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Question: Why the multiple inheritance is not possible in java and if possible HOW??

Answer: Let me explain with a example.

Suppose consider a method funX() which is in class Z.

Suppose a programmer ABC inherited the class Z to class X and overrided the funX().So this class will have the new implementation of funX().
Suppose a programmer DEF inherited the class Z to class Y and overrided the funX().So this class will have the new implementation of funX().

If Multiple Inheritance is permitted in java, then if the new programmer inherited both the classes and he didn't done any overriding of method funX() then if he calls the funX() ,the JVM will not know which method to call i.e., either the method in class X or method in class Y.

Because of this inconsistencies,Multiple inheritance is not permitted in java.

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Question: Why the multiple inheritance is not possible in java and if possible HOW??

Answer:

Let me explain with a example.

Suppose consider a method funX() which is in class Z.

Suppose a programmer ABC inherited the class Z to class X and overrided the funX().So this class will have the new implementation of funX().
Suppose a programmer DEF inherited the class Z to class Y and overrided the funX().So this class will have the new implementation of funX().

If Multiple Inheritance is permitted in java, then if the new programmer inherited both the classes and he didn't done any overriding of method funX() then if he calls the funX() ,the JVM will not know which method to call i.e., either the method in class X or method in class Y.

Because of this inconsistencies,Multiple inheritance is not permitted in java. Source: CoolInterview.com

Answered by: Vejai | Date: 4/27/2010 | Contact Vejai Contact Vejai

not possible using classes.
can be possible using interfaces. Source: CoolInterview.com

Answered by: anuj | Date: 5/2/2010 | Contact anuj Contact anuj

Actually, multiple inheritance is not possible in Java. This can be achieved through interface. Source: CoolInterview.com

Answered by: Naresh | Date: 5/19/2010 | Contact Naresh Contact Naresh


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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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