Time for action – using the Writable wrapper classes

Let's write a class to show some of these wrapper classes in action:

1. Create the following as WritablesTest.java:

   import org.apache.hadoop.io.* ;
   import java.util.* ;
   
   public class WritablesTest
   {
       public static class IntArrayWritable extends ArrayWritable
       {
           public IntArrayWritable()
           {
               super(IntWritable.class) ;
           }
       }
       
       public static void main(String[] args)
       {
   System.out.println("*** Primitive Writables ***") ;
           BooleanWritable bool1 = new BooleanWritable(true) ;
           ByteWritable byte1 = new ByteWritable( (byte)3) ;
           System.out.printf("Boolean:%s Byte:%d\n", bool1, byte1.get()) ;
           
           IntWritable i1 = new IntWritable(5) ;
           IntWritable i2 = new IntWritable( 17) ;
        System.out.printf("I1:%d I2:%d\n", i1.get(), i2.get()) ;
           i1.set(i2.get()) ;
           System.out.printf("I1:%d I2:%d\n", i1.get(), i2.get()) ;
           Integer i3 = new Integer...