Question

in java

Part 1 In this section, we relook at the main method by examining passing array as parameters. Often we include options/flags when running programs. On command line, for example, we may do “java MyProgram -a -v". Depending on options, the program may do things differently. For example, "a" may do all things while "-v" display messages verbosely. You can provide options in Eclipse instead of command line: "Run ... Run Configurations ... Arguments". Create a Java class (Main.java). In the main method of your program, display all options/flags (specified in formal parameter String[] args passed to your Java program. Part 2 In this section, we practice passing by value vs. passing by reference once again. Create a Java class (ArrayPassing java) as follows: public class ArrayPassing { public static void modify(String s) { - hi- public static void modify(char()) { [0] = 'h'; (1) - ' ': public static void main(String[] args) { String 61 - "hello"; chart) 32 - {'b', 'o', 'l'. 'l'. 'O' ); modify (81); modify (52); System.out.println(81); System.out.println(52); Provide output and explain why. Run the program to verify.

Answer 1

=================================

part 2)

Output:

hello

hillo

=========================

Explanation :

In java there is only pass by value.There is no pass by reference.

But when coming to the array when we pass the array to the method , its reference to the array is getting copied.

So inside the method if there is any modfications happened to the array then that reference will get affect the original array.

================================

part 3)

// ArrayCompare.java

public class ArrayCompare {

   public static void main(String[] args) {
  
       int numbers1[]={1,2,3,7,11};
       int numbers2[]={1,2,3,7,11};
      
       System.out.println(numbers1==numbers2);
       System.out.println(equals(numbers1,numbers2));      

   }

   private static boolean equals(int[] numbers1, int[] numbers2) {
       if(numbers1.length!=numbers2.length)
       {
           return false;
       }
       else
       {
           for(int i=0;i<numbers1.length;i++)
           {
               if(numbers1[i]!=numbers2[i])
               {
                   return false;
               }
           }
       }
return true;
   }

}

=========================================

Output:

false

true

========================================

Reason:

here we are trying to compare two arrays using == operator.

As the arrays are objects we cant compare them using == operator.Even If we try to compare using == we will get false.

Because only those array references are compared. But actually we have to compare the contents of the array.

So we are creating an equal merthod here to compare two arrays corresponding contents.

=================================Thank You