我必须在java中使用类之间的MVC样式格式制作计算器GUI样式，我试图通过具有真/假布尔值来区分他们输入的第一个数字和第二个数字，所以如果它是真的那么数字就是第一个，如果它是假的，那么它应该识别出它是一个新数字，并且他们已经按下了加号或减号。我使用了一个返回布尔值的公共布尔方法，但是我在 Calculations 类中的 if 语句由于某种原因不起作用。这是代码
计算类
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class Calc extends JFrame implements ActionListener {
private JTextField numDisplay = new JTextField(10);
private JButton plusButton = new JButton("+");
private JButton minusButton = new JButton("-");
private JButton clearButton = new JButton("Clear");
private JButton equalsButton = new JButton("=");
private JButton zeroButton = new JButton("0");
private JButton oneButton = new JButton("1");
private JButton twoButton = new JButton("2");
private JButton threeButton = new JButton("3");
private JButton fourButton = new JButton("4");
private JButton fiveButton = new JButton("5");
private JButton sixButton = new JButton("6");
private JButton sevenButton = new JButton("7");
private JButton eightButton = new JButton("8");
private JButton nineButton = new JButton("9");
private String number = "";
private boolean trueFalse; //plus or minus
private boolean onOff = false; //false = 1st int, true = 2nd int
private int total;
Calc(){
JPanel calcPanel = new JPanel();
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setSize(400, 600);
calcPanel.add(numDisplay);
calcPanel.add(plusButton);
calcPanel.add(minusButton);
calcPanel.add(clearButton);
calcPanel.add(equalsButton);
calcPanel.add(zeroButton);
calcPanel.add(oneButton);
calcPanel.add(twoButton);
calcPanel.add(threeButton);
calcPanel.add(fourButton);
calcPanel.add(fiveButton);
calcPanel.add(sixButton);
calcPanel.add(sevenButton);
calcPanel.add(eightButton);
calcPanel.add(nineButton);
this.add(calcPanel);
plusButton.addActionListener(this);
minusButton.addActionListener(this);
clearButton.addActionListener(this);
equalsButton.addActionListener(this);
zeroButton.addActionListener(this);
oneButton.addActionListener(this);
twoButton.addActionListener(this);
threeButton.addActionListener(this);
fourButton.addActionListener(this);
fiveButton.addActionListener(this);
sixButton.addActionListener(this);
sevenButton.addActionListener(this);
eightButton.addActionListener(this);
nineButton.addActionListener(this);
}
public void actionPerformed(ActionEvent event){
if (event.getSource() instanceof JButton){
JButton clickedButton = (JButton) event.getSource();
String buttonText = clickedButton.getText();
number = number + buttonText;
if (clickedButton == clearButton){
number = "";
onOff = false;
}
if (clickedButton == plusButton){
trueFalse = true;
onOff = true;
}
if (clickedButton == minusButton){
trueFalse = false;
onOff = true;
number = "";
}
}
}
public int getNumber(){
return Integer.parseInt(number);
}
public boolean trueFalse(){
return trueFalse;
}
public boolean onOff(){
return onOff;
}
public int total(){
return total;
}
}
这是我遇到问题的计算类。
public class Calculations
{
private Calc theView;
private CalculationModel theModel;
private boolean onOff = theView.onOff();
private boolean trueFalse = theView.trueFalse();
public Calculations(Calc theView, CalculationModel theModel)
{
this.theView = theView;
this.theModel = theModel;
}
if(trueFalse == true) //this if statement isn't working
{
private int number1 = theView.getNumber();
}
}