Java.io.CharArrayReader.markSupported() Method

Description

The java.io.CharArrayReader.markSupported() method tests if the stream supports mark(). The char array reader supports mark() method.

Declaration

Following is the declaration for java.io.CharArrayReader.markSupported() method:

public boolean markSupported()

Parameters

• NA

Return Value

The method returns true if the stream supports mark() invocation.

Exception

• NA

Example

The following example shows the usage of java.io.CharArrayReader.markSupported() method.

package com.tutorialspoint;

import java.io.CharArrayReader;
import java.io.IOException;

public class CharArrayReaderDemo {
   public static void main(String[] args) {

      CharArrayReader car = null;
      char[] ch = {'A', 'B', 'C', 'D', 'E'};
      try{
         
         // create new character array reader
         car = new CharArrayReader(ch);
         
         // verifies if the stream support mark() method
         boolean bool = car.markSupported();
         System.out.println("Is mark supported : "+bool);
         System.out.println("Proof:");
         
         // read and print the characters from the stream
         System.out.println(car.read());
         System.out.println(car.read());
         
         // mark() is invoked at this position
         car.mark(0);
         System.out.println("Mark() is invoked");
         System.out.println(car.read());
         System.out.println(car.read());
         
         // reset() is invoked at this position
         car.reset();
         System.out.println("Reset() is invoked");
         System.out.println(car.read());
         System.out.println(car.read());
         System.out.println(car.read());
         
      }catch(IOException e){
         
         // if I/O error occurs
         e.printStackTrace();
      }finally{
         
         // releases any system resources associated with the stream
         if(car!=null)
            car.close();
      }
   }
}

Let us compile and run the above program, this will produce the following result:

Is mark supported : true
Proof:
65
66
Mark() is invoked
67
68
Reset() is invoked
67
68
69