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Interview Questions වලට Support එකක් දෙමුද ?
- Thread starter saja
- Start date
thank you වේවා 
rep +, ඉක්මනින් reply කරයි කියල හිතනවා 
rep +, ඉක්මනින් reply කරයි කියල හිතනවා වෙලාවක් ලැබුන ගමන් සප් එකක් දෙන්නං
Category : C#
Target Group : Software Engineer , Software Developer
Difference Between Constant and ReadOnly and Static
Constant and ReadOnly keyword are used to make a field constant which value cannot be modified. Static keyword is used to make members static that can be shared by all the class objects. In this article, I am going to explain the difference among these three.
Constant
Constant fields or local variables must be assigned a value at the time of declaration and after that they cannot be modified. By default constant are static, hence you cannot define a constant type as static.
1. public const int X = 10;
A const field is a compile-time constant. A constant field or local variable can be initialized with a constant expression which must be fully evaluated at compile time.
1. void Calculate(int Z)
2. {
3. const int X = 10, X1 = 50;
4. const int Y = X + X1; //no error, since its evaluated a compile time
5. const int Y1 = X + Z; //gives error, since its evaluated at run time
6. }
You can apply const keyword to built-in value types (byte, short, int, long, char, float, double, decimal, bool), enum, a string literal, or a reference type which can be assigned with a value null.
1. const MyClass obj1 = null;//no error, since its evaluated a compile time
2. const MyClass obj2 = new MyClass();//gives error, since its evaluated at run time
Constants can be marked as public, private, protected, internal, or protected internal access modifiers.
Use the const modifier when you sure that the value a field or local variable would not be changed.
ReadOnly
A readonly field can be initialized either at the time of declaration or with in the constructor of same class. Therefore, readonly fields can be used for run-time constants.
1. class MyClass
2. {
3. readonly int X = 10; // initialized at the time of declaration
4. readonly int X1;
5.
6. public MyClass(int x1)
7. {
8. X1 = x1; // initialized at run time
9. }
10. }
Explicitly, you can specify a readonly field as static since, like constant by default it is not static. Readonly keyword can be apply to value type and reference type (which initialized by using the new keyword) both. Also, delegate and event could not be readonly.
Use the readonly modifier when you want to make a field constant at run time.
Static
The static keyword is used to specify a static member, which means static members are common to all the objects and they do not tied to a specific object. This keyword can be used with classes, fields, methods, properties, operators, events, and constructors, but it cannot be used with indexers, destructors, or types other than classes.
1. class MyClass
2. {
3. static int X = 10;
4. int Y = 20;
5. public static void Show()
6. {
7. Console.WriteLine(X);
8. Console.WriteLine(Y); //error, since you can access only static members
9. }
10. }
Key points about Static keyword
1. If the static keyword is applied to a class, all the members of the class must be static.
2. Static methods can only access static members of same class. Static properties are used to get or set the value of static fields of a class.
3. Static constructor can't be parameterized. Access modifiers can not be applied on Static constructor, it is always a public default constructor which is used to initialize static fields of the class.
Target Group : Software Engineer , Software Developer
Difference Between Constant and ReadOnly and Static
Constant and ReadOnly keyword are used to make a field constant which value cannot be modified. Static keyword is used to make members static that can be shared by all the class objects. In this article, I am going to explain the difference among these three.
Constant
Constant fields or local variables must be assigned a value at the time of declaration and after that they cannot be modified. By default constant are static, hence you cannot define a constant type as static.
1. public const int X = 10;
A const field is a compile-time constant. A constant field or local variable can be initialized with a constant expression which must be fully evaluated at compile time.
1. void Calculate(int Z)
2. {
3. const int X = 10, X1 = 50;
4. const int Y = X + X1; //no error, since its evaluated a compile time
5. const int Y1 = X + Z; //gives error, since its evaluated at run time
6. }
You can apply const keyword to built-in value types (byte, short, int, long, char, float, double, decimal, bool), enum, a string literal, or a reference type which can be assigned with a value null.
1. const MyClass obj1 = null;//no error, since its evaluated a compile time
2. const MyClass obj2 = new MyClass();//gives error, since its evaluated at run time
Constants can be marked as public, private, protected, internal, or protected internal access modifiers.
Use the const modifier when you sure that the value a field or local variable would not be changed.
ReadOnly
A readonly field can be initialized either at the time of declaration or with in the constructor of same class. Therefore, readonly fields can be used for run-time constants.
1. class MyClass
2. {
3. readonly int X = 10; // initialized at the time of declaration
4. readonly int X1;
5.
6. public MyClass(int x1)
7. {
8. X1 = x1; // initialized at run time
9. }
10. }
Explicitly, you can specify a readonly field as static since, like constant by default it is not static. Readonly keyword can be apply to value type and reference type (which initialized by using the new keyword) both. Also, delegate and event could not be readonly.
Use the readonly modifier when you want to make a field constant at run time.
Static
The static keyword is used to specify a static member, which means static members are common to all the objects and they do not tied to a specific object. This keyword can be used with classes, fields, methods, properties, operators, events, and constructors, but it cannot be used with indexers, destructors, or types other than classes.
1. class MyClass
2. {
3. static int X = 10;
4. int Y = 20;
5. public static void Show()
6. {
7. Console.WriteLine(X);
8. Console.WriteLine(Y); //error, since you can access only static members
9. }
10. }
Key points about Static keyword
1. If the static keyword is applied to a class, all the members of the class must be static.
2. Static methods can only access static members of same class. Static properties are used to get or set the value of static fields of a class.
3. Static constructor can't be parameterized. Access modifiers can not be applied on Static constructor, it is always a public default constructor which is used to initialize static fields of the class.
Category : C#
Target Group : Software Engineer , Software Developer
Pass by reference and Pass by value
static void Main(string[] args)
{
int num1 = 5;
int num2 = 10;
Console.WriteLine(num1 + " " + num2);
Square(num1, num2);
Console.WriteLine(num1 + " " + num2);
Console.Read();
}
static void Square(int a, int b)
{
a = a * a;
b = b * b;
Console.WriteLine(a + " " + b);
}
The output on console would look like this:
5 10
25 100
5 10
static void Main(string[] args)
{
int num1 = 5;
int num2 = 10;
Console.WriteLine(num1 + " " + num2);
Square(ref num1, ref num2);
Console.WriteLine(num1 + " " + num2);
Console.Read();
}
static void Square(ref int a, ref int b)
{
a = a * a;
b = b * b;
Console.WriteLine(a + " " + b);
}
The output on console would look like this:
5 10
25 100
25 100
Target Group : Software Engineer , Software Developer
Pass by reference and Pass by value
static void Main(string[] args)
{
int num1 = 5;
int num2 = 10;
Console.WriteLine(num1 + " " + num2);
Square(num1, num2);
Console.WriteLine(num1 + " " + num2);
Console.Read();
}
static void Square(int a, int b)
{
a = a * a;
b = b * b;
Console.WriteLine(a + " " + b);
}
The output on console would look like this:
5 10
25 100
5 10
static void Main(string[] args)
{
int num1 = 5;
int num2 = 10;
Console.WriteLine(num1 + " " + num2);
Square(ref num1, ref num2);
Console.WriteLine(num1 + " " + num2);
Console.Read();
}
static void Square(ref int a, ref int b)
{
a = a * a;
b = b * b;
Console.WriteLine(a + " " + b);
}
The output on console would look like this:
5 10
25 100
25 100
බම්ප් එකක් තමයි දෙන්න වෙන්නේ. මම ඉන්ටර්වීව් වලට ගිහිල්ලා නැති නිසා අහන ප්රශ්න දන්නේ නෑ. දෙක තුනකට ගියා.ඒවල ඉතින් ඇහුවේ කොහොමද එච්චර දුර ඉදන් එන්නේ? මෙහෙ කොහෙ හරි තැනක බෝර්ඩ් වෙලද ඉන්නේ? සැලරි එක කීයක් බලාපොරොත්තු වෙනවාද? කලින් කොහෙද වැඩ කලේ? ඇයි එතනින් අස් උනේ වගේ ඒවා තමයි විශයානුබද්ධ මොකුත් ඇහුවේ නෑ.
Category : Java
Target Group : Software Engineer , Software Developer
thank you වේවා
මම නම් Java කරන්නේ නැ, එත් කරන අයට වටිනවා
Target Group : Software Engineer , Software Developer
thank you වේවා
මම නම් Java කරන්නේ නැ, එත් කරන අයට වටිනවා
හෙනයා;22500256 said:
කමක් නැ තම තමන්ට පුළුවන් විදිහට , thread එකට අදාලව support කරානේ ,thank you
HR වලට අදාල ප්රශ්නත් දාමු
HR වලට අදාල ප්රශ්නත් දාමු
හරිම කණගාටුයි
interview question එකක්ම නවෙයි , හැබැයි ....
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