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Why does the array "prevScore" not print the value "points"?
I want it to print out points for prevScore [0], and then null 0
This is the array, after the // is something I thought I could use.
int [] prevScore = new int[10]; //{ 0 };
String [] prevScoreName = new String[10]; //{"John Doe"};
public static int[] scoreChange (int prevScore[], int points)
{
for(int i = 9; i > 0; i--){
prevScore[i] = prevScore[i-1];
}
prevScore[0]= points;
return prevScore;
}
I dont know if the print of prevScore is needed.
//a method that prints high scores
public static void printScores (int prevScore[], String prevScoreName[])
{
for (int i = 10; i > 0; i--){
System.out.println(prevScore[i] + " " + prevScoreName[i]);
}
}
Here is the rest of my program I am working on... currently only i get one, 0 John Doe.
public class Main
{
static BufferedReader br = new BufferedReader (new InputStreamReader (System.in)); // user input
public static void main (String args[]) throws IOException
{
int press = 0;
do {
int menuchoice = 0;
int [] prevScore = new int[] { 0 };
String [] prevScoreName = new String[] {"John Doe"};
System.out.println("Menu choice: 1 to start game, 2 print instructions,"
+ "3 prev score");
Scanner input = new Scanner(System.in);
int userinput = Integer.parseInt(input.next());
int points;
menuchoice = userinput;
if (menuchoice == 1){
points = startGame();
String newName = endGame(points);
prevScore = scoreChange(prevScore,points);
prevScoreName = nameChange(prevScoreName, newName);
}
if (menuchoice == 2){
printInstructions();
}
if(menuchoice == 3) {
printScores(prevScore, prevScoreName); }
if (menuchoice != 1 && menuchoice != 2 && menuchoice !=3 ) {
System.out.println("ERROR"); }
} while (press !=4 );
}
//a method that initializes a new game
public static int startGame () throws IOException //a method that initializes a new game
{
int lives = 3;
int points = 0;
System.out.println("Good Luck!");
do {
System.out.println("Points: " + points);
System.out.println("Lives: " + lives);
int correct = displayNewQuestion();
Scanner userinput = new Scanner(System.in);
int userAnswer = Integer.parseInt(userinput.nextLine());
if (userAnswer == correct){
points ++;
System.out.println("Correct");
}
if (userAnswer != correct ){
lives --;
System.out.println("Incorrect");
}
} while (lives > 0);
return points;
}
public static String endGame (int points) throws IOException // a method that tells the user the game is over
{
System.out.println("GAME OVER");
Scanner nameinput = new Scanner(System.in);
System.out.println("Please enter your name for the score charts!");
String newName = nameinput.next();
return newName;
}
public static int[] scoreChange (int prevScore[], int points)
{
// for(int i = 0; i < 10; i--){
// prevScore[i] = prevScore[i-1];
// }
// prevScore[1]= prevScore[0];
prevScore[0]= points;
return prevScore;
}
public static String[] nameChange (String prevScoreName[], String newName)
{
/*for(int i = 0; i < 10; i++){
prevScoreName[i] = prevScoreName[i-1];
}
//prevScoreName[1] = prevScoreName[0];*/
prevScoreName[0] = newName;
return prevScoreName;
}
public static void printInstructions () //a method that will print the instructions to the user
{
System.out.println("Instructions");
}
public static void printScores (int prevScore[], String prevScoreName[]) //a method that prints high scores
{
/* for (int i = 0; i < 10; i--){
System.out.println(prevScore[i] + " " + prevScoreName[i]);
}*/
for (int i = prevScore.length; i > 0; i--){
System.out.println(prevScore[i-1] + " " + prevScoreName[i-1]);
}
}
public static int displayNewQuestion () // a method that displays a random arithmetic question
{
int correctAnswer = 0;
int num1 = randInt (12,-12);
int num2 = randInt(12, -12);
Random rand = new Random();
int operator = rand.nextInt((4 - 1) + 1) + 1;
if (operator == 1)
{
System.out.println(num1 + " + " + num2);
correctAnswer = num1 + num2;
}
if (operator == 2)
{
System.out.println(num1 + " - " + num2);
correctAnswer= num1 - num2;
}
if (operator == 3)
{
System.out.println(num1 + " x " + num2);
correctAnswer= num1*num2;
}
if (operator == 4)
{
if (num2 == 0) {
System.out.println(num1*num2 + " / " + num1);
correctAnswer= ((num1*num2)/num1);
}
if (num2 != 0) {
System.out.println(num1*num2 + " / " + num2);
correctAnswer= ((num1*num2)/num2);
}
}
return correctAnswer;
}
public static int randInt(int max , int min) {
Random rand = new Random();
min = -12;
max = 12;
int randnum = rand.nextInt((max - min) + 1) + min;
return randnum;
}
}
Use this loop:
for (int i = prevScore.length; i > 0; i--){
System.out.println(prevScore[i-1] + " " + prevScoreName[i-1]);
}
I think it should solve your problem.
Update
based on your updated program. Move the following code above the start of the 'do' loop.
int [] prevScore = new int[] { 0 };
String [] prevScoreName = new String[] {"John Doe"};
That is you are moving these lines out of the loop. It should work now.
That is the start of your 'main' method should look something like this:
public static void main(String args[]) throws IOException {
int press = 0;
int[] prevScore = new int[] { 0 };
String[] prevScoreName = new String[] { "John Doe" };
do {
int menuchoice = 0;
System.out.println("Menu choice: 1 to start game, 2 print instructions," + "3 prev score");
Your printScore() method is trying to access element [10] of an array whose index range is 0 - 9, and is never accessing element [0]. You may want to print the most recent score first:
for (int i = 0; i < 10; i++) {
Or conversely, to print the most recent score last:
for (int i = 9; i >= 0; i--) {
Thank you so much! It Works! The only problem still is that the scorelist prints backwards.
public class Main
{
static BufferedReader br = new BufferedReader (new InputStreamReader (System.in)); // user input
public static void main (String args[]) throws IOException
{
int press = 0;
int[] prevScore = new int[10];
String[] prevScoreName = new String[10];
do {
int menuchoice = 0;
System.out.println("Menu choice: 1 to start game, 2 print instructions,"
+ "3 prev score");
Scanner input = new Scanner(System.in);
int userinput = Integer.parseInt(input.next());
int points;
menuchoice = userinput;
if (menuchoice == 1) {
points = startGame();
String newName = endGame(points);
prevScore = scoreChange(prevScore,points);
prevScoreName = nameChange(prevScoreName, newName);
}
if (menuchoice == 2) {
printInstructions();
}
if(menuchoice == 3) {
printScores(prevScore, prevScoreName);
}
if (menuchoice != 1 && menuchoice != 2 && menuchoice !=3 ) {
System.out.println("ERROR");
}
} while (press !=4 );
}
//a method that initializes a new game
public static int startGame () throws IOException //a method that initializes a new game
{
int lives = 3;
int points = 0;
System.out.println("Good Luck!");
do {
System.out.println("Points: " + points);
System.out.println("Lives: " + lives);
int correct = displayNewQuestion();
Scanner userinput = new Scanner(System.in);
int userAnswer = Integer.parseInt(userinput.nextLine());
if (userAnswer == correct) {
points ++;
System.out.println("Correct");
}
if (userAnswer != correct ) {
lives --;
System.out.println("Incorrect");
}
} while (lives > 0);
return points;
}
public static String endGame (int points) throws IOException // a method that tells the user the game is over
{
System.out.println("GAME OVER");
Scanner nameinput = new Scanner(System.in);
System.out.println("Please enter your name for the score charts!");
String newName = nameinput.next();
return newName;
}
public static int[] scoreChange (int prevScore[], int points)
{
// for(int i = 0; i < 10; i--){
// prevScore[i] = prevScore[i-1];
// }
// prevScore[1]= prevScore[0];
prevScore[0]= points;
return prevScore;
}
public static String[] nameChange (String prevScoreName[], String newName)
{
/*for(int i = 0; i < 10; i++){
prevScoreName[i] = prevScoreName[i-1];
}
//prevScoreName[1] = prevScoreName[0];*/
prevScoreName[0] = newName;
return prevScoreName;
}
public static void printInstructions () //a method that will print the instructions to the user
{
System.out.println("Instructions");
}
public static void printScores (int prevScore[], String prevScoreName[]) //a method that prints high scores
{
/* for (int i = 0; i < 10; i--){
System.out.println(prevScore[i] + " " + prevScoreName[i]);
}*/
System.out.println("Scores: ");
for (int i = prevScore.length; i > 0; i--){
System.out.println(prevScore[i-1] + " " + prevScoreName[i-1]);
}
}
public static int displayNewQuestion () // a method that displays a random arithmetic question
{
int correctAnswer = 0;
int num1 = randInt (12,-12);
int num2 = randInt(12, -12);
Random rand = new Random();
int operator = rand.nextInt((4 - 1) + 1) + 1;
if (operator == 1)
{
System.out.println(num1 + " + " + num2);
correctAnswer = num1 + num2;
}
if (operator == 2)
{
System.out.println(num1 + " - " + num2);
correctAnswer= num1 - num2;
}
if (operator == 3)
{
System.out.println(num1 + " x " + num2);
correctAnswer= num1*num2;
}
if (operator == 4)
{
if (num2 == 0) {
System.out.println(num1*num2 + " / " + num1);
correctAnswer= ((num1*num2)/num1);
}
if (num2 != 0) {
System.out.println(num1*num2 + " / " + num2);
correctAnswer= ((num1*num2)/num2);
}
}
return correctAnswer;
}
public static int randInt(int max , int min) {
Random rand = new Random();
min = -12;
max = 12;
int randnum = rand.nextInt((max - min) + 1) + min;
return randnum;
}
}
Related
I can't run the following piece of code. I would like to know why I keep getting the .noSuchElementException error. I've seen in another post is due to the fact I'm using the same Input stream for both inputs, but creating a new Scanner or using the .close method doesn't seem to fix my problem.
class Main {
public static void main(String[] args) {
Scanner scanner = new Scanner (System.in);
int tooBig = 0; // parts too big
int tooSmall = 0; // parts too small
int perfectParts= 0; // perfect parts
int a = scanner.nextInt();
scanner.close();
for (int i = 0; i <= a ; i++) {
int j = scanner.nextInt();
if(j == 1) {
tooBig++;
} else if (j == -1) {
tooSmall++;
} else if (j == 0) {
perfectParts++;
}
scanner.close();
}
System.out.println(perfectParts + " " + tooBig
+ " " + tooSmall);
}
}
Edit after having removed the scanner.close() method. I still get the same error:
import java.util.Scanner;
class Main {
public static void main(String[] args) {
Scanner scanner = new Scanner (System.in);
int tooBig = 0; // parts too big
int tooSmall = 0; // parts too small
int perfectParts= 0; // perfect parts
int a = scanner.nextInt();
for (int i = 0; i <= a ; i++) {
int j = scanner.nextInt();
if(j == 1) {
tooBig++;
} else if (j == -1) {
tooSmall++;
} else if (j == 0) {
perfectParts++;
}
}
System.out.println(perfectParts + " " + tooBig
+ " " + tooSmall);
}
}
class Main {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int tooBig = 0; // parts too big
int tooSmall = 0; // parts too small
int perfectParts= 0; // perfect parts
int a = scanner.nextInt();
for (int i = 0; i <= a ; i++) {
int j = scanner.nextInt();
if(j == 1) {
tooBig++;
} else if (j == -1) {
tooSmall++;
} else if (j == 0) {
perfectParts++;
}
}
System.out.println(perfectParts + " " + tooBig
+ " " + tooSmall);
scanner.close();
}
}
scanner.close(); Should only be called at the very end. It's also not even necessary in your specific case and likely the reason why you're getting that exception.
I am trying to compare two different strings, one character at a time. I need to return the correct number of digits until they do not equal each other anymore. However, I can't include the character of '.' in the return statement. How would I go about doing this?
import java.util.Scanner;
import java.math.BigDecimal;
public class PiEstimate {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
String a;
String b;
char y;
char c;
char d;
String userInput;
do {
System.out.print("Enter a number of randomly generated points:");
userInput = in.nextLine();
if (!isValid(userInput)) {
System.out.print("\n" + "You entered an invalid integer. Please enter a valid integer greater than 0: ");
userInput = in.nextLine();
BigDecimal estimate = new BigDecimal((Math.PI / 4) * 4);
estimate.toString();
System.out.println("\n" + "Your estimate is: " + calculation(userInput));
System.out.println("\n" + "Accuracy of digits is :" + comparison(estimate.toString(),userInput));
} else {
BigDecimal estimate = new BigDecimal((Math.PI / 4) * 4);
estimate.toString();
System.out.println("\n" + "Your estimate is: " + calculation(userInput));
System.out.println("\n" + "Accuracy of digits is :" + comparison(estimate.toString(),userInput));
}
System.out.println("\n" + "Would you like to play again? Enter 'Y' for yes or 'N' for no: ");
String optionToPlay = in.nextLine();
c = optionToPlay.charAt(0);
d = Character.toUpperCase(c);
if (d == 'n' || d == 'N') {
BigDecimal estimate2= new BigDecimal( (Math.PI / 4) * 4);
System.out.println("\n" + "The best estimate is: " + estimate2);
}
} while (d == 'Y');
} // end psvm
public static boolean isValid(String a) {
boolean isFlag = true;
char holder;
for (int i = 0; i < a.length(); i++) {
holder = a.charAt(i);
if (!Character.isDigit(a.charAt(i))) {
return false;
} if (i == 0 && holder == '-') {
return false;
}
} // end for
return isFlag;
} // end isValid
public static double calculation(String a) { // String a means 'looking for a string
double calc = Double.parseDouble(a);
int i;
double x;
double y;
double c = 0;
double runningCounter = 0;
double totalCounter;
for (i = 0; i < calc; i++) {
x = Math.random();
y = Math.random();
c = Math.sqrt((x * x) + (y * y));
if (c <= 1) {
runningCounter++;
}
} // end for
totalCounter = ((runningCounter / calc) * 4);
calc = totalCounter;
return calc;
}
public static int comparison (String bear, String userInput) {
int i = 0;
String s = calculation(userInput) + "";
int b;
int counter2 = 0;
for (i=0; i < s.length(); i++) {
if (s.charAt(i) != bear.charAt(i)) {
return i;
}
}
return i;
} // end comparison
} // end class
Code from IDE
i have a exercice to do in Java. I need to create a World Cup tournament and the restriction is that the program will restart until my favourite team win. However, if my team didn't win after 20 times, the program stop
The problem is when I try to put the second restriction (20 times max) with a for after the while (true), I always get an infinite loop.
//Q1
String[] teams16 = {"Uruguay", "Portugal", "France", "Argentina", "Brazil", "Mexico",
"Belgium", "Japan", "Spain", "Russia", "Croatia", "Denmark", "Sweden", "Switzerland",
"Colombia", "England"};
//data
Scanner keyboard = new Scanner(System.in);
Random result = new Random();
System.out.print("Enter your favourite team: ");
String team = keyboard.nextLine();
boolean teamwc = false;
// choice of the favourite team
for (int i = 0 ; i < 16 ; i++ ) {
if (teams16[i].equalsIgnoreCase(team)) {
teamwc = true;
}
}
if(teamwc == false) {
System.out.println("Your team is not in the Round of 16 ");
}
// the tournament begins (ROUND OF 16)
while (true) {
if (teamwc == true) {
int z = 0;
String[] winnerof16 = new String[8];
int a = 0;
System.out.print("ROUND OF 16:");
for (int i = 0; i < 16 ; i+=2) {
int score1 = result.nextInt(5);
int score2 = result.nextInt(5);
if (score1 > score2) {
winnerof16 [a] = teams16[i];
}
else if (score1 < score2) {
winnerof16[a] = teams16[i+1];
} else if (score1 == score2) {
Random overtime = new Random();
int ot = overtime.nextInt(2);
if (ot == 0) {
score1++;
winnerof16[a] = teams16[i];
} else if (ot == 1) {
score2++;
winnerof16[a]=teams16[i+1];
}
}
System.out.print("["+teams16[i] +"]"+ " " + score1+":"+score2 + " " + "["+teams16[i+1]+"]" + " ");
a++;
}
System.out.println();
String[] winnerof8 = new String[4];
int b = 0;
System.out.print("QUARTER-FINALS:");
for (int k = 0 ; k < 8 ; k+=2) {
int score3 = result.nextInt(5);
int score4 = result.nextInt(5);
if (score3 > score4) {
winnerof8[b]=winnerof16[k];
}
else if (score3 < score4) {
winnerof8[b] = winnerof16[k+1];
} else if (score3 == score4) {
Random overtime2 = new Random();
int ot2 = overtime2.nextInt(2);
if (ot2 == 0) {
score3++;
winnerof8[b]=winnerof16[k];
} else if (ot2 == 1) {
score4++;
winnerof8[b]=winnerof16[k+1];
}
}
System.out.print("["+winnerof16[k] +"]"+ " " + score3+":"+score4 + " " + "["+winnerof16[k+1]+"]" + " ");
b++;
}
System.out.println();
String[] winnerof4 = new String[2];
int c = 0;
System.out.print("SEMI-FINALS:");
for (int l = 0 ; l < 4 ; l+=2) {
int score5 = result.nextInt(5);
int score6 = result.nextInt(5);
if (score5 > score6) {
winnerof4[c]=winnerof8[l];
}
else if (score5 < score6) {
winnerof4[c] = winnerof8[l+1];
} else if (score5 == score6) {
Random overtime3 = new Random();
int ot3 = overtime3.nextInt(2);
if (ot3 == 0) {
score5++;
winnerof4[c]=winnerof8[l];
} else if (ot3 == 1) {
score6++;
winnerof4[c]=winnerof8[l+1];
}
}
System.out.print("["+winnerof8[l] +"]"+ " " + score5+":"+score6 + " " + "["+winnerof8[l+1]+"]" + " ");
c++;
}
System.out.println();
String[] winnerof2 = new String[1];
int d = 0;
System.out.print("FINALS:");
for (int m = 0 ; m < 2 ; m+=2) {
int score7 = result.nextInt(5);
int score8 = result.nextInt(5);
if (score7 > score8) {
winnerof2[d]=winnerof4[m];
}
else if (score7 < score8) {
winnerof2[d] = winnerof4[m+1];
} else if (score7 == score8) {
Random overtime4 = new Random();
int ot4 = overtime4.nextInt(2);
if (ot4 == 0) {
score7++;
winnerof2[d]=winnerof4[m];
} else if (ot4 == 1) {
score8++;
winnerof2[d]=winnerof4[m+1];
}
}
System.out.print("["+winnerof4[m] +"]"+ " " + score7+":"+score8 + " " + "["+winnerof4[m+1]+"]" + " ");
System.out.println();
}
System.out.println("Tournament: " + z + " The WINNER is: " + winnerof2[d]);
z++;
if (winnerof2[d].equalsIgnoreCase(team)) {
break;
}
}
}
}
}
This is my code before I put the second restriction.
Is there a problem with my code ? How can I put the second restriction ? Thank you
The infinite loop is due to this 2:
while (true) { // it will quit while loop only when an exception raised
if (teamwc == true) { // after this you nowhere assign teamwc == false therefore it is always true
instead of direct assigning True to while loop, use a boolean variable or a condition to quit somewhere:
t = true
while(t):
OR
while n>0:
I'm trying to add spaces and a counter between consecutive runs in a simple java coin toss program.
I want this output: HHHHTHTTTTTTTHTTTHHHTTTTHTTHHHTTTTHHTHHHHHTTTTTTHT
to look print like this: HHHH4 T1 H1 TTTTTTT7 H1 TTT3 HHH3 TTTT4 H1 TT2 HHH3 TTTT4 HH2 T1 HHHHH5 TTTTTT6 H1 T1
I am not sure how to position the conditions in the loop so that spaces and a counter are printed between the consecutive 'T's and 'H's. Do I need to use a different kind of loop? I have tried rearranging the loop and using break; and continue; but haven't gotten the result to print correctly.
public static void main(String[] args) {
Scanner scnr = new Scanner(System.in);
System.out.print("How many times do you want to flip the coin? ");
int timesFlipped = scnr.nextInt();
Random randomNum = new Random();
for (int i=0; i < timesFlipped; i++) {
int currentflip = randomNum.nextInt(2);
int previousFlip = 0;
int tailsCount = 0;
int headsCount = 0;
if (currentflip == 0) {
System.out.print("H");
previousFlip = 0;
headsCount++;
}
else if (currentflip == 1) {
System.out.print("T");
previousFlip = 1;
tailsCount++;
}
if (previousFlip == 0 && currentflip == 1) {
System.out.print(headsCount + " ");
headsCount = 0;
}
else if (previousFlip == 1 && currentflip == 0) {
System.out.print(tailsCount + " ");
tailsCount = 0;
}
}
}
You can just store the last flip and a counter like
public static void main(String[] args) {
Scanner scnr = new Scanner(System.in);
System.out.print("How many times do you want to flip the coin? ");
int timesFlipped = scnr.nextInt();
Random randomNum = new Random();
int counter = 1;
int previousFlip = randomNum.nextInt(2);
printFlip(previousFlip);
for (int i=1; i < timesFlipped; i++) {
int currentflip = randomNum.nextInt(2);
if (currentflip == previousFlip) {
counter++;
} else {
System.out.print(counter + " ");
counter = 1;
previousFlip = currentflip;
}
printFlip(currentflip);
}
System.out.print(counter);
}
private static void printFlip(int currentflip) {
if (currentflip == 0) {
System.out.print("H");
}
else if (currentflip == 1) {
System.out.print("T");
}
}
Via a single method:
public static void main(String[] args) {
Scanner scnr = new Scanner(System.in);
System.out.print("How many times do you want to flip the coin? ");
int timesFlipped = scnr.nextInt();
if (timesFlipped <= 0)
return;
Random randomNum = new Random();
boolean isHeads = false;
int sequence = 0;
for (int i = 0; i < timesFlipped; i++) {
boolean prevFlip = isHeads;
isHeads = randomNum.nextBoolean();
if (i > 0 && isHeads != prevFlip) {
System.out.print(sequence + " ");
sequence = 0;
}
sequence++;
System.out.print(isHeads ? "H" : "T");
}
System.out.println(sequence);
}
Below is my code, and there are no errors in the actual code, but it won't run and I am not sure how to fix it. I have been working on this assignment for hours and keep receiving the same error in the output box over and over.
import java.util.Scanner;
public class whatTheGerbils
{
public static void main(String[] args)
{
whatTheGerbils toRun = new whatTheGerbils();
toRun.gerbLab();
}
Gerbil[] gerbilArray;
Food[] foodArray;
int numGerbils;
int foodnum;
public whatTheGerbils() {}
public void gerbLab()
{
boolean gerbLab = true;
while(gerbLab)
{
foodnum = 0;
numGerbils = 0;
String nameOfFood = "";
String colorOfFood;
int maxAmount = 0;
String ID;
String name;
String onebite;
String oneescape;
boolean bite = true;
boolean escape = true;
Scanner keyboard = new Scanner(System.in);
System.out.println("How many types of food do the gerbils eat?");
int foodnum = Integer.parseInt(keyboard.nextLine());
foodArray = new Food[foodnum];
for (int i = 0; i < foodnum; i++)
{
System.out.println("The name of food item " + (i+1) + ":"); //this is different
nameOfFood = keyboard.nextLine();
System.out.println("The color of food item " + (i+1) + ":");
colorOfFood = keyboard.nextLine();
System.out.println("Maximum amount consumed per gerbil:");
maxAmount = keyboard.nextInt();
keyboard.nextLine();
foodArray[i] = new Food(nameOfFood, colorOfFood, maxAmount);
}
System.out.println("How many gerbils are in the lab?");
int numGerbils = Integer.parseInt(keyboard.nextLine()); // this is different
gerbilArray = new Gerbil[numGerbils];
for (int i = 0; i < numGerbils; i++)
{
System.out.println("Gerbil " + (i+1) + "'s lab ID:");
ID = keyboard.nextLine();
System.out.println("What name did the undergrads give to "
+ ID + "?");
name = keyboard.nextLine();
Food[] gerbsBetterThanMice = new Food[foodnum];
int foodType = 0;
for(int k = 0; k < foodnum; k++)
{
boolean unsound = true;
while(unsound)
{
System.out.println("How much " + foodArray[k].getnameOfFood() + "does" + name + " eat?");
foodType = keyboard.nextInt();
keyboard.nextLine();
if(foodType <= foodArray[k].getamtOfFood())
{
unsound = false;
}
else
{
System.out.println("try again");
}
}
gerbsBetterThanMice[k] = new Food(foodArray[k].getnameOfFood(), foodArray[k].getcolorOfFood(), foodType);
}
boolean runIt = true;
while (runIt)
{
System.out.println("Does " + ID + "bite? (Type in True or False)");
onebite = keyboard.nextLine();
if(onebite.equalsIgnoreCase("True"))
{
bite = true;
runIt = false;
}
else if (onebite.equalsIgnoreCase("False"))
{
bite = false;
runIt = false;
}
else {
System.out.println("try again");
}
}
runIt = true;
while(runIt)
{
System.out.println("Does " + ID + "try to escape? (Type in True or False)");
oneescape = keyboard.nextLine();
if(oneescape.equalsIgnoreCase("True"))
{
escape = true;
runIt = false;
}
else if(oneescape.equalsIgnoreCase("False"))
{
escape = false;
runIt = false;
}
else
{
System.out.println("try again");
}
}
gerbilArray[i] = new Gerbil(ID, name, bite, escape, gerbsBetterThanMice);
}
for(int i = 0; i < numGerbils; i++)
{
for(int k = 0; k < numGerbils; k++)
{
if(gerbilArray[i].getID().compareTo(gerbilArray[k].getID()) >
0)
{
Gerbil tar = gerbilArray[i];
gerbilArray[i] = gerbilArray[k];
gerbilArray[k] = tar;
}
}
}
boolean stop = false;
String prompt = "";
while(!stop)
{
System.out.println("Which function would you like to carry out: average, search, restart, or quit?");
prompt = keyboard.nextLine();
if (prompt.equalsIgnoreCase("average"))
{
System.out.println(averageFood());
}
else if (prompt.equalsIgnoreCase("search"))
{
String searchForID = "";
System.out.println("What lab ID do you want to search for?");
searchForID = keyboard.nextLine();
Gerbil findGerbil = findThatRat(searchForID);
if(findGerbil != null)
{
int integer1 = 0;
int integer2 = 0;
for (int i = 0; i < numGerbils; i++)
{
integer1 = integer1 + foodArray[i].getamtOfFood();
integer2 = integer2 + findGerbil.getGerbFood()[i].getamtOfFood();
}
System.out.println("Gerbil name: " +
findGerbil.getName() + " (" + findGerbil.getBite() + ", " +
findGerbil.getEscape() + ") " +
Integer.toString(integer2) + "/" + Integer.toString(integer1));
}
else
{
System.out.println("error");
}
}
else if (prompt.equalsIgnoreCase("restart"))
{
stop = true;
break;
}
else if(prompt.equalsIgnoreCase("quit"))
{
System.out.println("program is going to quit");
gerbLab = false;
stop = true;
keyboard.close();
}
else
{
System.out.println("error, you did not type average, search, restart or quit");
}
}
}
}
public String averageFood()
{
String averageStuff = "";
double avg = 0;
double num1 = 0;
double num2 = 0;
for (int i = 0; i < numGerbils; i++)
{
averageStuff = averageStuff + gerbilArray[i].getID();
averageStuff = averageStuff + " (";
averageStuff = averageStuff + gerbilArray[i].getName();
averageStuff = averageStuff + ") ";
for (int k = 0; k < foodnum; k++)
{
num1 = num1 + foodArray[k].getamtOfFood();
num2 = num2 + gerbilArray[i].getGerbFood()[k].getamtOfFood();
}
avg = 100*(num2/num1);
avg = Math.round(avg);
averageStuff = averageStuff + Double.toString(avg);
averageStuff = averageStuff + "%\n";
}
return averageStuff;
}
public Gerbil findThatRat (String ID)
{
for(int i = 0; i < numGerbils; i++)
{
if(ID.contentEquals(gerbilArray[i].getID()))
{
return gerbilArray[i];
}
}
return null;
}
}
Whenever a Java program runs, it starts with a method called main. You are getting the error because you don't have such a method. If you write such a method, then what it needs to do is this.
Create an object of the whatTheGerbils class.
Run the gerbLab() method for the object that was created.
The simplest way to do this would be to add the following code inside the whatTheGerbils class.
public static void main(String[] args){
whatTheGerbils toRun = new whatTheGerbils();
toRun.gerbLab();
}
You need a main method in your code for it to run, add in something like this
public static void main(String [] args){
gerLab();
}