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Change HashMap to HashSet for lookup field #196

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Change HashMap to HashSet for lookup field #196

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4 changes: 2 additions & 2 deletions Java/Ch 17. Hard/Q17_25_Word_Rectangle/WordGroup.java
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Original file line number Diff line number Diff line change
Expand Up @@ -5,7 +5,7 @@

/* A container for a group of words of the same length. */
public class WordGroup {
private HashMap<String, Boolean> lookup = new HashMap<String, Boolean>();
private HashSet<String> lookup = new HashSet<String>();
private ArrayList<String> group = new ArrayList<String>();

public WordGroup() {
Expand All @@ -18,7 +18,7 @@ public boolean containsWord(String s) {

public void addWord (String s) {
group.add(s);
lookup.put(s, true);
lookup.put(s);
}

public int length() {
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