Question

我正在研究JAVA中的一个简单的计算器，因为我试图尝试使用GUI。我遇到了一些仍未通过调试器解决的错误..

计算器上代表*， - 等等的按钮不能正常工作，唯一正常工作的按钮是正常工作的加号按钮。

除法按钮从不输出任何内容，它会输出一个错误，表示它不能被零除。这是最奇怪的一个，因为如果保存的输入或数字为零，肯定会影响加号答案，但事实并非如此。

乘法按钮输出零作为答案而减号按钮将两个数字相加而不是从另一个中减少一个......

如果有人看到上述任何问题的原因，请告诉我..

 import javax.swing.*;
 import java.awt.*;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;

  //Version 1.0

 public class App {
  private JLabel txt;
  private JPanel main;
  private JButton one;
  private JButton three;
  private JButton nine;
  private JButton seven;
  private JButton eight;
  private JButton two;
  private JButton four;
  private JButton six;
  private JButton clear;
  private JButton min;
  private JButton div;
  private JButton times;
  private JButton zero;
  private JButton five;
  private JButton button1;
  private JButton plus;

//Variables are declared
int num1;
int num2;
int ans;

boolean kms = false;

int input;
/* boolean multiplication = false;
boolean division = false;
boolean subtract = false;
boolean addition = false;*/

public App() {

    txt.setText("0");


    times.addActionListener(new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {
            txt.setText("*");
            input = 1;
            kms = true;
        }
    });

    div.addActionListener(new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {
            txt.setText("/");
            kms = true;
            input = 2;
        }
    });

    min.addActionListener(new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {
            txt.setText("-");
            kms = true;
            input = 3;
        }
    });

    plus.addActionListener(new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {
            txt.setText("+");
            kms = true;
            input = 4;
        }
    });

    clear.addActionListener(new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {
            ans = 0;
            num1 = 0;
            num2 = 0;
            txt.setText("");
        }
    });

    if(kms == true){

        //Second number being inputted
        num1 = Integer.parseInt(txt.getText());
        txt.setText("");

        one.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                txt.setText(txt + "1");
                num2 = num2 + 1;

            }
        });
        two.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                txt.setText("2");
                num2 = num2 + 2;
            }
        });
        three.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                txt.setText("3");
                num2 = num2 + 3;
            }
        });
        four.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                txt.setText("4");
                num2 = num2 + 4;
            }
        });
        five.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                txt.setText("5");
                num2 = num2 + 5;
            }
        });
        six.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                txt.setText("6");
                num2 = num2 + 6;
            }
        });
        seven.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                txt.setText("7");
                num2 = num2 + 7;
            }
        });
        eight.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                txt.setText("8");
                num2 = num2 + 8;
            }
        });
        nine.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                txt.setText("9");
                num2 = num2 + 9;
            }
        });
        zero.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                txt.setText("0");
                num2 = num2 + 0;
            }
        });

        num2 = Integer.parseInt(txt.getText());

    }else if(kms == false){
        //First number being inputted
        one.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                txt.setText("1");
                num1 = num1 + 1;
            }
        });
        two.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                txt.setText("2");
                num1 = num1 + 2;
            }
        });
        three.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                txt.setText("3");
                num1 = num1 + 3;
            }
        });
        four.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                txt.setText("4");
                num1 = num1 + 4;
            }
        });
        five.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                txt.setText("5");
                num1 = num1 + 5;
            }
        });
        six.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                txt.setText("6");
                num1 = num1 + 6;
            }
        });
        seven.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                txt.setText("7");
                num1 = num1 + 7;
            }
        });
        eight.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                txt.setText("8");
                num1 = num1 + 8;
            }
        });
        nine.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                txt.setText("9");
                num1 = num1 + 9;
            }
        });
        zero.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                txt.setText("0");
                num1 = num1 + 0;
            }
        });

        num2 = Integer.parseInt(txt.getText());

        button1.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                switch(input){
                    case 1:
                        ans = num1 * num2;
                        txt.setText("Answer is " + ans);
                    break;
                    case 2:
                        ans = num1 / num2;
                        txt.setText("Answer is " + ans);
                    break;
                    case 3:
                        ans = num1 - num2;
                        txt.setText("Answer is " + ans);
                    break;
                    case 4:
                        ans = num1 + num2;
                        txt.setText("Answer is " + ans);
                    break;
                }
            }
        });


    }
}




public static void main(String[] args) {

    JFrame frame = new JFrame("Calculator");
    frame.setBackground(Color.white);
    frame.setVisible(true);
    frame.setExtendedState(JFrame.MAXIMIZED_BOTH);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setContentPane(new App().main);
    frame.pack();
}

}

Answer 1

根据您在上面的代码中所做的，如果输入只有一位数的整数，它将完美地运作。

例如：然后添加5 num1=5然后按+按钮，然后kms为true，然后输入6和num2=6现在，如果按result结果将是11。

但是，如果您尝试在结果前输入另一个数字，则此输入的数字将添加到num2，如num2 = num2 + newAddedDigit，而不是连接到num2

因此，为了获得计算器的真实功能，请尝试连接按下num1和num2

的数字按钮

Java计算器错误

1 个答案: