JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Program: How to get entry set from Hashtable?


Description:

Below example shows how to get key-value pair as Entry object. Entry object provides getter methods to access key-value objects. entrySet() method returns Set object with Entry values.


Code:
package com.java2novice.hashtable;

import java.util.Hashtable;
import java.util.Set;
import java.util.Map.Entry;

public class MyHashtableEntrySet {

	public static void main(String a[]){
		Hashtable<String, String> hm = new Hashtable<String, String>();
		//add key-value pair to Hashtable
		hm.put("first", "FIRST INSERTED");
		hm.put("second", "SECOND INSERTED");
		hm.put("third","THIRD INSERTED");
		System.out.println(hm);
		//getting value for the given key from Hashtable
		Set<Entry<String, String>> entires = hm.entrySet();
		for(Entry<String,String> ent:entires){
			System.out.println(ent.getKey()+" ==> "+ent.getValue());
		}
	}
}

Output:
{third=THIRD INSERTED, second=SECOND INSERTED, first=FIRST INSERTED}
third ==> THIRD INSERTED
second ==> SECOND INSERTED
first ==> FIRST INSERTED
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List Of All Hashtable Sample Programs:

  1. Basic Hashtable Operations.
  2. How to iterate through Hashtable?
  3. How to copy Map content to another Hashtable?
  4. How to search a key in Hashtable?
  5. How to search a value in Hashtable?
  6. How to get all keys from Hashtable?
  7. How to get entry set from Hashtable?
  8. How to delete all elements from Hashtable?
  9. How to read elements using Enumeration in Hashtable?
  10. Hashtable implementation with equals and hashcode example.
  11. How to fetch values with user define object as keys in Hashtable?
  12. How to eliminate duplicate keys (user defined objects) with Hashtable?
Knowledge Centre
What is servlet context?
The servlet context is an interface which helps to communicate with other servlets. It contains information about the Web application and container. It is kind of application environment. Using the context, a servlet can obtain URL references to resources, and store attributes that other servlets in the context can use.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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