Java TreeMap Particular Key Exists Example

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import java.util.TreeMap;

public class JavaTreeMapKeyExists {

	public static void main(String[] args) {

		TreeMap<String, String> treeMap = new TreeMap<String, String>();
		treeMap.put("1", "One");
		treeMap.put("2", "Two");
		treeMap.put("3", "Three");

		System.out.println(treeMap.containsKey("1"));
	}
}
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