String Class in Java (Part 1)

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The String Class: (Part 1)

• The String class is under Lang package in Java. But as this package is by-default imported in Java, there is not need to write the import statement to use String in your program.
• The char type represents only one character. To represent a string of characters, we can use the data type called String. For example, the following code declares message to be a string with the value "Welcome to Java".

String message = "Welcome to Java";

• A String object is immutable: Its content cannot be changed once the string is created.

Creating Strings:

• A String is combination of one or more characters. There are three methods to create Strings:
  1. By creating object of String class:
     • Syntax:
       String object_name = new String(“any_string”);
     • For example:
       String name = new String(“Mr. Harvey Specter”);
  2. By creating a String variable or literal:
     • Syntax:
       String var_name = “Value”;
     • For example:
       String name = “Mr. Mike Ross”;
  3. From character array:
     • Syntax:
       String name = new String(Name_Of_Char_Array);
     • For example:
       char value[] = {‘a’, ‘b’, ‘c’, ‘d’, ‘e’};
       String name = new String(value);

Simple Methods of String class:

• Example: (Length)
• Example: (charAt - Part 1)
• Example: (charAt - Part 2)
• Example: (concat)
• Example: (toUpperCase)
• Example: (toLowerCase) (Opposite to toUpperCase())
• Example: (trim)

Click HERE for the Comparison Methods of String class.