Strings

Strings

• The String class is one of the most important data types in Java.

• Unlike other languages, in Java, strings are objects, not arrays of characters.

• When you create a string literal, you are creating an object of the String class.

• Example: in System.out.println("In Java, strings are objects.");, the string is automatically converted into a String object.

• The use of String was already present from the beginning, even if implicitly.

• The String class is extensive and the text examines it superficially.

• Exploring the String class on your own is recommended.

Building strings

• A String object can be created using new and calling the String constructor.

• Example:

• String str = new String("Hello");

• creates a String object with the value "Hello".

• A String can also be created from another String.

• Example:

• String str2 = new String(str);

• creates a copy of the original String.

• Another way to create a String is by directly assigning a sequence of characters.

• Example:

• String str = "Java strings are powerful.";

• String objects can be used wherever quoted strings are allowed.
  

• Output:
  Java strings are objects.
  They are constructed various ways.
  They are constructed various ways.

Operating with strings

• Examples of methods that operate with strings:

• Output:
  Length of str1: 45
  When it comes to Web programming, Java is #1.
  str1 equals str2
  str1 does not equal str3
  str1 is greater than str3
  Index of first occurrence of One: 0
  Index of last occurrence of One: 14

• To concatenate (join) two strings using the + operator :
  String str1 = "One";
  String str2 = "Two";
  String str3 = "Three";
  String str4 = str1 + str2 + str3;

• Initialize str4 with the string “OneTwoThree”.

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