Strings in Java:

A string is a sequence of characters. For example, a string could be used to store a person's name. In Java, strings are represented using the reference type called String.

String declaration

Strings and other reference types can be declared in the same way as primitive data types such as int and char, by stating the type and then the names of the variables. The code:

String name, address;

declares two variables of type String. No strings are created by such a declaration and the reference values in these variables have not yet been initialized.

String creation

String literals are denoted by enclosing their characters in double quotation marks. The text "David Jones" is an example of a String literal. Thus, the statements:

String name; // declare name = "David Jones"; // initialize

declare the variable name, of type String, and initialize that variable to contain a reference to the String object storing the characters "David Jones".

A special String literal is the string with no contents, called the empty string ("written"). We can write:

name = "";

Such an assignment does not (of itself) destroy the "David Jones" string or alter it; rather it creates a new string and makes our name variable reference the new string. It is possible that some other string variable could continue to reference "David Jones". Any character can appear in a String, including the escape sequences. The double quotation mark can be used as follows:

\"

This enables the programmer to write strings that contain double quotation marks, for example the string "This is a double quotation mark \"".

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