Arrays of strings

• Strings can be gathered into arrays.

• Program output: Original array: This is a test. Modified array: This was a test, too!

Strings cannot be changed

• The content of a String object in Java is immutable; once created, it cannot be changed.

• This immutability allows Java to implement strings more efficiently.

• To create a variation of a String, you need to create a new String object.

• Unused strings are automatically collected by the garbage collector.

• Although the contents of a String are immutable, reference variables can change to point to other objects.

• String substring(int initial index, in final index);

• The substring() method exemplifies immutability, returning a new String without changing the original.

• Program output:
  orgstr: Java makes the Web move.
  substr: makes the Web.

• Original string orgstr remains unchanged and substr contains the substring.