Scrigroup - Documente si articole

Username / Parola inexistente      

Home Documente Upload Resurse Alte limbi doc  

AccessAdobe photoshopAlgoritmiAutocadBaze de dateCC sharp
CalculatoareCorel drawDot netExcelFox proFrontpageHardware
HtmlInternetJavaLinuxMatlabMs dosPascal
PhpPower pointRetele calculatoareSqlTutorialsWebdesignWindows

AspAutocadCDot netExcelFox proHtmlJava
LinuxMathcadPhotoshopPhpSqlVisual studioWindowsXml

String operator +


+ Font mai mare | - Font mai mic


Trimite pe Messenger
String operator +
Logical operators
Applets And Graphics
Common pitfalls when using operators
Choice, Menus, And Checkboxes
JSF Fundamentals
Business Process in Seam
Comments and embedded documentation
AWT Peer Interfaces
Handling Text, Dialogs, And Lists

String operator +

There’s one special usage of an operator in Java: the + operator can be used to concatenate strings, as you’ve already seen. It seems a natural use of the + even though it doesn’t fit with the traditional way that + is used. This capability seemed like a good idea in C++, so operator overloading was added to C++ to allow the C++ programmer to add meanings to almost any operator. Unfortunately, operator overloading combined with some of the other restrictions in C++ turns out to be a fairly complicated feature for programmers to design into their classes. Although operator overloading would have been much simpler to implement in Java than it was in C++, this feature was still considered too complex, so Java programmers cannot implement their own overloaded operators as C++ programmers can.

The use of the String + has some interesting behavior. If an expression begins with a String, then all operands that follow must be Strings:

int x = 0, y = 1, z = 2;
String sString = 'x, y, z ';
System.out.println(sString + x + y + z);

Here, the Java compiler will convert x, y, and z into their String representations instead of adding them together first. However, if you say:

System.out.println(x + sString);

earlier versions of Java will signal an error. (Later versions, however, will turn x into a String.) So if you’re putting together a String (using an earlier version of Java) with addition, make sure the first element is a String (or a quoted sequence of characters, which the compiler recognizes as a String).

Politica de confidentialitate



Vizualizari: 549
Importanta: rank

Comenteaza documentul:

Te rugam sa te autentifici sau sa iti faci cont pentru a putea comenta

Creaza cont nou

Termeni si conditii de utilizare | Contact
© SCRIGROUP 2022 . All rights reserved

Distribuie URL

Adauga cod HTML in site