- Java.util Package Classes
- Java.util - Home
- Java.util - ArrayDeque
- Java.util - ArrayList
- Java.util - Arrays
- Java.util - BitSet
- Java.util - Calendar
- Java.util - Collections
- Java.util - Currency
- Java.util - Date
- Java.util - Dictionary
- Java.util - EnumMap
- Java.util - EnumSet
- Java.util - Formatter
- Java.util - GregorianCalendar
- Java.util - HashMap
- Java.util - HashSet
- Java.util - Hashtable
- Java.util - IdentityHashMap
- Java.util - LinkedHashMap
- Java.util - LinkedHashSet
- Java.util - LinkedList
- Java.util - ListResourceBundle
- Java.util - Locale
- Java.util - Observable
- Java.util - PriorityQueue
- Java.util - Properties
- Java.util - PropertyPermission
- Java.util - PropertyResourceBundle
- Java.util - Random
- Java.util - ResourceBundle
- Java.util - ResourceBundle.Control
- Java.util - Scanner
- Java.util - ServiceLoader
- Java.util - SimpleTimeZone
- Java.util - Stack
- Java.util - StringTokenizer
- Java.util - Timer
- Java.util - TimerTask
- Java.util - TimeZone
- Java.util - TreeMap
- Java.util - TreeSet
- Java.util - UUID
- Java.util - Vector
- Java.util - WeakHashMap
- Java.util Package Extras
- Java.util - Interfaces
- Java.util - Exceptions
- Java.util - Enumerations
- Java.util Useful Resources
- Java.util - Useful Resources
- Java.util - Discussion
Java LinkedHashMap entrySet() Method
Description
The Java LinkedHashMap entrySet() method returns true if this map maps one or more keys to the specified value.
Declaration
Following is the declaration for java.util.LinkedHashMap.entrySet() method
public Set<Map.Entry<K,V>> entrySet()
Parameters
NA
Return Value
The method call returns a set view of the mappings contained in this map.
Exception
NA
Getting a Set View in a LinkedHashMap of Integer, Integer Pair Example
The following example shows the usage of Java LinkedHashMap entrySet() method to get a Set view of a Map. We've created a Map object of Integer,Integer pair. Then few entries are added, map is printed. Using entrySet() method, set is retrieved and printed.
package com.tutorialspoint; import java.util.LinkedHashMap; public class LinkedHashMapDemo { public static void main(String args[]) { // create hash map LinkedHashMap<Integer,Integer> newmap = new LinkedHashMap<>(); // populate hash map newmap.put(1, 1); newmap.put(2, 2); newmap.put(3, 3); System.out.println("Initial map elements: " + newmap); System.out.println("EntrySet view: " + newmap.entrySet()); } }
Output
Let us compile and run the above program, this will produce the following result.
Initial map elements: {1=1, 2=2, 3=3} EntrySet view: [1=1, 2=2, 3=3]
Getting a Set View in a LinkedHashMap of Integer, String Pair Example
The following example shows the usage of Java LinkedHashMap entrySet() method to get a Set view of a Map. We've created a Map object of Integer,String. Then few entries are added, map is printed. Using entrySet() method, set is retrieved and printed.
package com.tutorialspoint; import java.util.LinkedHashMap; public class LinkedHashMapDemo { public static void main(String args[]) { // create hash map LinkedHashMap<Integer,String> newmap = new LinkedHashMap<>(); // populate hash map newmap.put(1, "tutorials"); newmap.put(2, "point"); newmap.put(3, "is best"); System.out.println("Initial map elements: " + newmap); System.out.println("EntrySet view: " + newmap.entrySet()); } }
Output
Let us compile and run the above program, this will produce the following result.
Initial map elements: {1=tutorials, 2=point, 3=is best} EntrySet view: [1=tutorials, 2=point, 3=is best]
Getting a Set View in a LinkedHashMap of Integer, Object Pair Example
The following example shows the usage of Java LinkedHashMap entrySet() method to get a Set view of a Map. We've created a Map object of Integer,Student. Then few entries are added, map is printed. Using entrySet() method, set is retrieved and printed.
package com.tutorialspoint; import java.util.LinkedHashMap; public class LinkedHashMapDemo { public static void main(String args[]) { // create hash map LinkedHashMap<Integer,Student> newmap = new LinkedHashMap<>(); // populate hash map newmap.put(1, new Student(1, "Julie")); newmap.put(2, new Student(2, "Robert")); newmap.put(3, new Student(3, "Adam")); System.out.println("Initial map elements: " + newmap); System.out.println("EntrySet view: " + newmap.entrySet()); } } 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 + " ]"; } }
Output
Let us compile and run the above program, this will produce the following result.
Initial map elements: {1=[ 1, Julie ], 2=[ 2, Robert ], 3=[ 3, Adam ]} EntrySet view: [1=[ 1, Julie ], 2=[ 2, Robert ], 3=[ 3, Adam ]]
To Continue Learning Please Login
Login with Google