Java String Class Tutorial and Example

Java String class is represented by character strings. On this java tutorial we will be diving into details of String class. Examples are provided further for us to visualize the usage of String. Methods of this class were discussed one by one and we have also provided example source code that deals with the proper usage.

Rules in dealing with Java String Class

• values cannot be modified or altered after once they are created.
• All string literals are treated as an instance of this class

String Creation Example

System.out.println("this is a string");
String name = "anderson";
String address = new String("New York");
String newString = "sample string tutorial".substring(1,3);
String concatString = name + "|" + address.substring(2,4);

As you would have noticed we have presented various ways in creating String objects. We have used the System.out.println to print the String “this is a string”. The second example is a direct assignment of String literal “anderson” to String object name. The third one is assigning a value of String literal “New York” to object address, to shed light on assigning a value to our string using the keyword new. The fourth example assigned a value from the contents of “sample string tutorial”, from which it uses a method substring(start,end). As you can see on this example that “all literals are treated as an instance of String class. You might be wondering why would we need to create a new instance whenever we use a previously instantiated String object such as the address. This is shown on the last example that once a String object is created, values cannot be modified or altered.

String Class Method Examples

The following are the list of methods available. The method name is clickable and you will be redirected to specific method tutorial.