驱动程序和方法似乎不能一起工作

Question

我有一个学校项目，我们需要创建一个程序将数字转换为二进制，但我似乎无法让它们一起工作。他们会编译，但实际上不会得到正确的答案，我的 toString() 方法有效，它只是没有获取用户输入的十进制或从 ConvertToBinary 中获取的二进制文件，所以我不确定它在哪里失败。任何帮助都会很棒。驱动程序和方法如下！谢谢！

司机：

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

class DecimalConverter extends JPanel{

//Sets up the Window

public DecimalConverter(){ 

  JFrame window = new JFrame("Binary To Decimal");

  //exit program when window closes

  window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

  //WINDOW COMPONENETS:

  JLabel lblPrompt = new JLabel("Enter your number to convert: ");

  JLabel lblBinary = new JLabel("Binary: ");

  JTextField txtDecimal = new JTextField();

  JButton btnToBinary = new JButton("To Binary");

  //SET POSITIONS

  lblPrompt.setBounds(40, 40, 200, 30);

  txtDecimal.setBounds(250, 40, 100, 30);

  lblBinary.setBounds(40, 80, 300, 30);

  btnToBinary.setBounds(250, 120, 100, 30);

  setLayout(null);

  add(lblPrompt);

  add(txtDecimal);

  add(lblBinary);

  add(btnToBinary);

  window.add(this);

  window.setSize(400, 200);

  window.setVisible(true);

  //Event for button

  btnToBinary.addActionListener(new ActionListener(){

     public void actionPerformed(ActionEvent e){

        String str = txtDecimal.getText();

           DecimalBinary b = new DecimalBinary();               

           lblBinary.setText(b.toString());

        }//ends Action Performed

     }//Ends ActionListener

  );//End Event

 }//End Constructor

 public static void main(String args[]){

  new DecimalConverter();

}//ends main

}//End Class

方法：

class DecimalBinary{

private String decimal = "0";

private String binary = "";

private int dec;

public void setDecimal(String decimal){

 int dec = Integer.parseInt(decimal);

 convertToBinary(dec);

}

public String convertToBinary(int dec){

 int pow = 128;

 while (dec > 0){

    if (dec >= pow){

      binary += "1";

      dec = dec - pow;

    } 

    else if (dec < pow){

        binary += "0";

    }

 pow = pow / 2;

 }

 return decimal;

}

  public String  toString(){

  return decimal + " is " + binary + " in binary";

  }

 }

Answer 1

更改您的代码如下 ( // added)public void setDecimal(String decimal){&nbsp;this.decimal = decimal // added&nbsp;int dec = Integer.parseInt(decimal);&nbsp;convertToBinary(dec);}public void actionPerformed(ActionEvent e){&nbsp; &nbsp; String str = txtDecimal.getText();&nbsp; &nbsp; DecimalBinary b = new DecimalBinary();&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; &nbsp; b.setDecimal(str) // added&nbsp; &nbsp; lblBinary.setText(b.toString());}//ends Action Performed