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Question: How could create list which can contain super class and all of its sub class?

Answer: By using generics
List<Object> collection = new ArrayList<Object>();

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Question: How could create list which can contain super class and all of its sub class?

Answer:

By using generics
List<Object> collection = new ArrayList<Object>(); Source: CoolInterview.com

Answered by: Hassan | Date: 6/24/2010 | Contact Hassan Contact Hassan


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I need your help to answer the code shown below.

using System;
using System.Collections.Generic;
using System.Text;
using System.Collections;

namespace ApplicantTestin
{
/// The DataObject class stored with a key
class DataObject
{
// Populate
}

class Program
{
static Hashtable Data = new Hashtable();
static string[] StaticData = new string[] { "X-Ray","Echo","Alpha", "Yankee","Bravo", "Charlie",
"Delta", "Hotel", "India", "Juliet", "Foxtrot","Sierra",
"Mike","Kilo", "Lima", "November", "Oscar", "Papa", "Qubec",
"Romeo", "Tango","Golf", "Uniform", "Victor", "Whisky",
"Zulu"};

static void Main(string[] args)
{
for(int i=0;i<StaticData.Length; i++)
Data.Add(StaticData[i].ToLower(), new DataObject(StaticData[i]) );
while(true)
{
PrintSortedData();
Console.WriteLine();
Console.Write("> ");
string str = Console.ReadLine();
string[] strs = str.Split(' ');

if(strs[0]=="q")
break;
else if(strs[0]=="printv")
PrintSortedDataByValue();
else if(strs[0]=="print")
PrintSortedData();
else if(strs[0]=="inc")
Increase(strs[1]);
else if(strs[0]=="dec")
Decrease(strs[1]);
else if(strs[0] == "swap")
Swap(strs[1], strs[2]);
else if (strs[0] == "ref")
Ref(strs[1], strs[2]);
else if (strs[0] == "unref")
UnRef(strs[1]);
}
}

/// <summary>
/// Create a reference from one data object to another.
/// </summary>
/// <param name="key1">The object to create the reference on</param>
/// <param name="key2">The reference object</param>
static void Ref(string key1, string key2)
{
// Populate
}

/// <summary>
/// Removes an object reference on the object specified.
/// </summary>
/// <param name="key">The object to remove the reference from</param>
static void UnRef(string key)
{
// Populate
}

/// <summary>
/// Swap the data objects stored in the keys specified
/// </summary>
static void Swap(string key1, string key2)
{
// Populate

}

/// <summary>
/// Decrease the Value field by 1 of the
/// data object stored with the key specified
/// </summary>
static void Decrease(string key)
{
// Populate
}

/// <summary>
/// Increase the Value field by 1 of the
/// data object stored with the key specified
/// </summary>
static void Increase(string key)
{
// Populate
}


/// <summary>
/// Prints the information in the Data hashtable to the console.
/// Output should be sorted by key
/// References should be printed between '<' and '>'
/// The output should look like the following :
///
///
/// Alpha...... -3
/// Bravo...... 2
/// Charlie.... <Zulu>
/// Delta...... 1
/// Echo....... <Alpha>
/// --etc---
///
/// </summary>
static void PrintSortedData()
{
// Populate
}


/// <summary>
/// Prints the information in the Data hashtable to the console.
/// Output should be sorted by stored value
/// References should be printed between '<' and '>'
/// Sorting order start from max to min, larger value takes priority.
/// The output should look like the following :
///
///
/// Bravo...... 100
/// Echo...... 99
/// Zulu...... 98
/// Charlie.... <Zulu>
/// Delta...... 34
/// Echo....... 33
/// Alpha...... <Echo>
/// --etc---
///
/// </summary>
static void PrintSortedDataByValue()
{
// Populate
}
}
}
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}
System.out.println("completed");
}
and when run produces:
Starting itrs= 100
iteration: 1
iteration: 2
iteration: 3
iteration: 4
iteration: 5
Give at least one reason why this is happening
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