`Array.equals()`

The class Arrays contains static methods for manipulating arrays. Since the methods are static, you invoke them using the class name. Here is the example, this time using one of these methods:

Oracle Documentation for Arrays

import java.util.Arrays;   // Import the package

class ArrayEquality
{
  public static void main ( String[] args )
  {
    int[] arrayE = { 1, 2, 3, 4 };
    int[] arrayF = { 1, 2, 3, 4 };
    
    // Invoke the methods thru the class name
    if ( Arrays.equals( arrayE, arrayF ) )   
      System.out.println( "Equal" );
    else
      System.out.println( "NOT Equal" );      
  }
}

Output:
Equal

For this method, two arrays are equal if they are the same length, and contain the same elements in the same order. Both arrays must be of the same type.

QUESTION 24:

A. What does this fragment output?

int[] arrayE = { 1, 2, 3, 4, 5 };
int[] arrayF = { 1, 2, 3, 4 };

if ( Arrays.equals( arrayE, arrayF ) )  
  System.out.println( "Equal" );
else
  System.out.println( "NOT Equal" );

B. What does this fragment output?

int[] arrayE = { 4, 3, 2, 1 };
int[] arrayF = { 1, 2, 3, 4 };

if ( Arrays.equals( arrayE, arrayF ) )  
  System.out.println( "Equal" );
else
  System.out.println( "NOT Equal" );

C. What does this fragment output?

int[] arrayE = { 4, 3, 2, 1 };
 

if ( Arrays.equals( arrayE, arrayE ) )  
  System.out.println( "Equal" );
else
  System.out.println( "NOT Equal" );

Answer:

Array.equals()

QUESTION 24:

`Array.equals()`