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AbstractCollectionDemo1.java

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package TreeSet;
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import java.util.AbstractCollection;
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import java.util.HashSet;
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import java.util.TreeSet;
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import java.util.concurrent.CopyOnWriteArraySet;
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public class AbstractCollectionDemo1 {
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AbstractCollection<Integer> demoCollection = new HashSet<>();
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AbstractCollection<Integer> demoCollection1 = new TreeSet<>();
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AbstractCollection<Integer> demoCollection2 = new CopyOnWriteArraySet<>();
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public static void main(String[] args) {
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AbstractCollectionDemo1 a = new AbstractCollectionDemo1();
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a.demoCollection.add(1);
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a.demoCollection.add(2);
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a.demoCollection.add(3);
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a.demoCollection.add(4);
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System.out.println(a.demoCollection);
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}
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}

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