试它,我希望它只是在使用Control-C进行打印时打印终止。
我读过你可以用ShutDownHooks做到这一点所以我在主方法中添加了以下内容:
Runtime.getRuntime().addShutdownHook(new Thread() {
public void run() {
System.out.println("Terminating");
}
});
然而,当我跑步时,没有任何东西被打印出来。
你能不能给我一些关于我出错的地方的指导(所有线程都在for循环中声明并从调用start方法开始)?
此致 乔治
编辑:请参阅下面的代码:
银行类:
public class Bank {
private final double[] accounts;
public Bank(int n, double initialBalance) {
accounts = new double[n];
for (int i=0; i < accounts.length;i++) {
accounts[i] = initialBalance;
}
}
public double getTotalBalance() {
double sum = 0.0;
for (int i=0; i < accounts.length; i++) {
sum += accounts[i];
}
return sum;
}
public synchronized void transfer(int fa, int ta, double amt) throws InterruptedException{
System.out.print(Thread.currentThread());
if (accounts[fa] < amt){
wait();
}
accounts[ta] -= amt;
System.out.println("Transfer of amount: " + amt + " from: " + fa + " Transfer to: " + ta);
accounts[fa] += amt;
System.out.println("Total Balance: " + getTotalBalance());
notifyAll();
}
public int size() {
return accounts.length;
}
public double[] getAccounts(){
return accounts;
}
}
BankTest Class:
public class BankTest {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
Bank b = new Bank(100,1000);
int i;
long timeStart = System.currentTimeMillis();
long j = System.currentTimeMillis();
for (i=0; i < b.size(); i++) {
TransferRunnable tr = new TransferRunnable(b, i, 1000,j);
Thread t = new Thread(tr);
t.start();
}
Runtime.getRuntime().addShutdownHook(new Thread() {
public void run() {
System.out.println("Terminating");
}
});
}
}
TransferRunnable Class:
public class TransferRunnable implements Runnable {
private Bank b;
private int fromAccount;
private double maxAmount;
private final int DELAY = 40;
private long timeStart;
public TransferRunnable(Bank b, int from, double max, long timems) {
this.b = b;
fromAccount = from;
maxAmount = max;
timeStart = timems;
}
@Override
public void run() {
try {
while (true) {
int ta = (int) (b.size() * Math.random());
double amount = maxAmount * Math.random();
double[] acc = b.getAccounts();
b.transfer(fromAccount,ta,amount);
Thread.sleep((int) (DELAY*Math.random()));
}
}
catch (InterruptedException e) {
}
}
}
答案 0 :(得分:0)
运行时会打印出来。您可以将System.out.flush();
添加到run()方法的末尾,这样可以确保立即打印输出。
答案 1 :(得分:0)
CTRL+C
完全终止进程而不是要求它关闭(例如SIGKILL vs SIGINT)。你能验证你发送Java进程的信号吗?
最后,作为最后的手段,您可以尝试以下Java:
if (FileDescriptor.out.valid()) {
FileDescriptor.out.sync();
}
我怀疑这不会有任何不同!