[英]Binary to Decimal Applet with radio buttons
我正在嘗試創建一個將二進制轉換為十進制,十進制轉換為二進制的applet。 我已經編寫了每個人的小程序,但現在我想創建一個使用單選按鈕選擇用戶想要進行的轉換,然后讓轉換按鈕執行轉換。 我現在卡住了,不太確定從哪里開始...它目前沒有編譯。
我還希望包含一個向上或向下指向的箭頭,具體取決於所選的單選按鈕...我已經嘗試將所述箭頭的Unicode實現為JLabel,但是他們不接受字符,怎么會這樣呢?
非常感謝任何幫助,非常感謝。
繼承了我目前一堆亂糟糟的代碼......
編輯:
import java.util.Scanner;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.text.DecimalFormat;
public class binaryAndDecimalConvert extends JApplet
{
private JPanel bPanel;
private JPanel dPanel;
private JPanel buttonPanel;
private JPanel radioPanel;
private JPanel arrowPanel;
private JLabel arrowUp;
private JLabel arrowDown;
private JTextField binaryTxt;
private JTextField decimalTxt;
private ButtonGroup radioButtonGroup;
private JRadioButton binaryConvButton;
private JRadioButton decimalConvButton;
public void init()
{
Font font = new Font("display font", Font.BOLD, 15);
//build the panels
buildBpanel();
buildArrowPanel();
buildDpanel();
buildButtonPanel();
buildRadioPanel();
//create Layout Manager.
setLayout(new GridLayout(5, 1));
// Add the panels to the content pan.
add(bPanel);
add(arrowPanel);
add(dPanel);
add(buttonPanel);
add(radioPanel);
}
private void buildDpanel()
{
dPanel = new JPanel();
dPanel.setBackground(Color.pink);
JLabel message2 = new JLabel("Decimal Number: ");
decimalTxt = new JTextField(15);
dPanel.setLayout(new FlowLayout(FlowLayout.LEFT));
dPanel.add(message2);
dPanel.add(decimalTxt);
}
private void buildBpanel()
{
//create the panel
bPanel = new JPanel();
bPanel.setBackground(Color.pink);
//create a label to display a mssage
JLabel message1 = new JLabel("Binary Number: ");
//create a text field for the binary number
binaryTxt = new JTextField(15);
//create a layout manager for the panel
bPanel.setLayout(new FlowLayout(FlowLayout.LEFT));
///add the label and text field to the panel
bPanel.add(message1);
bPanel.add(binaryTxt);
}
public void buildRadioPanel()
{
radioPanel = new JPanel();
radioPanel.setBackground(Color.pink);
binaryConvButton = new JRadioButton("Binary to Decimal");
decimalConvButton = new JRadioButton("Decimal to Binary");
radioButtonGroup = new ButtonGroup();
radioButtonGroup.add(binaryConvButton);
radioButtonGroup.add(decimalConvButton);
binaryConvButton.addActionListener(new RadioButtonListener());
decimalConvButton.addActionListener(new RadioButtonListener());
binaryConvButton.addActionListener(new RadioButtonListener());
decimalConvButton.addActionListener(new RadioButtonListener());
radioPanel.add(binaryConvButton);
radioPanel.add(decimalConvButton);
binaryConvButton.setEnabled(true);
}
public void buildArrowPanel()
{
arrowPanel = new JPanel();
arrowUp = new JLabel("\u2191");
arrowDown = new JLabel("\u2193");
arrowPanel.setBackground(Color.pink);
arrowPanel.add(arrowDown);
}
private class RadioButtonListener implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
if(e.getSource() == binaryConvButton)
{
arrowPanel.add(arrowUp);
}
else if(e.getSource() == decimalConvButton)
arrowPanel.add(arrowDown);
}
}
private void buildButtonPanel()
{
buttonPanel = new JPanel();
buttonPanel.setBackground(Color.pink);
JButton convButton = new JButton("Convert");
convButton.addActionListener(new ButtonListener());
buttonPanel.add(convButton);
}
private class ButtonListener implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
//binary to decimal conversion
String decimalNum= "";
int decimal1 = 0;
String binaryNum = "";
int power = 1;
int dec;
if(e.getSource() == decimalConvButton)
{
binaryNum=binaryTxt.getText();
for(int i = 1; i <= binaryNum.length(); i++)
{
if(binaryNum.charAt(binaryNum.length()-i) == '1')
{
decimal1 = (decimal1 + power);
}
power = (power*2);
}
decimalNum = Integer.toString(decimal1);
decimalTxt.setText(decimalNum);
}
//decimal to binary
if(e.getSource() == binaryConvButton)
{
dec = Integer.parseInt(decimalTxt.getText());
while (dec != 0)
{
binaryNum = (dec % 2) + binaryNum;
dec /= 2;
}
binaryTxt.setText(binaryNum);
}
}
}
}
你遇到的一個問題是,你正在重新聲明一個方法中的一個類字段,並有效地“遮蔽”該字段使其不可見。 該字段是“二進制”
這是您最初聲明的地方:
public class BinaryAndDecimalConvert extends JApplet {
private JPanel bPanel;
//...
private JTextField binary;
這是你影子的地方:
private class ButtonListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
String decimalNum = "";
int decimal1 = 0;
String binaryNum = "";
int power = 1;
String binary; // **** redeclared here ****
if (binaryToDec = true) {
binaryNum = binary.getText(); // so this won't work
解決方案:不要將方法的變量賦予與重要類字段同名的方法。
接下來,您嘗試在String變量binaryNumber上調用setText()
:
binaryNumber.setText(decimal1);
String沒有這樣的方法,所以擺脫這個方法調用。
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.