/**

 * Auto Generated Java Class.

 */

import java.util.ArrayList;



public class Practice1 {

  

  

  public static void main(String[] args) { 

    ArrayList<Integer> animals = new ArrayList<Integer>();

    

    animals.add(4);

    animals.add(5);

    animals.add(6);

    animals.add(1, 9);

    

    for (int i = 0; i < animals.size() ; i++) {

      System.out.println("i=" + i + ":  " + animals.get(i));

    }

    

    animals.remove(1);

    for (int i = 0; i < animals.size() ; i++) {

      System.out.println("i=" + i + ":  " + animals.get(i));

    }

    

    

    System.out.println("\n\nArrays");

    String[] animals2 = new String[10];

    animals2[0] = "ant";

    animals2[1] = "cat";

    animals2[0] = null;

    for (int i = 0; i < animals2.length ; i++) {

      if (animals2[i] != null) System.out.println("i=" + i + ":  " + animals2[i]);

    }

    

    double[][] nums = new double[4][7];

    

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

      double sum = 0;

      for (int j = 0; j < nums[i].length; j++) {

        nums[i][j] = i*j;

        sum += nums[i][j];

        System.out.print(nums[i][j] + "  ");

      }

      double ave = sum/nums[i].length;

      System.out.println("sum = " + sum + " average = " + ave);  

    }

    System.out.println("\n\n");

    

    double sumAll = 0;

    for (int j = 0; j < nums[0].length; j++) {

      double sum = 0;

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

        nums[i][j] = i*j;

        sum += nums[i][j];

        sumAll += nums[i][j];

        System.out.print(nums[i][j] + "  ");

      }

      double ave = sum/nums.length;

      System.out.println("sum = " + sum + " average = " + ave);  

    }

    double aveAll = sumAll/(nums[0].length*nums.length);

    System.out.println("sumAll = " + sumAll + " aveAll = " + aveAll);  

    

    double d = doSomething("cat","bat");

  }

  

  

  public static double doSomething(String s1, String s2) {

    System.out.println( s1 + s2);

    return 4.555555;

  }

  

}