// Fig. 7.22: ArrayManipulations.java
// Arrays class methods and System.arraycopy.
import java.util.Arrays;

public class ArrayManipulations 
{
   public static void main( String[] args )
   {
      // sort doubleArray into ascending order
      double[] doubleArray = { 8.4, 9.3, 0.2, 7.9, 3.4 };
      Arrays.sort( doubleArray ); 
      System.out.printf( "\ndoubleArray: " );

      for ( double value : doubleArray )
         System.out.printf( "%.1f ", value );

      // fill 10-element array with 7s
      int[] filledIntArray = new int[ 10 ]; 
      Arrays.fill( filledIntArray, 7 ); 
      displayArray( filledIntArray, "filledIntArray" );

      // copy array intArray into array intArrayCopy
      int[] intArray = { 1, 2, 3, 4, 5, 6 };
      int[] intArrayCopy = new int[ intArray.length ];
      System.arraycopy( intArray, 0, intArrayCopy, 0, intArray.length );
      displayArray( intArray, "intArray" );
      displayArray( intArrayCopy, "intArrayCopy" );

      // compare intArray and intArrayCopy for equality
      boolean b = Arrays.equals( intArray, intArrayCopy );
      System.out.printf( "\n\nintArray %s intArrayCopy\n",
         ( b ? "==" : "!=" ) );

      // compare intArray and filledIntArray for equality
      b = Arrays.equals( intArray, filledIntArray );
      System.out.printf( "intArray %s filledIntArray\n", 
         ( b ? "==" : "!=" ) );

      // search intArray for the value 5
      int location = Arrays.binarySearch( intArray, 5 ); 
      
      if ( location >= 0 )
         System.out.printf( 
            "Found 5 at element %d in intArray\n", location ); 
      else
         System.out.println( "5 not found in intArray" ); 

      // search intArray for the value 8763
      location = Arrays.binarySearch( intArray, 8763 );

      if ( location >= 0 )
         System.out.printf( 
            "Found 8763 at element %d in intArray\n", location ); 
      else
         System.out.println( "8763 not found in intArray" ); 
   } // end main

   // output values in each array
   public static void displayArray( int[] array, String description )
   {     
      System.out.printf( "\n%s: ", description );

      for ( int value : array )
         System.out.printf( "%d ", value );
   } // end method displayArray
} // end class ArrayManipulations

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