Home - News ( United States | United Kingdom | Italy | Germany ) - Football scores

Showing content from https://www.tutorialspoint.com/java/util/treemap_containsvalue.htm below:

Java TreeMap containsValue() Method

The Java TreeMap containsValue(Object value) method is used to return true if this map, maps one or more keys to the specified value.

Following is the declaration for java.util.TreeMap.containsValue() method.

public boolean containsValue(Object value)

value − This is the value whose presence in this map is to be tested.

The method call returns true if a mapping to this value exists otherwise false.

NA

The following example shows the usage of Java TreeMap containsValue() method to check if a value is present in a map or not. We've created a TreeMap object of Integer,Integer pairs. Then few entries are added to map and using containsValue() we're checking if value is present and then printing the same.

package com.tutorialspoint;

import java.util.TreeMap;

public class TreeMapDemo {
   public static void main(String[] args) {
      
      // creating tree map 
      TreeMap<Integer, Integer> treemap = new TreeMap<>();

      // populating tree map
      treemap.put(2, 2);
      treemap.put(1, 1);
      treemap.put(3, 3);
      treemap.put(6, 6);
      treemap.put(5, 5);

      System.out.println("Checking value");
      System.out.println("3 exists: "+ treemap.containsValue(3));
   }    
}

Let us compile and run the above program, this will produce the following result.

Checking value
3 exists: true

The following example shows the usage of Java TreeMap containsValue() method to check if a value is present in a map or not. We've created a TreeMap object of Integer,String pairs. Then few entries are added to map and using containsValue() we're checking if value is present and then printing the same.

package com.tutorialspoint;

import java.util.TreeMap;

public class TreeMapDemo {
   public static void main(String[] args) {
      
      // creating tree map 
      TreeMap<Integer, String> treemap = new TreeMap<>();

      // populating tree map
      treemap.put(2, "two");
      treemap.put(1, "one");
      treemap.put(3, "three");
      treemap.put(6, "six");
      treemap.put(5, "five");

      System.out.println("Checking value");
      System.out.println("'three' exists: "+ treemap.containsValue("three"));
   }    
}

Let us compile and run the above program, this will produce the following result.

Checking value
'three' exists: true

The following example shows the usage of Java TreeMap containsValue() method to check if a value is present in a map or not. We've created a TreeMap object of Integer,Student pairs. Then few entries are added to map and using containsValue() we're checking if value is present and then printing the same.

package com.tutorialspoint;

import java.util.TreeMap;

public class TreeMapDemo {
   public static void main(String[] args) {
      
      // creating tree map 
      TreeMap<Integer, Student> treemap = new TreeMap<>();

      // populating tree map
      treemap.put(2, new Student(2, "Robert"));
      treemap.put(1, new Student(1, "Julie"));  
      treemap.put(3, new Student(3, "Adam"));
      treemap.put(6, new Student(6, "Julia"));
      treemap.put(5, new Student(5, "Tom"));

      System.out.println("Checking value");
      System.out.println("Adam exists: "+ treemap.containsValue(new Student(3, "Adam")));
   }    
}
class Student {
   int rollNo;
   String name;

   Student(int rollNo, String name){
      this.rollNo = rollNo;
      this.name = name;
   }

   @Override
   public String toString() {
      return "[ " + this.rollNo + ", " + this.name + " ]";
   }
   @Override
   public boolean equals(Object obj) {
      if(obj == null) return false;
      Student s = (Student)obj;
      return this.rollNo == s.rollNo && this.name.equalsIgnoreCase(s.name);
   }
}

Let us compile and run the above program, this will produce the following result.

Checking value
Adam exists: true

java_util_treemap.htm

RetroSearch is an open source project built by @garambo | Open a GitHub Issue

Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo

HTML: 3.2 | Encoding: UTF-8 | Version: 0.7.4