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    Java.util.TreeSet.contains()方法用于检查TreeSet中是否存在特定元素。所以基本上它用于检查TreeSet是否包含任何特定元素。

    句法:

    Tree_Set.contains(Object element)

    参数:参数元素属于TreeSet类型。如果它存在于TreeSet中,则需要检查该元素。

    返回值:如果元素存在于集合中,则该方法返回true,否则返回False。

    下面的程序说明了Java.util.TreeSet.conatins()方法:

    // Java code to illustrate contains() method
    import java.io.*;
    import java.util.TreeSet;
    
    public class TreeSetDemo {
        public static void main(String args[])
        {
            // Creating an empty TreeSet
            TreeSet<String> tree = new TreeSet<String>();
    
            // Use add() method to add elements into the Set
            tree.add("Welcome");
            tree.add("To");
            tree.add("Geeks");
            tree.add("4");
            tree.add("Geeks");
            tree.add("TreeSet");
    
            // Displaying the TreeSet
            System.out.println("TreeSet: " + tree);
    
            // Check for "TreeSet" in the set
            System.out.println("Does the Set contains 'TreeSet'? " + 
                                               tree.contains("TreeSet"));
    
            // Check for "4" in the set
            System.out.println("Does the Set contains '4'? " + 
                                                 tree.contains("4"));
    
            // Check if the list contains "No"
            System.out.println("Does the Set contains 'No'? " + 
                                                 tree.contains("No"));
        }
    }
    

    输出:

    TreeSet: [4, Geeks, To, TreeSet, Welcome]
    Does the Set contains 'TreeSet'? true
    Does the Set contains '4'? true
    Does the Set contains 'No'? false

     
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