JAVA关于多线程中对象的调用问题

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JAVA关于多线程中对象的调用问题

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public class test {

    public static void main(String[] args) {

        WarnCars car = null;
        car = getCar();

        CarTest test = new CarTest();
        test.setCar(car);
        test.start();

        DataChangeTest testdata = new DataChangeTest();
        testdata.setCar(car);
        testdata.start();

    }

}


public class CarTest extends Thread {
    WarnCars car = null;

    public void setCar(WarnCars car) {
        this.car = car;
    }

    public void run() {
        //do sth
    }

}

public class DataChangeTest extends Thread {

    WarnCars car = null;

    public void run() {
        //do sth
    }

    public void setCar(WarnCars car) {
        this.car = car;
    }
}