Java Vector.removeAll方法代碼示例

import java.util.Vector; //導入方法依賴的package包/類
/**
 * This method returns all station (except sources and sinks) keys.
 */
@Override
public Vector<Object> getStationKeysNoSourceSink() {
	Vector<Object> keyset = new Vector<Object>();
	keyset.addAll(stationsKeyset);
	keyset.removeAll(sourcesKeyset);
	keyset.removeAll(sinksKeyset);
	return keyset;
}
 

import java.util.Vector; //導入方法依賴的package包/類
/**
 * This method returns all station (except sources and sinks) and blocking region keys.
 */
@Override
public Vector<Object> getStationRegionKeysNoSourceSink() {
	Vector<Object> keyset = new Vector<Object>();
	keyset.addAll(stationsKeyset);
	keyset.removeAll(sourcesKeyset);
	keyset.removeAll(sinksKeyset);
	keyset.addAll(blockingRegionsKeyset);
	return keyset;
}
 

import java.util.Vector; //導入方法依賴的package包/類
public static Vector<String> getRandomWithoutReplacementSequence(Random generator, int desiredSize, Vector<String> allElems) {

 		Vector<String> randomElems = new Vector<String> ();
 		HashSet<String> elemHashSet = new HashSet<String> ();
 		
 		// Build a hashSet varSet out of allElems
 		for(String anElem: allElems) {
 			elemHashSet.add(anElem);
 		}
 		
 		// Do we have enough elements to obtain a random sequence of desiredSize?
 		// If not, just use all elements for the sake of completion
 		// Ditto if we were asked to choose 0 elements
 		if ( (desiredSize <= 0) || (desiredSize >= elemHashSet.size())) {
 			randomElems = new Vector<String> (elemHashSet);
 			Collections.sort(randomElems);
 			return randomElems;
 		}
 		
 		// Randomly select variables until we have enough. As we go along, remove chosen variables to guarantee convergence.
 		// By design, we select random numbers following a uniform distribution
 		for(int i = 0; i < desiredSize; i++) {
 			
 			int pos = Utils.getRandomUniformNumber(generator, allElems.size());
 			String elem = allElems.get(pos);
 			randomElems.add(elem);
 			
 			// Ensure "Random Without Replacement" Strategy; thus remove all occurrences of elem
 			elemHashSet.remove(elem);
 			allElems.removeAll(Collections.singleton(elem));
 		}
 		
 		// The following sorting only makes sense when this method is invoked with strings representing variables, instead of attribute names
 		Collections.sort(randomElems);
 		return randomElems;		
 	}