17/01/25
----------
Q)How to access the elements of an array?
  =>To access each element individually, we use array name along with
  index.
            For eg.
	    int a[]=new int[5];
	    a[0]=10;
	    a[2]=20;
	    a[3]=30;
	    a[4]=40;
	    a[5]=50;
	    System.out.println(a[0]);
	    System.out.println(a[1]);
	    System.out.println(a[2]);
	    System.out.println(a[3]);
	    System.out.println(a[4]);

=>To traverse an array we can use either enhanced for loop
or normal for loop.
Note:- Accessing each element of the array one by one is known
as traversing.

Q)Java program to initialize an integer array of 5 elements and display them.
//traversing an array with  a for loop
class ArrayExample{
	public static void main(String[] args){
		int a[]={10,20,30,40,50};
		for(int i=0;i<a.length;i++){
			System.out.println(a[i]);
		}
	}
}
                    OR

//traversing an array with  enhanced for loop(for each loop)
class ArrayExample{
	public static void main(String[] args){
		int a[]={10,20,30,40,50};
		for(int c :a){
			System.out.println(c);
		}
	}
}

Q)Java program to initialize an integer array of size 5, add the elements
and display the sum.
class ArrayExample{
	public static void main(String[] args){
		int a[]={10,20,30,40,50};
		int sum=0;
		for(int c :a){
			sum=sum+c;
		}
		System.out.println("The sum of the elements of the array is "+sum);
	}
}
Q)Java program to initialize an integer array of 5 elements, copy them into another
array.Display the elements of the second array.
class ArrayExample{
	public static void main(String[] args){
		int a[]={10,20,30,40,50};
		int b[]=new int[a.length];
		int i=0;
		for(int c:a){
                  b[i]=c;
		  i++;
		}
		System.out.println("Elements of the second array.....");
		for(int d:b){
			System.out.println(d);
		}
	}
}
                       OR
class ArrayExample{
	public static void main(String[] args){
		int a[]={10,20,30,40,50};
		int b[]=new int[a.length];
		for(int i=0;i<a.length;i++){
			b[i]=a[i];
		}
		System.out.println("Elements of the second array.....");
		for(int d:b){
			System.out.println(d);
		}
	}
}
Q)What are commandline arguments?
  =>values supplied to main method from the command line are known as
   commandline arguments.

 Note:- JVM receives the values from the commandline, constructs an array object
   with those values and then calls the main method.

Q)Write a Java program to display all the supplied command line arguments.
class CommandLineTest{
	public static void main(String []args){
            for(String ca:args){
			System.out.println(ca);
	   }
	}
}//java CommandLineTest    Java Spring  AWS

Q)Java program to add the two numbers supplied from the commandline,add them
 and display the sum.
class CommandLineTest{
	public static void main(String []args){
       int n1=Integer.parseInt(args[0]);
       int n2=Integer.parseInt(args[1]);
	   int sum=n1+n2;
	   System.out.println("The sum is "+sum);
	}
}//java CommandLineTest    10 20

                OR

class CommandLineTest{
	public static void main(String []args){
          int sum=0;
	  for(String s:args){
		  sum=sum+Integer.parseInt(s);
	  }
	  System.out.println("The sum of "+args.length+" numbers is "+sum);
	}
}//java CommandLineTest    10 20