Java complete the main method what is the print of the main

Java

complete the main method
  
what is the print of the main method? Explain.
  
public class Number
{   
private int m = 0;   
public void setNumber(int newM)
{
m = newM;
}
public int getNumber()
{   
return m;
}

public static int increment(int x)
{
x = x+1;
}
public static int increment(int[] x)
{
for (int i =0; i< x.length;i++)
{
x[i]++;
}
}

public static void main(String[] args)
{
int[] ages = new int[20]

// initialize the ages with random numbers between 17 and 20
for (int i = 0; i < 20; i++)
{
ages [i] = 17 + (int)(Math.random() *20)
}
  
// invoke the static increment method with parameter ages

// invoke the static increment method with parameter ages[3]
  
  
// printout ages[3]
}

Solution

public class Number

{

   private int m = 0;

   public void setNumber(int newM)

   {

       m = newM;

   }

   public int getNumber()

   {

       return m;

   }

   public static void increment(int x)

   {

       x = x+1;

   }

   public static void increment(int[] x)

   {

       for (int i =0; i< x.length;i++)

       {

           x[i]++;

       }

   }

   public static void main(String[] args)

   {

       int[] ages = new int[20];

       // initialize the ages with random numbers between 17 and 20

       for (int i = 0; i < 20; i++)

       {

           ages [i] = 17 + (int)(Math.random() *20);

       }

       System.out.println(\"printing ages before any increase: \");

       for(int i=0; i<20; i++)

           System.out.print(ages[i]+\" \");

       System.out.println();

       // invoke the static increment method with parameter ages

       increment(ages);

      

       // printing after incrementing all age

       System.out.println(\"\ After increasing all ages: \");

       for(int i=0; i<20; i++)

           System.out.print(ages[i]+\" \");

       System.out.println();

       // invoke the static increment method with parameter ages[3]

       increment(ages[3]);

       // printout ages[3]

       System.out.println(\"\ After calling increase ages[3]: \");

       System.out.println(ages[3]);

      

   }

}

/*

Sample run:

printing ages before any increase:

30 31 20 25 19 24 34 28 29 18 35 19 26 30 30 20 25 35 26 30

After increasing all ages:

31 32 21 26 20 25 35 29 30 19 36 20 27 31 31 21 26 36 27 31

After calling increase ages[3]:

26

In first increase call: increase(ages[]) : the reference of ages array is passed to method, so if we

change in any object of ages[] array, if can be also notified in main method

But in call: increase(age) : value of age[3] is passed, so any change in increase method does not

reflect outside the increase method

*/