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String Concatenation (Java and C# Cross Reference Guide)

By Mike Prestwood

Java versus C#: A side by side comparison between Java and C#.

 
Operators
 

A language symbol used for assignment, comparison, computational, or as a logical.

String Concatenation

[Other Languages] 
Java:  "String Concatenation" + or append

In Java, you use either the String concatenation + operator or StringBulder class methods such as append. Since Java compilers frequently create intermediate objects when the + operator is used and don't when StringBuilder.append is used, the append method is faster than the + operator.

In general, use the convenience of a + operator when speed is not an issue. For example, when concatenating a small number of items and when code isn't executed very frequently. A decent rule of thumb is to use the + operator for general purpose programming and then optimize the + operator with StringBuilder.append as needed.

Syntax Example:

Simple + operator example:

System.out.println("Hello" + " " + "Mike.");

 

Using StringBuilder example:

StringBuilder myMsg = new StringBuilder();

myMsg.append("Hello ");
myMsg.append("Mike.");
 
System.out.println(myMsg);
C#:  "String Concatenation" +

C# performs implicit casting of numbers to strings. To concatenate two strings, a string to an integer, or a string to a floating point number, use the + operator. For example, to convert a floating point number to a string just concatenate an empty string to the number as in "" + 3.2.

Alternatively, you can use the System.Text.StringBuilder class which frequently but not always provides faster code.

Syntax Example:
String FirstName;
String LastName;
Int16 Age;
FirstName = "Mike";
LastName = "Prestwood";
Age = 43;
Console.WriteLine(FirstName + " " + LastName + " is " + Age + ".");
  
//Implicit casting of numbers.
//
//This fails:
//MessageBox.Show(3.3);
//
//This works:
MessageBox.Show("" + 3.3); 












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