By: Riktesh Srivastava in Java Tutorials on 2008-03-24
CharSequence interface in Java is used to represent a sequence of characters. It is defined in the
java.lang package and is implemented by several classes, including
CharSequence interface defines the following methods:
charAt(int index): returns the character at the specified index in the sequence.
length(): returns the length of the sequence.
subSequence(int start, int end): returns a new
CharSequencethat is a subsequence of the original sequence, starting at the specified start index and ending at the specified end index.
toString(): returns the sequence as a
Here is an example of using the
CharSequence interface with a
StringBuilder sb = new StringBuilder("Hello, World!"); CharSequence cs = sb; System.out.println(cs.charAt(0)); // prints 'H' System.out.println(cs.length()); // prints 13 System.out.println(cs.subSequence(0, 5)); // prints 'Hello' System.out.println(cs.toString()); // prints 'Hello, World!'
In the example above, we create a
StringBuilder object with the initial value of "Hello, World!". We then assign the
StringBuilder object to a
CharSequence variable named
cs. We can then use the
CharSequence methods to access the characters in the sequence, get the length of the sequence, get a subsequence of the sequence, and get the sequence as a
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