List Memory Popcorn Hacks


listOne[2] = 33; // Our list looks like [0, 0, 33, 0, 0]
listOne[3] = listOne[2] * 3; // Our list looks like [0, 0, 33, 99, 0]

try {
    listOne[5] = 13; // This will return an error
} catch (Exception e) {
    // System.out.println("Error at listOne[5] = 13");
    // System.out.println("ArrayIndexOutOfBoundsException: We can't access a memory index that doesn't exist!");
}

System.out.println(listOne); // THIS DOES NOT PRINT THE LIST!! It prints the value in memory
System.out.println(listOne[4]); // This will actually print the vaules in the array

System.out.print("[");
for (int i = 0; i < listOne.length; i++) {
    if (i > 0) {
        System.out.print(", ");
    }
    System.out.print(listOne[i]);
}
System.out.println("]");

Output

Refrence Elements Popcorn hacks

Use a class that you have already created and create a list of objects of that class. Then, iterate through the list and print out each object using: 1) a for loop 2) a while loop import java.util.ArrayList; import java.util.List;
public class Main {
public static void main(String[] args) {
List<Student> students = new ArrayList<>();
students.add(new Student("Alice", 20));
students.add(new Student("Bob", 21));
students.add(new Student("Charlie", 22));

    // for loop
    for (int i = 0; i < students.size(); i++) {
        System.out.println(students.get(i));
    }

    // while loop
    int i = 0;
    while (i < students.size()) {
        System.out.println(students.get(i));
        i++;
    }
}

}

Main.main(null);

 Output
![image](https://github.com/QDBordtoshred/WEni/assets/143145783/ad6fad29-27d9-4707-9960-50e738184b98)
## Enhanced For Loops Popcorn Hacks
> Create an array, then use a enhanced for loop to print out each element of the array.

/ Popcorn hacks go here /

int[] array = {1, 2, 3, 4, 5};

for (int number : array) { System.out.println(number); }

 ## Output
![image](https://github.com/QDBordtoshred/WEni/assets/143145783/7e7ee467-71e4-476f-ac7e-8f1c6731d1c3)
## Min Maxing Popcorn Hacks
> Create two lists: one of ints and one of doubles. Use both a standard for loop and an enhanced for loop to find the max and min of each list.

/ Popcorn hacks go here! / import java.util.Arrays; import java.util.List;

public class Main { public static void main(String[] args) { List intList = Arrays.asList(1, 2, 3, 4, 5); List doubleList = Arrays.asList(1.1, 2.2, 3.3, 4.4, 5.5);

    // standard for loop
    int intMax = Integer.MIN_VALUE;
    int intMin = Integer.MAX_VALUE;
    for (int i = 0; i < intList.size(); i++) {
        intMax = Math.max(intMax, intList.get(i));
        intMin = Math.min(intMin, intList.get(i));
    }
    System.out.println("Integer List - Max: " + intMax + ", Min: " + intMin);

    double doubleMax = Double.NEGATIVE_INFINITY;
    double doubleMin = Double.POSITIVE_INFINITY;
    for (int i = 0; i < doubleList.size(); i++) {
        doubleMax = Math.max(doubleMax, doubleList.get(i));
        doubleMin = Math.min(doubleMin, doubleList.get(i));
    }
    System.out.println("Double List - Max: " + doubleMax + ", Min: " + doubleMin);

    // enhanced for loop
    intMax = Integer.MIN_VALUE;
    intMin = Integer.MAX_VALUE;
    for (int num : intList) {
        intMax = Math.max(intMax, num);
        intMin = Math.min(intMin, num);
    }
    System.out.println("Integer List - Max: " + intMax + ", Min: " + intMin);

    doubleMax = Double.NEGATIVE_INFINITY;
    doubleMin = Double.POSITIVE_INFINITY;
    for (double num : doubleList) {
        doubleMax = Math.max(doubleMax, num);
        doubleMin = Math.min(doubleMin, num);
    }
    System.out.println("Double List - Max: " + doubleMax + ", Min: " + doubleMin);
}

}

Main.main(null);

## Output
![image](https://github.com/QDBordtoshred/WEni/assets/143145783/7d81dc71-c57c-43ab-af9d-e50183dcbd23)
## Hacks! (Due 10/22 11:59 PM)
Given an input of N integers, find A, the maximum, B, the minimum, and C the median.

Print the following in this order: A + B + C A - B - C (A + B) * C
Sample data:

I: 1 2 3 4 5
O: 9 1 18

I: 2 4 6 8 10 12 14 16
O: 28 6 180

import java.util.Arrays;

public class Main { public static void main(String[] args) { int[] numbers1 = {1, 2, 3, 4, 5}; int[] numbers2 = {2, 4, 6, 8, 10, 12, 14, 16};

    printResults(numbers1);
    printResults(numbers2);
}

public static void printResults(int[] numbers) {
    Arrays.sort(numbers);

    int A = numbers[numbers.length - 1]; // max
    int B = numbers[0]; // min
    int C = numbers[numbers.length / 2]; // median

    System.out.println((A + B + C) + " " + (A - B - C) + " " + ((A + B) * C));
}

}

## Output
![image](https://github.com/QDBordtoshred/WEni/assets/143145783/93101fe5-a8a8-4e67-97a7-9a726ad81f01)
## For extra, create your own fun program using an array

import java.util.Random;

public class Main { public static void main(String[] args) { String[] favoriteFoods = {"Pizza", "Burger", "Pasta", "Sushi", "Tacos", "Salad", "Steak"};

    Random rand = new Random();
    int randomIndex = rand.nextInt(favoriteFoods.length);

    System.out.println("How about having " + favoriteFoods[randomIndex] + " for dinner tonight?");
}

}

QDBordtoshred / WEni

Hacks #4

List Memory Popcorn Hacks