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setDemo.java

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import java.util.HashSet;
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import java.util.Set;
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public class setDemo {
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Set <Integer> set = new HashSet<>();
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public static void main(String[] args){
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setDemo setDemo = new setDemo();
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setDemo.set.add(1);
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setDemo.set.add(1);
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setDemo.set.add(2);
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setDemo.set.add(3);
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setDemo.set.add(4);
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setDemo.set.add(5);
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System.out.println(setDemo.set);
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}
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}

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