好的，所以它不是动作方法中的问题，而是当它显示在新帧上时。这是新代码，显示计数和平均分数两次，一次在第一帧（正确值），然后在第二帧（由于未知原因设置回0）。
package testing2;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Testing2 extends JFrame implements ActionListener {
private double score;
protected double totalScore;
protected double averageScore;
protected int counter = 0;
JButton next = new JButton("Next");
JButton display = new JButton("Display");
JTextField scoreField = new JTextField("0", 3);
JTextField commentField = new JTextField(30);
JLabel explainationLabel = new JLabel("Please Score your overall saticfaction with our app");
JLabel explainationLabel2 = new JLabel("Enter any comments or suggestions");
JLabel testDisplay = new JLabel();
public Testing2() {
super("App Survey");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(new FlowLayout());
add(explainationLabel);
add(scoreField);
add(explainationLabel2);
add(commentField);
add(next);
add(display);
add(testDisplay);
next.addActionListener(this);
display.addActionListener(this);
}
public Testing2 (String t){
super(t);
}
public void actionPerformed(ActionEvent e) {
Object source = e.getSource();
if(source == next) {
score = Double.parseDouble(scoreField.getText());
if(score < 11 && score > 0)
{
totalScore += score;
counter ++;
scoreField.setText("0");
commentField.setText("");
}
else
JOptionPane.showMessageDialog(null, "Please enter a score bettween 1 and 10", "Error", JOptionPane.ERROR_MESSAGE);
}
else {
averageScore = totalScore / counter;
testDisplay.setText("The average score is: " + averageScore + " out of " + counter + " votes.");
viewLoginFrame();
}
}
public static void main(String[] args) {
Testing2 testFrame = new Testing2();
final int WIDTH = 375;
final int HEIGHT = 200;
testFrame.setSize(WIDTH, HEIGHT);
testFrame.setVisible(true);
}
public void viewLoginFrame() {
secondframe loginFrame = new secondframe();
final int WIDTH = 300;
final int HEIGHT = 200;
loginFrame.setSize(WIDTH, HEIGHT);
loginFrame.setVisible(true);
}
}
package testing2;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class secondframe extends Testing2 {
JLabel displayScore = new JLabel();
JLabel displayScore2 = new JLabel();
JLabel displayCommentCounter = new JLabel();
public secondframe() {
super("Survey Results");
//setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(new FlowLayout());
add(displayScore);
add(displayScore2);
add(displayCommentCounter);
displayScore.setText("The average overall saticfaction");
displayScore2.setText("score for the day is: " + averageScore);
displayCommentCounter.setText("The total number of Surveys taken was: " + counter);
}
}
答案 0 :(得分：2)
您的问题是由于滥用继承造成的。您正在尝试将信息从一个对象传递到另一个对象，这是编程中的常见问题，解决方案就是这样做，创建两个对象，然后通过调用setter方法或传递在需要的地方和时间传递信息它成为一个构造函数。你试图通过让第二个对象扩展第一个对象来做到这一点，这是行不通的，因为第二个对象是完全唯一的，并且与第一个对象分开，具有自己的不可转移状态。解决方案：摆脱滥用继承。
例如：
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Testing2 extends JFrame implements ActionListener {
private double score;
protected double totalScore;
protected double averageScore;
protected int counter = 0;
JButton next = new JButton("Next");
JButton display = new JButton("Display");
JTextField scoreField = new JTextField("0", 3);
JTextField commentField = new JTextField(30);
JLabel explainationLabel = new JLabel(
"Please Score your overall saticfaction with our app");
JLabel explainationLabel2 = new JLabel("Enter any comments or suggestions");
JLabel testDisplay = new JLabel();
public Testing2() {
super("App Survey");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(new FlowLayout());
add(explainationLabel);
add(scoreField);
add(explainationLabel2);
add(commentField);
add(next);
add(display);
add(testDisplay);
next.addActionListener(this);
display.addActionListener(this);
}
public Testing2(String t) {
super(t);
}
public void actionPerformed(ActionEvent e) {
Object source = e.getSource();
if (source == next) {
score = Double.parseDouble(scoreField.getText());
if (score < 11 && score > 0) {
totalScore += score;
counter++;
scoreField.setText("0");
commentField.setText("");
} else
JOptionPane.showMessageDialog(null, "Please enter a score bettween 1 and 10",
"Error", JOptionPane.ERROR_MESSAGE);
} else {
averageScore = totalScore / counter;
testDisplay.setText("The average score is: " + averageScore + " out of " + counter
+ " votes.");
viewLoginFrame();
}
}
public static void main(String[] args) {
Testing2 testFrame = new Testing2();
final int WIDTH = 375;
final int HEIGHT = 200;
testFrame.setSize(WIDTH, HEIGHT);
testFrame.setVisible(true);
}
public void viewLoginFrame() {
// !! SecondFrame2 loginFrame = new SecondFrame2();
SecondFrame2 loginFrame = new SecondFrame2(this); // !!
final int WIDTH = 300;
final int HEIGHT = 200;
loginFrame.setSize(WIDTH, HEIGHT);
loginFrame.setVisible(true);
}
public double getAverageScore() {
return averageScore;
}
public int getCounter() {
return counter;
}
}
class SecondFrame2 extends JFrame {
JLabel displayScore = new JLabel();
JLabel displayScore2 = new JLabel();
JLabel displayCommentCounter = new JLabel();
private Testing2 testing2; // set up field if we need it
// !! accept a Testing2 object in parameter
public SecondFrame2(Testing2 testing2) {
super("Survey Results");
this.testing2 = testing2; // use the parameter to set the reference
// setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(new FlowLayout());
add(displayScore);
add(displayScore2);
add(displayCommentCounter);
displayScore.setText("The average overall saticfaction");
// !! extract the information we need by calling methods on testing2:
// displayScore2.setText("score for the day is: " + averageScore);
displayScore2.setText("score for the day is: " + testing2.getAverageScore());
// displayCommentCounter.setText("The total number of Surveys taken was: " + counter);
displayCommentCounter.setText("The total number of Surveys taken was: " + testing2.getCounter());
}
}
请注意，此代码不能解决代码中的许多其他问题。