Original code:
public class TrainComposition { public void attachWagonFromLeft(int wagonId) { throw new UnsupportedOperationException("Waiting to be implemented."); } public void attachWagonFromRight(int wagonId) { throw new UnsupportedOperationException("Waiting to be implemented."); } public int detachWagonFromLeft() { throw new UnsupportedOperationException("Waiting to be implemented."); } public int detachWagonFromRight() { throw new UnsupportedOperationException("Waiting to be implemented."); } public static void main(String[] args) { TrainComposition train = new TrainComposition(); train.attachWagonFromLeft(7); train.attachWagonFromLeft(13); System.out.println(train.detachWagonFromRight()); // 7 System.out.println(train.detachWagonFromLeft()); // 13 } }
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