Hacks (no chat gpt!!)
Hack 1: (0.25) Create a void method that takes an integer input and adds it to an ArrayList. Then, add a non-void method that is able to call a certain index from the ArrayList.
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| import java.util.ArrayList;
import java.util.Scanner;
public class MyArrayList {
private ArrayList<Integer> intList = new ArrayList<>();
private Scanner scanner = new Scanner(System.in);
public void addToIntArray() {
int myInt = scanner.nextInt();
intList.add(myInt);
}
public int callInteger() {
System.out.println("Enter an index to retrieve an integer from the list:");
int index = scanner.nextInt();
System.out.println("the selected index was " + index);
if (index >= 0 && index < intList.size()) {
return intList.get(index);
}
return -1;
}
public static void main(String[] args){
MyArrayList myList = new MyArrayList();
System.out.println("Enter an integer to add to the list:");
myList.addToIntArray();
int retrievedValue = myList.callInteger();
if (retrievedValue != -1) {
System.out.println("Value at the requested index: " + retrievedValue);
} else {
System.out.println("Index is out of bounds.");
}
}
}
MyArrayList.main(null);
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| Enter an integer to add to the list:
Enter an index to retrieve an integer from the list:
the selected index was 0
Value at the requested index: 5
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Hack 2: (0.25) Create a simple guessing game with random numbers in math, except the random number is taken to a random exponent (also includes roots), and the person has to find out what the root and exponent is (with hints!). Use at least one static and one non-static method in your class.
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| import java.util.Random;
import java.util.Scanner;
public class GuessingGame {
private double randomNumber;
private double randomExponent;
private double result;
public double createRandomNumber(){
double min = 0;
double max = 10;
randomNumber = Math.floor(Math.random() *(max - min + 1) + min);
randomExponent = Math.floor(Math.random() *(max - min + 1) + min);
result = Math.pow(randomNumber, randomExponent);
//print statements i was using to make sure this thing worked
//System.out.println(randomNumber);
//System.out.println(randomExponent);
//System.out.println(randomNumber + " to the power of " + randomExponent);
//System.out.println(result);
return randomExponent;
}
public void guessingGame() {
System.out.println("Welcome to the exponent/root guessing game");
System.out.println("You need to guess the exponent/root, but don't worry there are hints!");
Scanner guess = new Scanner(System.in);
boolean correct = false;
while(!correct) {
System.out.print("Enter your guess: ");
double myGuess = guess.nextDouble();
if (myGuess == randomExponent) {
System.out.println("That is correct, good job!");
correct = true;
}
else if (myGuess > randomExponent){
System.out.println("Your guess is too high. Would you like a hint? (say yes or no)");
Scanner hint = new Scanner(System.in);
String myHint = hint.next();
if (myHint.equalsIgnoreCase("yes")){
System.out.println(randomNumber + " to the power of this random exponent is " + result);
}
}
else {
System.out.println("Your guess is too low. Would you like a hint? (say yes or no)");
Scanner hint = new Scanner(System.in);
String myHint = hint.next();
if (myHint.equalsIgnoreCase("yes")){
System.out.println(randomNumber + " to the power of this random exponent is " + result);
}
}
}
}
public static void main(String[] args) {
GuessingGame game = new GuessingGame();
game.createRandomNumber();
game.guessingGame();
}
}
GuessingGame.main(null);
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| Welcome to the exponent/root guessing game
You need to guess the exponent/root, but don't worry there are hints!
Enter your guess: Your guess is too low. Would you like a hint? (say yes or no)
2.0 to the power of this random exponent is 512.0
Enter your guess: Your guess is too low. Would you like a hint? (say yes or no)
Enter your guess: Your guess is too low. Would you like a hint? (say yes or no)
Enter your guess: That is correct, good job!
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| public class test {
public static void main(String[] args) {
double min = 0;
double max = 10;
double randomNumber = Math.floor(Math.random() *(max - min + 1) + min);
System.out.println(randomNumber);
double randomExponent = Math.floor(Math.random() *(max - min + 1) + min);
System.out.println(randomExponent);
double result = Math.pow(randomNumber, randomExponent);
System.out.println(randomNumber + " to the power of " + randomExponent);
System.out.println(result);
}
}
test.main(null);
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| 3.0
6.0
3.0 to the power of 6.0
729.0
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Hack 3: (0.25) Create a class of your choosing that has multiple parameters of different types (int, boolean, String, double) and put 5 data values in that list. Show that you can access the information by giving some samples.
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| public class Car {
private int year;
private double price;
private String brand;
public Car(int year, double price, String brand) {
this.year = year;
this.price = price;
this.brand = brand;
}
public static void main(String[] args) {
Car car1 = new Car(1969, 50000, "Mustang");
Car car2 = new Car(2000, 85000, "Tesla");
Car car3 = new Car(1935, 65000, "Ford");
Car car4 = new Car(2011, 100000, "Dodge");
Car car5 = new Car(1988, 20000, "Honda");
System.out.println(car1.year);
System.out.println(car2.brand);
System.out.println(car5.price);
}
}
Car.main(null);
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Hack 4: (0.25) Using your preliminary knowledge of loops, use a for loop to iterate through a person’s first and last name, separated by a space, and create methods to call a person’s first name and a person’s last name by iterating through the string.
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| import java.util.Scanner;
public class Name {
public String getFullName() {
Scanner fullNameScanner = new Scanner(System.in);
String name = fullNameScanner.nextLine();
return name;
}
public void firstName(String name) {
System.out.println("Your first name is: ");
int i = 0;
while (i < name.length() && name.charAt(i) != ' ') {
System.out.print(name.charAt(i));
i++;
}
System.out.println();
}
public void lastName(String name) {
System.out.println("Your last name is: ");
//stores the index of the ' ' in nameSeparator
int nameSeparator = name.lastIndexOf(' ');
// -1 means no space is found
if (nameSeparator != -1) {
// nameSeparator + 1 because I want it to print everything after the space
for (int i = nameSeparator + 1; i < name.length(); i++){
System.out.print(name.charAt(i));
}
}
System.out.println();
}
public static void main(String[] args) {
Name newName = new Name();
System.out.println("Enter your full name");
String fullName = newName.getFullName();
newName.firstName(fullName);
newName.lastName(fullName);
}
}
Name.main(null);
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| Enter your full name
Your first name is:
Vivian
Your last name is:
Ni
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