我正在努力学习Java，但我有点挣扎。我正在尝试从教科书中做作业，所以我用 javascript 完成了它，并使用我对 Java 的有限知识来转换它。（这是原始说明 - http://i518.photobucket.com/albums/u341/ACrippledFerret/5ea8ec0e-02aa-4b96-b207-a83c52f8db48_zps2cd2ab7f.jpg）
我认为我的大部分内容都是正确的，但我遇到了一些错误。几乎所有的都是“（变量）无法解析为变量”。在我的最后一种方法中，它发生在很多变量上。我似乎在某处也遇到了括号问题......“令牌“}”上的语法错误，{ 预计在此令牌之后”。
如果有人可以帮助修复此代码，我将不胜感激。我是 Java 新手，所以这对我来说翻译起来有点困难。第一组代码是javascript，第二组代码是我翻译的java（这不起作用）。谢谢你的帮助。
JAVASCRIPT
window.onload=function(){
var difficulty = 1,
operators = ['plus', 'minus', 'times', 'divided by'],
selectedOperator = 1,
correctAnswers = 0,
answeredTyped = 0;
var difficultyInput = parseInt(prompt('Please choose the difficulty. Enter the number of digits to use in each problem.'), 10);
if(difficultyInput > 0) {
difficulty = difficultyInput;
}
var arithmeticMethod = parseInt(prompt('Choose an arithmetic problem to study:\n1 = Addition Only\n2 = Subtraction Only\n3 = Multiplication Only\n4 = Division Only\n5 = Random Problems'), 10);
if(arithmeticMethod == 5 || operators[arithmeticMethod - 1]) {
selectedOperator = arithmeticMethod;
}
function checkResponse(primaryInt, secondaryInt, operatorText, suggestedAnswer) {
var result = false;
switch (operatorText) {
case 'plus':
return (primaryInt + secondaryInt) == suggestedAnswer;
case 'minus':
return (primaryInt - secondaryInt) == suggestedAnswer;
case 'times':
return (primaryInt * secondaryInt) == suggestedAnswer;
case 'divided by':
return (primaryInt / secondaryInt) == suggestedAnswer;
default:
return false;
}
}
function displayResponse(isCorrect) {
var randomIndex = Math.floor(Math.random() * (4 - 1 + 1)) + 1;
switch (randomIndex) {
case 1:
return isCorrect ? 'Very good!' : 'No. Please try again.';
case 2:
return isCorrect ? 'Excellent!' : 'Wrong. Try once more.';
case 3:
return isCorrect ? 'Nice Work!' : 'Don\'t give up!';
case 4:
return isCorrect ? 'Keep up the good work!' : 'No. Keep trying.';
default:
return 'Woops...';
}
}
function askQuestion() {
var correctAnswer = false;
var primaryInt = Math.floor(Math.pow(10, difficulty-1) + Math.random() * 9 * Math.pow(10, difficulty-1));
secondaryInt = Math.floor(Math.pow(10, difficulty-1) + Math.random() * 9 * Math.pow(10, difficulty-1));
operatorText = (selectedOperator == 5) ? operators[Math.floor(Math.random() * operators.length)] : operators[selectedOperator - 1];
while(!correctAnswer && answeredTyped < 10) {
var response = parseFloat(prompt('How much is ' + primaryInt + ' ' + operatorText + ' ' + secondaryInt + '?'));
correctAnswer = checkResponse(primaryInt, secondaryInt, operatorText, response);
alert(displayResponse(correctAnswer));
answeredTyped++;
if(correctAnswer)
correctAnswers++;
}
}
while(answeredTyped < 10) {
askQuestion();
}
if((correctAnswers / answeredTyped) >= 0.75) {
alert('Congratulations, you are ready to go on the next level!');
} else {
alert('Please ask your teacher for extra help.');
}
}
JAVA
import java.util.*;
import javax.swing.JOptionPane;
/**
*
*/
/**
* @author Tyler
*
*/
public class Assignment2 {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input = new Scanner(System.in);
int difficulty = 1;
String[] operators = {"plus", "minus", "times", "divided by"};
int selectedOperator = 1;
int correctAnswers = 0;
int answeredTyped = 0;
int difficultyInput = Integer.parseInt(JOptionPane.showInputDialog("Please choose the difficulty. Enter the number of digits to use in each problem."));
if (difficultyInput > 0) {
difficulty = difficultyInput;
}
int arithmeticMethod = Integer.parseInt(JOptionPane.showInputDialog("Choose an arithmetic problem to study: 1 = Addition Only, 2 = Subtraction Only, 3 = Multiplication Only, 4 = Division Only, 5 = Random Problems" ));
selectedOperator = arithmeticMethod;
}
public static boolean checkResponse (double primaryInt, double secondaryInt, String operatorText, float response){
boolean result = false;
switch (operatorText){
case "1":
return (primaryInt + secondaryInt) == response;
case "2":
return (primaryInt - secondaryInt) == response;
case "3":
return (primaryInt * secondaryInt) == response;
case "4":
return (primaryInt / secondaryInt) == response;
}
return false;
}
public static String displayResponse (boolean isCorrect){
int randomIndex = (int) (Math.floor(Math.random() * (4 - 1 + 1)) + 1);
switch (randomIndex){
case 1:
return isCorrect ? "Very Good!" : "No. Please try again.";
case 2:
return isCorrect ? "Excellent!" : "Wrong. Try once more.";
case 3:
return isCorrect ? "Nice Work!" : "Don\'t give up!";
case 4:
return isCorrect ? "Keep up the good work!" : "No. Keep trying.";
}
return "Oops...";
}
public static void askQuestion(int difficulty, String operatorText, int selectedOperator, int answeredTyped, String[] operators, int correctAnswers){
boolean correctAnswer = false;
double primaryInt = Math.floor(Math.pow(10, difficulty-1) + Math.random() * 9 * Math.pow(10, difficulty-1));
double secondaryInt = Math.floor(Math.pow(10, difficulty-1) + Math.random() * 9 * Math.pow(10, difficulty-1));
operatorText = (selectedOperator == 5) ? operators[(int) Math.floor(Math.random() * operators.length)] : operators[selectedOperator - 1];
while(!correctAnswer && answeredTyped < 10) {
float response = Float.parseFloat (JOptionPane.showInputDialog("How much is " + primaryInt + " " + operatorText + " " + secondaryInt + "?"));
correctAnswer = checkResponse (primaryInt, secondaryInt, operatorText, response);
JOptionPane.showMessageDialog(null, displayResponse(correctAnswer));
answeredTyped++;
if(correctAnswer)
correctAnswers++;
}
{
while(answeredTyped < 10){
askQuestion(0, null, 0, 0, null, 0);
}
if((correctAnswers / answeredTyped) >= 0.75) {
JOptionPane.showMessageDialog(null, "Congratulations, you are ready to go on to the next level!");
}
else{
JOptionPane.showMessageDialog(null, "Please ask your teacher for extra help.");
}
}
}
}