java.util.TreeMap.containsValue()方法用于检查TreeMap中的任何键是否正在映射特定值。它将Value作为参数,如果该值由映射中的任何键映射,则返回True。

句法:

Tree_Map.containsValue(Object Value)

参数:该方法只接受一个参数Value类型的Object,并引用其映射应该由map中的任何键检查的值。

返回值:如果检测到值的映射,则该方法返回布尔值true,否则返回false。

下面的程序用于说明java.util.TreeMap.containsValue()的工作方法

程序1:将字符串值映射到整数键。

// Java code to illustrate the containsValue() method
import java.util.*;
  
public class Tree_Map_Demo {
    public static void main(String[] args)
    {
  
        // Creating an empty TreeMap
        TreeMap<Integer, String> tree_map = new TreeMap<Integer, String>(); 
  
        // Mapping string values to int keys
        tree_map.put(10, "Geeks");
        tree_map.put(15, "4");
        tree_map.put(20, "Geeks");
        tree_map.put(25, "Welcomes");
        tree_map.put(30, "You");
  
        // Displaying the TreeMap
        System.out.println("Initial Mappings are: " + tree_map);
  
        // Checking for the Value 'Geeks'
        System.out.println("Is the value 'Geeks' present? " + 
        tree_map.containsValue("Geeks"));
  
        // Checking for the Value 'World'
        System.out.println("Is the value 'World' present? " +
        tree_map.containsValue("World"));
    }
}

程序2:将整数值映射到字符串键。

// Java code to illustrate the containsValue() method
import java.util.*;
 
public class Tree_Map_Demo {
    public static void main(String[] args)
    {
 
        // Creating an empty TreeMap
        TreeMap<String, Integer> tree_map = new TreeMap<String, Integer>(); 
 
        // Mapping int values to string keys
        tree_map.put("Geeks", 10);
        tree_map.put("4", 15);
        tree_map.put("Geeks", 20);
        tree_map.put("Welcomes", 25);
        hastree_map_map.put("You", 30);
 
        // Displaying the TreeMap
        System.out.println("Initial Mappings are: " + tree_map);
 
        // Checking for the Value '10'
        System.out.println("Is the value '10' present? " + 
        tree_map.containsValue(10));
 
        // Checking for the Value '30'
        System.out.println("Is the value '30' present? " + 
        tree_map.containsValue(30));
 
        // Checking for the Value '40'
        System.out.println("Is the value '40' present? " + 
        tree_map.containsValue(40));
    }
}

注意:对于具有不同数据类型的变体和组合的任何类型的映射,都可以执行相同的操作。

 
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