我用 Java 編寫了這段代碼Runnable，但我的教授希望我添加AtomicInteger，以便不存在線程干擾。我該如何去做呢？我嘗試查找如何在代碼中使用它的示例，但我不知道在這種情況下該怎么做。public class GarageWorker { public static void main(String[] args) { System.out.println("We are going to count the vehicles in the garage"); System.out.println(); System.out.println("There are 50 vehicles in the garage to start with!"); System.out.println(); GarageWorker garage = new GarageWorker(50); Runnable vehicleEnter = garage.new Enter(); Runnable vehicleExit = garage.new Exit(); Thread thread1 = new Thread(vehicleEnter); Thread thread2 = new Thread(vehicleExit); thread1.start(); thread2.start(); } public GarageWorker(int initialCarCount) { counter = initialCarCount; } public int counter; public class Enter implements Runnable { public Enter() { } public int increaseVehicleCount() { return ++counter; } public void run() { while (counter < 100) { System.out.println("One vehicle entered the garage now there are " + increaseVehicleCount()); } } } public class Exit implements Runnable { public Exit() { } public int decreaseVehicleCount() { return --counter; } public void run() { while (counter > 0) { System.out.println("One vehicle left the garage now there are " + decreaseVehicleCount()); } } }}代碼運(yùn)行良好，但我的教授希望我將AtomicInteger類實(shí)現(xiàn)到代碼中。
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我猜你的教授希望你counter改成AtomicInteger.?首先，您需要導(dǎo)入AtomicInteger并更改構(gòu)造函數(shù)的聲明counter以反映這一點(diǎn)。
import java.util.concurrent.atomic.AtomicInteger;
public GarageWorker(int initialCarCount) {
? ? counter = new AtomicInteger(initialCarCount);
}
public AtomicInteger counter;
另外，您想要更改increaseVehicleCount和decreaseVehicleCount方法以便使用AtomicInteger代替int。
public int increaseVehicleCount() {
? ? return counter.incrementAndGet();
}
public int decreaseVehicleCount() {
? ? return counter.decrementAndGet();
}
incrementAndGet以及正如decrementAndGet他們所說：它們遞增（或遞減）并隨后返回新值。
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