Programmer Object File For Remote Update ManagerTop Frequently Asked Questions in. Net Interview. 1. What is the difference between an abstract class and interfaces Probably Difference Between abstract Class and Interface is the most frequent question being asked in the. Net world.   In this tutorial, I will explain the differences theoretically followed by code snippets. Theoretically there are basically 5 differences between Abstract Classes and Interfaces as listed below. A class can implement any number of interfaces but a subclass can at most use only one abstract class. An abstract class can have non abstract methods concrete methods whereas all methods of interfaces must be abstract. SQLCODES for SQL DB2 in MVS, OS390, ZOS Tutorial. View and Download TransAct Ithaca 280 programmers manual online. TransAct Ithaca 280 User Guide. Ithaca 280 Printer pdf manual download. Programmer Object File For Remote Update WindowsAn abstract class can declare or use any variables whereas an interface is not allowed to do so. The following code compiles properly since no field declaration is in the interface. Test. Interfaceint x 4   Filed Declaration in Interfacevoid get. Method string get. Name abstract class Test. Abstract. Classint i 4 int k 3 public abstract void get. Class. Name It will generate a compile time error as Error. Interfaces cannot contain fields. So we need to omit the Field Declaration to compile the code properly. Test. Interfacevoid get. Method string get. Name  abstract class Test. Abstract. Classint i 4 int k 3 public abstract void get. Class. Name An abstract class can have a constructor declaration whereas an interface cannot. So the following code will not compile interface Test. Interface Constructor Declarationpublic Test. Interfacevoid get. Method string get. Name abstract class Test. Abstract. Classpublic Test. Abstract. Classint i 4 int k 3 public abstract void get. Class. Name The code above will generate the compile time error Error 1 Interfaces cannot contain constructors  So we need to omit the constructor declaration from the interface to compile our code. The following code compiles perfectly interface Test. Interfacevoid get. Method string get. Name abstract class Test. Abstract. Classpublic Test. Abstract. Classint i 4 int k 3 public abstract void get. Lua Glider Crack Cocaine. Class. Name An abstract class is allowed to have all access modifiers for all of its member declarations whereas in an interface we cannot declare any access modifier including public since all the members of an interface are implicitly public. Note here I am talking about the access specifiers of the member of interfaces and not about the interface. The following code will explain it better. It is perfectly legal to provide an access specifier as Public remember only public is allowed. Test. Interfacevoid get. Method string get. Name The code above compiles perfectly. It is not allowed to provide any access specifier to the members of the interface. Test. Interfacepublic void get. Method public string get. Name The code above will generate the compile time error Error 1 The modifier public is not valid for this item. 32 Karat Software Installation. But the best way of declaring an interface will be to avoid access specifiers on interfaces as well as members of interfaces. Testvoid get. Method string get. Name 2. What is the difference between overriding and overloading Overloading. In this approach we can define multiple methods with the same name changing their signature. In other words different parameters. This can be performed within a class as well as within a child class. Doesnt require any permission from the parent for overloading its method in the child. Overriding. It is an approach of defining multiple methods with the same name and the same signature. This can be performed only under child classes. Requires an explicit permission from the parent to override its methods in the child. String Builder and String class String A string is a sequential collection of Unicode characters that represent text. String is a class that belongs to the namespace System. String.  String concatenation can be done using the opearator or the String. Concat method. The String. Concat method concatenates one or more instances of a String. Sample code string string. Today is   Date. Time. Now. To. String D  . Console. Write. Line string. Hi   This is Jitendra string. Sampathi. Rao. Console. Write. Linestring. String. Builder. String. Builder is a class that belongs to the namespace System. Text. This class cannot be inherited. In String. Builder we use the Append  method. Sample code. String. Builder number new String. Builder 1. 00. 00 for int i 0 ilt 1. Number. Append i. To. String So where do we use these classes The answer is for simple String manipulations we can use the String class. But when there are more string manipulations it is better to use the String. Builder class.  Why is the String. Builder class better for more string manipulations instead of the String class The String object is immutable. Every time you use one of the methods in the System. String class, you create a new string object in memory, that requires a new allocation of space for that new object. In situations where you need to perform repeated modifications to a string, the overhead associated with creating a new String object can be costly. The performance of the application might be degraded. Applied Mathematics 2 Pdf. So we use String. Builder in such cases. A String. Builder object is mutable. The System. Text. String. Builder class can be used when you want to modify a string without creating a new object. For example, using the String. Builder class can boost performance when concatenating many strings together in a loop. Differences between String and String. Builder. It belongs to String namespace. It belongs to String. Text namespace. String object is immutable. String. Builder object is mutable. Assigning String. Builder sbuild new String. Buildersomething important Assigning String s something important We can use the operator or Concat method to concatenate the strings. We use the Append method. When string concatenation is done, additional memory will be allocated. Here additional memory will only be allocated when the string buffer capacity is exceeded. What is the difference  between array and array list Mirosoft. Net has many namespaces for many purposes. Among them the System. Collections is a very important namespace in the programmers perceptive. While coding, we look for classes that can reduce manual operation. For instance if you want to sort the values in an array then you need to do the manual operations. Here obviously we look for the classes that can automate the sorting by just calling a method. In other words we can call this namespace as a utility namespace. Let us see the classes in this namespace. Collection Classes. The System. Collections namespace has many classes for the individual purpose. We will discuss the frequently used classes in this article. Array. List. Bit. Array. Stack. Queue. Comparer. Hash. Table. Sorted. List. Array. List. The Array. List is one of the important classes in the System. Collection namespace. We can say it is the next generation of the Array in C. Array. List is a dynamic array it will increase the size of the storage location as required. It stores the value as an object. The allocation of the Array. List can be done through the Trim. To. Size property. Methods. 1Add. It will add the element as object in the Array. List. 2Add. Range. It will add the collections of elements in the object as individual objects in the Array. List. 3Clear. It will clear the all objects in the Array. List. 4Binary. Search.