Common Array Algorithms

This chapter discusses how a for loop can be used to iterate over the elements of a one-dimensional array. In addition, it also discusses enhanced for loops. The chapter demonstrates the use of arrays to solve common problems such as finding sum, average, maximum, and minimum values of numbers stored in array. Pay attention to some of the common programming errors one can make while using arrays.

23. equals Method



Answer:
One Literal 
Recall that, as an optimization, only one object is made for string literals containing the same characters. So in the above, 
both variables point to the same object. The == returns true because stringG and stringH contain
identical references.






equals Method



    

    

    

        

            

        

        
Here is another touchy situation:


        

            
                

                

                

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

Output:
NOT Equal

                    		
                

            
        


    

    
The equals() method for arrays returns the same boolean value as does ==.

    




    

        

    









    
Question 23:
Are there times when you would like a method that examines two arrays (like the above two) and returns true or false depending on the elements of the array?