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我正在使用 MVC 风格制作一个 java 计算器。我只是无法区分他们输入的第一个数字和第二个数字。我输入了一个布尔值，当输入加号或减号时变为真，这会将数字字符串更改回“”，一个空白字符串。但是当我在这个布尔值为真时去获取它时，字符串已经是空白的，所以为时已晚。关于如何获得第一个数字然后是第二个数字的任何建议？这个计算器只是使用加号和减号。带有一个等于和清除按钮。谢谢

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;
    private boolean isEquals = false;   // false = haven't clicked equals button yet,     true they have
    //private String numberText;

    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();
            if (clickedButton == zeroButton || clickedButton == oneButton || clickedButton == twoButton || clickedButton == threeButton || clickedButton == fourButton || clickedButton == fiveButton || clickedButton == sixButton || clickedButton == sevenButton || clickedButton == eightButton || clickedButton == nineButton)
            {
                number = number + buttonText;
            }
            if (clickedButton == clearButton){
                number = "";
                onOff = false;
            }
            if (clickedButton == plusButton){
                trueFalse = true;
                onOff = true;
            }
            if (clickedButton == minusButton){
                trueFalse = false;
                onOff = true;
                number = "";
            }
            if (clickedButton == equalsButton){
                isEquals = true;
            }
        }
    }
    public int getNumber(){
        return Integer.parseInt(number);
    }
    public boolean trueFalse(){
        return trueFalse;
    }
    public boolean onOff(){
        return onOff;
    }
    public int total(){
        return total;
    }
    public boolean isEquals(){
        return isEquals;
    }
    public String getNumberString(){
        return number;
    }
}

计算类

public class Calculations
{
    private Calc theView;
    private CalculationModel theModel;
    private boolean onOff = theView.onOff();
    private boolean trueFalse = theView.trueFalse();
    private int number1;

    public Calculations(Calc theView, CalculationModel theModel)
    {
        this.theView = theView;
        this.theModel = theModel;
    }

    public void doesometing() {
        if(trueFalse)     
        {
            number1 = theView.getNumber();
        }
    }   
}
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1 回答 1

1

处理用户输入的一种方法是将用户输入的值压入堆栈。这样他最近的值是最后的。

要进行计算，您从堆栈中弹出两个值，运行计算并将结果压入堆栈。输入的下一个值 thn 在最后一个结果之后进入堆栈。

编辑：收集数字以制作数字可以通过将数字附加到字符串的末尾并在按下非数字时将字符串转换为数字来完成。请注意，连续两个点不是有效数字，因此您需要处理它。

于 2013-03-28T22:45:56.807 回答