Java勾股计算器修复程序
我正在尝试创建一个毕达哥拉斯计算器,我的代码如下所示Java勾股计算器修复程序,java,swing,actionlistener,Java,Swing,Actionlistener,我正在尝试创建一个毕达哥拉斯计算器,我的代码如下所示 import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.event.*; import java.text.NumberFormat; public class TrigCalc extends JPanel implements ActionListener { private JRadioButton radioHy
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.text.NumberFormat;
public class TrigCalc extends JPanel implements ActionListener {
private JRadioButton radioHyp;
private JRadioButton radioOpp;
private JRadioButton radioAdj;
private JLabel labelAdj;
private JLabel labelOpp;
private JLabel labelHyp;
private JTextField fieldAdj;
private JTextField fieldOpp;
private JTextField fieldHyp;
private JButton btnCalc;
private ButtonGroup calcMode;
public TrigCalc() {
//construct components
//label
labelAdj = new JLabel ("Adj A =");
labelOpp = new JLabel ("Opp B =");
labelHyp = new JLabel ("Hyp C =");
//textfield
fieldAdj = new JTextField (5);
fieldOpp = new JTextField (5);
fieldHyp = new JTextField (5);
//button
btnCalc = new JButton ("Calculate");
btnCalc.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e1)
{
buttonActionPerformed(e1);
}
});
//radio action
calcMode = new ButtonGroup();
radioHyp = new JRadioButton ("Hyp", false);
radioHyp.addActionListener(this);
radioOpp = new JRadioButton ("Opp", false);
radioOpp.addActionListener(this);
radioAdj = new JRadioButton ("Adj", false);
radioAdj.addActionListener(this);
calcMode.add(radioHyp);
calcMode.add(radioOpp);
calcMode.add(radioAdj);
//set components properties
fieldAdj.setEnabled (false);
fieldOpp.setEnabled (false);
fieldHyp.setEnabled (false);
btnCalc.setEnabled (false);
//adjust size and set layout
setPreferredSize (new Dimension (269, 129));
setLayout (null);
//enabled false default
fieldAdj.setEnabled (false);
fieldOpp.setEnabled (false);
fieldHyp.setEnabled (false);
btnCalc.setEnabled (false);
//add components
add (radioHyp);
add (radioOpp);
add (radioAdj);
add (labelAdj);
add (labelOpp);
add (labelHyp);
add (fieldAdj);
add (fieldOpp);
add (fieldHyp);
add (btnCalc);
//set component bounds (only needed by Absolute Positioning)
radioHyp.setBounds (200, 10, 60, 25);
radioOpp.setBounds (105, 10, 60, 25);
radioAdj.setBounds (10, 10, 55, 25);
labelAdj.setBounds (15, 40, 55, 25);
labelOpp.setBounds (15, 65, 55, 25);
labelHyp.setBounds (15, 90, 55, 25);
fieldAdj.setBounds (80, 40, 100, 25);
fieldOpp.setBounds (80, 65, 100, 25);
fieldHyp.setBounds (80, 90, 100, 25);
btnCalc.setBounds (180, 40, 75, 75);
}
public void actionPerformed(ActionEvent e) {
Object source = e.getSource();
if (radioHyp.isSelected()) {
fieldAdj.setEnabled (true);
fieldOpp.setEnabled (true);
fieldHyp.setEnabled (false);
btnCalc.setEnabled (true);
//calculation
double aValue = Double.parseDouble(fieldAdj.getText());
double bValue = Double.parseDouble(fieldOpp.getText());
double cValue = Math.sqrt(Math.pow(aValue, 2) + Math.pow(bValue, 2));
NumberFormat nf = NumberFormat.getNumberInstance();
fieldHyp.setText(nf.format(cValue));
}
else if (radioOpp.isSelected()) {
fieldAdj.setEnabled (true);
fieldOpp.setEnabled (false);
fieldHyp.setEnabled (true);
btnCalc.setEnabled (true);
//calculation
double aValue = Double.parseDouble(fieldAdj.getText());
double bValue = Double.parseDouble(fieldHyp.getText());
double cValue = Math.sqrt(Math.pow(bValue, 2) - Math.pow(aValue, 2));
NumberFormat nf = NumberFormat.getNumberInstance();
fieldOpp.setText(nf.format(cValue));
}
else if (radioAdj.isSelected()) {
fieldAdj.setEnabled (false);
fieldOpp.setEnabled (true);
fieldHyp.setEnabled (true);
btnCalc.setEnabled (true);
//calculation
double aValue = Double.parseDouble(fieldOpp.getText());
double bValue = Double.parseDouble(fieldHyp.getText());
double cValue = Math.sqrt(Math.pow(bValue, 2) - Math.pow(aValue, 2));
NumberFormat nf = NumberFormat.getNumberInstance();
fieldAdj.setText(nf.format(cValue));
}
}
public void buttonActionPerformed(ActionEvent e1) {
Object source1 = e1.getSource();
if (radioHyp.isSelected()) {
//calculation
double aValue = Double.parseDouble(fieldAdj.getText());
double bValue = Double.parseDouble(fieldOpp.getText());
double cValue = Math.sqrt(Math.pow(aValue, 2) + Math.pow(bValue, 2));
NumberFormat nf = NumberFormat.getNumberInstance();
fieldHyp.setText(nf.format(cValue));
}
else if (radioOpp.isSelected()) {
//calculation
double aValue = Double.parseDouble(fieldAdj.getText());
double bValue = Double.parseDouble(fieldHyp.getText());
double cValue = Math.sqrt(Math.pow(bValue, 2) - Math.pow(aValue, 2));
NumberFormat nf = NumberFormat.getNumberInstance();
fieldOpp.setText(nf.format(cValue));
}
else if (radioAdj.isSelected()) {
//calculation
double aValue = Double.parseDouble(fieldOpp.getText());
double bValue = Double.parseDouble(fieldHyp.getText());
double cValue = Math.sqrt(Math.pow(bValue, 2) - Math.pow(aValue, 2));
NumberFormat nf = NumberFormat.getNumberInstance();
fieldAdj.setText(nf.format(cValue));
}
}
public static void main (String[] args) {
JFrame frame = new JFrame ("TrigCalc");
frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add (new TrigCalc());
frame.pack();
frame.setVisible (true);
}
}
但是,这将生成两个名为TrigCalc.class和TrigCalc$1.class的类
问题:
1.如何修复代码使其只生成一个类?
2.如何修复代码以不使用两个操作侦听器
btnCalc.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e1)
{
buttonActionPerformed(e1);
}
});
您正在以动作侦听器的身份传入一个匿名内部类。您刚才所做的是定义一个新类,它实现了ActionListener,它是一个接口。这是生成为TrigCalc$1.class的类
因为你在那里做的是重定向到父类上的方法,你可以用
btnCalc.addActionListener(this);
为什么两个班是个问题?为什么两个动作听众是个问题?我的目的是让一节课。。。这不是问题,只是不符合我的目的。那么我如何才能将类名更改为好的而不是丑陋的TrigCalc$1?P.s.我尝试过这个代码-如果我让按钮工作,收音机就不工作,如果我让收音机工作,这个按钮不响work@jyoon-这是因为当您执行我编写的相同侦听器方法时,在这两种情况下都会调用TrigCalc上的侦听器方法。您需要查看ActionEvent的源,查看事件来自何处—收音机或按钮—并相应地采取行动。要更改类名,请定义一个命名的内部类,并将该类的实例传递给addActionListener,而不是直接创建它。谢谢您,我查找并可以定义一个新的嵌套类。非常感谢。