Hash

[sandy1028]

 String name=hashm.containsKey("name")?(String)hm.get("name"):"null";

When the key exists and value doesnot exits it should return null or undefined value and execute with the next line.

But now It gives run time error and stops execution.

How to avoid it

[RamyaSivakanth]

Hashtable will not allow us to store null value.

If u want to store string a value use "" instead of null

[RamyaSivakanth]

use HashMap if u want to store null values .for 2 keys I have stored null and try to retreive as what u said.
import java.util.HashMap;


class Sample
{
public static void main(String[] args) throws Exception
{
HashMap ht = new HashMap();
ht.put("1",null);
ht.put("2","test1");
ht.put("3",null);
String name=ht.containsKey("3")?(String)ht.get("3"):"null ";
System.out.println(name);


}//main
}//Sample

[sandy1028]

This code for everything it prints null.

import java.util.HashMap;
class Sample
{
public static void main(String[] args) throws Exception
{
HashMap ht = new HashMap();
ht.put("1",null);
ht.put("2","test1");
ht.put("3",null);
String name=ht.containsKey("2")?(String)ht.get("2"):"null";
System.out.println(name);

}//main
}//Sample

I want something like ht.put("3","");
I mean after the value 3 if there is no character's and if it is a blank space
This gives run time error.

[RamyaSivakanth]

Hi ,
The above program prints the value of key " 2" as "test1" know?
Could u please tell me what is the input u are giving and what exactly ur output should be so that i can write the code for u.
-Regards
Ramya