Fill the insertCommas method to recursively construct and return a string representation of the parameter num, including commas for every third decimal place. Ex. 157992546 >>>>> 157,992,546   import java.util.*; public class NumbersWithCommas{ public static String insertCommas(int num){   } public static void main(String[] args){ int numTests =(int)(Math.random() * 6) + 5; for (int i = 0; i < numTests; i++){ int num = (int)(Math.random() * Integer.MAX_VALUE); System.out.println(num + " >>>>> " + insertCommas(num)); } System.out.println(1000000 + " >>>>> " + insertCommas(1000000)); System.out.println(1001020 + " >>>>> " + insertCommas(1001020)); System.out.println(561010002 + " >>>>> " + insertCommas(561010002)); } }

preLabC.java 1 import java.util.Random; 2 import java.util.StringJoiner; 3 4- public class preLabC { 5 6- 7 8 9 10 11 12 13 14 15 16 17 18 19 20 } public static String myMethod(MathVector inputVector) { String vectorStringValue = new String(); // empty String object System.out.println("here is the contents object, inputVector: + inputVector); // get a String out of that MathVector object. Do it here. On the next line. // return the double value here. return vectorStringValue; "1 ▸ Compilation Description A MathVector object will be passed to your method. Return its contents as a String. If you look in the file MathVector.java you'll see there is a way to output the contents of a MathVector object as a String. This makes it useful for displaying to the user. /** * Returns a String representation of this vector. The String should be in the format "[1, 2, 3]" * * @return a String representation of this vector * @apiNote **DO NOT** use the built-in (@code Arrays.toString()} method. */…

public class arrayOutput ( public static void main (String [] args) { final int NUM ELEMENTS = 3; int[] userVals = new int [NUM_ELEMENTS]; int i; } Type the program's output userVals [0] = 2; userVals [1] = 6; userVals [2] = 8; for (i = userVals.length - 1; i >= 0; −−1) { System.out.println(userVals [1]); } C.C. ? ? ??

in java Describe the definition of recursive function. oBase case(s)oRecursive case(s)2. Write the code part of code below      public class ReverseArray { public static void main(String[] args) {   // TODO Auto-generated method stub public static void reverseArray(int[] data,int low, int high ) { if(low < high) { int temp = data[low]; data[low] = data[high]; data[high] = temp; reverseArray(data, low + 1, high -1); } }

Write a statement that calls the recursive method backwardsAlphabet() with parameter starting Letter. 789GHA 10 11 12 13 } TENN 14 15 16 17 18 19 20 21 22 } 23 } } else { } System.out.print(currLetter + "); backwardsAlphabet((char) (currLetter - 1)); public static void main (String[] args) { Scanner scnr = new Scanner(System.in); char startingLetter; startingLetter = scnr.next().charAt(0); /* Your solution goes here */ ▶

import java.util.* ; public class Averager {     public static void main(String[] args)     {     //a two dimensional array     int[][] a = {{5, 9, 3, 2, 14}, {77, 44, 22, 15, 99},                  {14, 2, 3, 9, 5}, {88, 15, 17, 121, 33}} ;     System.out.printf("Average = %.2f\n", average(a)) ;     System.out.println("EXPECTED:") ;     System.out.println("Average = 29.85") ;     System.out.printf("Average of evens = %.2f\n", averageEvens(a)) ;     System.out.println("EXPECTED:") ;     System.out.println("Average of evens = 26.57") ;     Random random = new Random(1) ;     a = new int[100][1] ;     for (int i = 0 ; i < 100 ; i++)         a[i][0] = random.nextInt(1000) ;     System.out.println("For an array of random values in range 0 to 999:") ;     System.out.printf("Average = %.2f\n", average(a)) ;     System.out.printf("Average of evens = %.2f\n", averageEvens(a)) ;     }     /**        Find the average of all elements of a two-dimensional array        @param aa the two…