YouTipJava Hashmap Entryset
# Java HashMap entrySet() Method
[ Java HashMap](#)
The entrySet() method returns a Set view of the mappings contained in the map.
The syntax for the entrySet() method is:
hashmap.entrySet()
**Note:** hashmap is an object of the HashMap class.
**Parameter Explanation:**
* None
### Return Value
Returns a Set view of the mappings contained in this map.
**Note:** The Set view means that all key-value pairs in the HashMap are treated as a set collection.
### Example
The following example demonstrates the use of the entrySet() method:
## Example
import java.util.HashMap;
class Main {
public static void main(String[] args){
// Create a HashMap
HashMap sites =new HashMap();
// Add some elements to the HashMap
sites.put(1, "Google");
sites.put(2, "");
sites.put(3, "Taobao");
System.out.println("sites HashMap: "+ sites);
// Return the set view of the mapping relationships
System.out.println("Set View: "+ sites.entrySet());
}
}
The output of the above program is:
sites HashMap: {1=Google, 2=, 3=Taobao}Set View: [1=Google, 2=, 3=Taobao]
The entrySet() method can be used with a for-each loop to iterate through each mapping entry in the HashMap.
## Example
import java.util.HashMap;
import java.util.Map.Entry;
class Main {
public static void main(String[] args){
// Create a HashMap
HashMap numbers =new HashMap();
numbers.put("One", 1);
numbers.put("Two", 2);
numbers.put("Three", 3);
System.out.println("HashMap: "+ numbers);
// Access each mapping entry in the HashMap
System.out.print("Entries: ");
// entrySet() returns a set view of all mapping entries in the HashMap
// The for-each loop accesses each entry in this view
for(Entry entry: numbers.entrySet()){
System.out.print(entry);
System.out.print(", ");
}
}
}
The output of the above program is:
HashMap: {One=1, Two=2, Three=3}Entries: One=1, Two=2, Three=3,
[ Java HashMap](#)