Question

java求解：帮忙怎么解决下面的问题，具体些，谢谢！

import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.JLabel;

class Callator extends JFrame implements ActionListener {
JLabel jl1, jl2, jl3;
JTextField jt1, jt2, jt3;
JButton jb1, jb2, jb3, jb4;

Callator() {
jl1 = new JLabel("数值一：");
jl2 = new JLabel("数值二：");
jl3 = new JLabel("数值三：");
jt1 = new JTextField(5);
jt2 = new JTextField(5);
jt3 = new JTextField(5);
jt3.setEditable(false);
JPanel jp1 = new JPanel(new GridLayout(3, 2));
jp1.add(jl1);
jp1.add(jt1);
jp1.add(jl2);
jp1.add(jt2);
jp1.add(jl3);
jp1.add(jt3);
jb1 = new JButton("+");
jb2 = new JButton("-");
jb3 = new JButton("*");
jb4 = new JButton("/");
JPanel jp2 = new JPanel();
jp2.add(jb1);
jp2.add(jb2);
jp2.add(jb3);
jp2.add(jb4);
add(jp1);
add(jp2, BorderLayout.SOUTH);
jb1.addActionListener(this);
jb2.addActionListener(this);
jb3.addActionListener(this);
jb4.addActionListener(this);
}

public void actionPerforemed(ActionEvent e) {
String s1 = jt1.getText();
String s2 = jt2.getText();
Double d1 = new Double(s1);
double num1 = d1.doubleValue();
double num2 = new Double(s2);
double total = 0;
if (e.getSource() == jb1)
total = num1 + num2;
else if (e.getSource() == jb2)
total = num1 - num2;
else if (e.getSource() == jb3)
total = num1 * num2;
else if (e.getSource() == jb4)
total = num1 / num2;
String s3 = (new Double(total)).toString();
jt3.setText(s3);
}
}

public class Test11 {
public static void main(String[] args) {
Callator f = new Callator();
f.setSize(200, 150);
f.setLocation(333, 333);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setVisible(true);
}
}
编译后出现这句话：
The type Callator must implement the inherited abstract method ActionListener.actionPerformed(ActionEvent)
求解决方法。

Answer 1

你的代码是没错的。

public void actionPerforemed(ActionEvent e) {
你自己看下你的这个事件
public void actionPerformed(ActionEvent e) {
和我的有什么区别。。你换做我的试试。

哈哈 是你打错了事件名字

Answer 2

实现的方法名actionPerforemed写错了，是actionPerformed。这种错误预编译都不会通过