I trying to make a math quiz game that generates random question and keep track of of what question are wrong and write.
I trying to figure out how to make my program respond if the answer written in the text field is correct or incorrect when I click the JButton `answerbutton`. I'm very new to using `ActionListener`.
好的，所以我让动作监听器开始工作，但是当我输入答案时，它说我的答案是错误的，即使它是正确的。出现的第一个问题很好，但在那之后，它说我所有的答案都是错误的，它仍然不会跟踪我的分数。
import java.util.Scanner;
import javax.swing.*;
import javax.swing.border.TitledBorder;
import java.util.Random;
import java.util.Scanner;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class PracticeMath extends JFrame {
Scanner k = new Scanner(System.in);
Random generator = new Random();
protected JButton excerciseButton = new JButton( "New Excerices" ); // start new quiz session
protected JButton answerButton = new JButton( "Answer" ); // set new question, check if the answer correct or wrong
protected JLabel titlelabel = new JLabel( "How much is: " );
protected int correctcounter = 0; // keep track of correct answer
protected int wrongcounter = 0; // keep track of wrong answer
protected int one = generator.nextInt(10);//generate ranodm first number of question
protected int two = generator.nextInt(10); // generate random second number of question
protected int i = generator.nextInt(4); // generate random operator
protected char[] ops = { '+', '-', '/', '*' }; // the math operator
protected JLabel correctlabel = new JLabel(" Number of Correct Answer: ");
protected JLabel wronglabel = new JLabel( " Number of Wrong answers: " );
protected JLabel firstnum = new JLabel("" + one); // display first number
protected JLabel secondnum = new JLabel("" + two); // display second number
protected JLabel randomOP = new JLabel("" + ops[i]); display operator
protected JLabel equalOP = new JLabel("=");
protected JTextField answerText = new JTextField(); //text area for writing you answer
protected JLabel questionmark = new JLabel("?");
protected JLabel correct = new JLabel(""+ correctcounter); // display correct answer
protected JLabel wrong = new JLabel(""+ wrongcounter); // display wrong answer
protected JLabel commentlabel = new JLabel(""); // set a comment for how good you doing. optionial
public PracticeMath(){
answerText.setColumns(5);
JPanel Panel1 = new JPanel();// add a panel
FlowLayout flowLayout = (FlowLayout) Panel1.getLayout();// layout for panel
getContentPane().setLayout( new FlowLayout( FlowLayout.LEFT, 5, 5)); // set layout
getContentPane().add(Panel1); // set panel
titlelabel.setForeground(Color.ORANGE);
titlelabel.setFont(new Font("Tahoma", Font.PLAIN, 25));
Panel1.add(titlelabel);
firstnum.setFont(new Font("Tahoma", Font.PLAIN, 20));
Panel1.add(firstnum);
randomOP.setFont(new Font("Tahoma", Font.PLAIN, 25));
Panel1.add(randomOP);
secondnum.setFont(new Font("Tahoma", Font.PLAIN, 20));
Panel1.add(secondnum);
equalOP.setFont(new Font("Tahoma", Font.PLAIN, 20));
Panel1.add(equalOP);
Panel1.add(answerText);
questionmark.setFont(new Font("Tahoma", Font.PLAIN, 20));
Panel1.add(questionmark);
Panel1.add(commentlabel);
JPanel Panel3 = new JPanel();
FlowLayout flowLayout3 = (FlowLayout) Panel3.getLayout();
flowLayout3.setHgap(15);
getContentPane().setLayout( new FlowLayout( FlowLayout.LEFT, 5, 5));
getContentPane().add(Panel3);
Panel3.add(excerciseButton);
Panel3.add(answerButton);
JPanel panel2 = new JPanel();
panel2.setBorder(new TitledBorder("Statistic"));
getContentPane().add(panel2);
panel2.setLayout(new GridLayout(0, 2, 0, 0));
panel2.add(correctlabel);
panel2.add(wronglabel);
correct.setForeground(Color.GREEN);
correct.setFont(new Font("Tahoma", Font.PLAIN, 25));
panel2.add(correct);
wrong.setForeground(Color.RED);
wrong.setFont(new Font("Tahoma", Font.PLAIN, 25));
panel2.add(wrong);
answerButton.addActionListener( this );
}
public static void main(String[] args) {
PracticeMath frame = new PracticeMath();
frame.pack();
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(400,400);
frame.setTitle( "Math Practice");
frame.setVisible(true);
}
public void actionPerformed( ActionEvent ae )
{
String answer = answerText.getText();
int answerint = Integer.parseInt(answer);
if(one + two == answerint){
correctcounter++;
System.out.println("correct");
firstnum.setText("" + generator.nextInt(11));
randomOP.setText("" + ops[generator.nextInt(4)]);
secondnum.setText("" + generator.nextInt(11));
}
else if(one-two == answerint){
correctcounter++;
System.out.println("correct");
firstnum.setText("" + generator.nextInt(11));
randomOP.setText("" + ops[generator.nextInt(4)]);
secondnum.setText("" + generator.nextInt(11));
}
else if(one * two ==answerint){
correctcounter++;
System.out.println("correct");
firstnum.setText("" + generator.nextInt(11));
randomOP.setText("" + ops[generator.nextInt(4)]);
secondnum.setText("" + generator.nextInt(11));
}else if(one/two == answerint){
correctcounter++;
System.out.println("correct");
firstnum.setText("" + generator.nextInt(11));
randomOP.setText("" + ops[generator.nextInt(4)]);
secondnum.setText("" + generator.nextInt(11));
}
else{
wrongcounter++;
System.out.println("wrong");
firstnum.setText("" + generator.nextInt(11));
randomOP.setText("" + ops[generator.nextInt(4)]);
secondnum.setText("" + generator.nextInt(11));
}
}
}