what is java string

Java string is the string class, and all string literals (such as "abc") in Java programs are implemented as instances of this class. Strings are constants; their values ​​cannot be changed after they are created. String buffers support mutable strings. Because String objects are immutable, they can be shared.

Create a string

The simplest way to create a string is as follows: (Recommended learning: java course )

String greeting = "java入门教程";

When you encounter a string constant in the code, the value here is "Rookie Tutorial", and the compiler will use this value to create a String Object.

Like other objects, you can use keywords and construction methods to create String objects.

The String class has 11 construction methods, which provide different parameters to initialize the string. For example, provide a character array parameter:

StringDemo.java file code:

public class StringDemo{
   public static void main(String args[]){
      char[] helloArray = { 'r', 'u', 'n', 'o', 'o', 'b'};
      String helloString = new String(helloArray);  
      System.out.println( helloString );
   }

The compilation and running results of the above example are as follows:

runoob

Note: String class It is immutable, so once you create a String object, its value cannot be changed (see the notes section for details).

If you need to make a lot of modifications to the string, you should choose to use StringBuffer & StringBuilder class.

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