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this.cars = cars.clone();
public class Cars implements Cloneable {
private String carId;
private String coordinate;
public Cars(String carId, String coordinate)
{
this.carId=carId;
this.coordinate=coordinate;
}
}
@Override //协变
public Cars clone(){
Cars cars = null;
try {
cars = (Cars) super.clone();
} catch (CloneNotSupportedException e) {
e.printStackTrace();
}
return cars;
}