Java Reference
In-Depth Information
Display 16.6
HashSet<T>
Class Demo
(part 2 of 3)
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System.out.println("Contents of set round: ");
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outputSet(round);
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System.out.println("\nContents of set green: ");
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outputSet(green);
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System.out.println("\nball in set 'round'? " +
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round.contains("ball"));
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System.out.println("ball in set 'green'? " +
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green.contains("ball"));
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System.out.println("\nball and peas in same set? " +
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((round.contains("ball") &&
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(round.contains("peas"))) ||
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(green.contains("ball") &&
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(green.contains("peas")))));
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System.out.println("pie and grass in same set? " +
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((round.contains("pie") &&
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(round.contains("grass"))) ||
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(green.contains("pie") &&
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(green.contains("grass")))));
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// To union two sets we use the addAll method.
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HashSet<String> setUnion =
new
HashSet<String>(round);
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round.addAll(green);
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System.out.println("\nUnion of green and round:");
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outputSet(setUnion);
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// To intersect two sets we use the removeAll method.
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HashSet<String> setInter =
new
HashSet<String>(round);
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setInter.removeAll(green);
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System.out.println("\nIntersection of green and round:");
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outputSet(setInter);
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System.out.println( );
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}
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}
Sample Dialogue
Contents of set round:
grapes pie ball peas
Contents of set green:
grass garden hose grapes peas
(continued)
