Hashtable keySet Example
Hashtable class keySet method example.public Set keySet() Returns a Set view of the keys contained in this map. The set is backed by the map, so changes to the map are reflected in the set, and vice-versa.
Here is the code
/**
* @ # EntrySet.java
* A class repersenting use to EntrySet method
* of HashMap class in java.util package
* version 19 May 2008
* author Rose India
*/
import java.util.*;
public class KeySet {
public static void main(String args[]) {
Hashtable table = new Hashtable();
//Put value into the table
table.put(1, "A");
table.put(2, "B");
table.put(3, "C");
table.put(4, "D");
System.out.println("table :" + table);
//A Set view of the keys contained in this map
Set s = table.keySet();
System.out.println(s);
}
} |
Output
run-single:
table :{4=D, 3=C, 2=B, 1=A}
[4, 3, 2, 1]
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