Maps

[Sherry Jacob]

Hi All,
I made this simple program for inserting elements in2 a Map and then displaying the elements of the Map :

import java.util.*;
 
public class MyClass 
{
public static void main(String[] args) 
{
String[] names = {"Iny" , "Mini" , "Miny", "Moe"};
int[] marks = {74,80,65,90};
 
Map myMap = new HashMap();

for (int i=0;i<names.length;i++)
{
myMap.put((String)names[i], (Integer)marks[i]);
}
 
System.out.println("Map elements : " + myMap);
}
}

THe program does not compile...it gives an error :

C:\java1.4\bin\MyClass.java:14: inconvertible types
found   : int
required: java.lang.Integer
myMap.put((String)names[i], (Integer)marks[i]);
                                                                  ^
1 error

Why ? The put() method takes two objects as parameters.
I have converted the primitive values to their respective Object types...still the error ??

Please help...

[Steve McCann]

Hi Sherry

You can't cast from a primitive to an Object. Try creating a new Integer rather than casting, e.g.

for (int i=0;i<names.length;i++)
{
    myMap.put((String)names[i], new Integer(marks[i]));
}

Steve
[ August 04, 2005: Message edited by: Steve McCann ]

[Sherry Jacob]

Originally posted by Steve McCann:
Hi Sherry

You can't cast from a primitive to an Object. Try creating a new Integer rather than casting, e.g.

for (int i=0;i<names.length;i++)
{
    myMap.put((String)names[i], new Integer(marks[i]));
}

Steve

[ August 04, 2005: Message edited by: Steve McCann ]

eeeeeeh....what's up doc ? Thanx abunch Steve...it worked. I made an elementary mistake !!