获取错误：BodyMassApplet 不是抽象的，并且不会覆盖抽象方法 actionPerformed(ActionEvent)

Question

我不断收到此错误，但我似乎无法弄清楚为什么有任何想法？（不会编译） 这是从我的工作控制台应用程序构建的小程序（教育原因）。 谢谢各位...

错误：BodyMassApplet 不是抽象的，并且不会覆盖 ActionListener 中的抽象方法 actionPerformed(ActionEvent) 公共类 BodyMassApplet 扩展 Applet 实现 ActionListener

代码：

/*
        Name : ****************
        Date : 13/02/14
        Reason : Bodymass calculator
        Chapter : 3
        Programs Name : BodyMassApplet.java

*/

import java.applet.*;
import java.awt.*;
import java.awt.event.*;

public class BodyMassApplet extends Applet implements ActionListener
{
        //declare vars
        Image logo;//declare an image object
        int inches, pounds;
        double meters, kilograms, index;

        //construct components
        Label companyLabel = new Label ("THE SUN FITNESS CENTER BODY MASS INDEX CALCULATOR");
        Label heightLabel = new  Label("Enter your height to the nearest inch : ");
            TextField heightFeild = new TextField (10);
        Label weightLabel = new Label ("Enter your weight to the nearest pound : ");
            TextField weightFeild = new TextField (10);
        Button calcButton = new Button ("Calculate");
        Label outputLabel = new Label ("Click the Calculate button to see your Body Mass Index. ");

        public void init()
        {
            setForeground(Color.red);
            add(companyLabel);
            add(heightLabel);
            add(heightFeild );
            add(weightLabel);
            add(weightFeild);
            add(calcButton);
            calcButton.addActionListener(this);
            add(outputLabel);
            logo = getImage(getDocumentBase(),"log.gif");
        }//Close init method


        public void actionPerfomed(ActionEvent e)
        {
            inches = Integer.parseInt(heightFeild.getText());
            pounds = Integer.parseInt(weightFeild.getText());
            meters = inches /39.36;
            kilograms =pounds /2.2;
            index = kilograms / Math.pow(meters,2);
            outputLabel.setText("Your Body Mass Index Is" + Math.round(index)+ ".");
        }


        public void paint(Graphics g)
        {
            g.drawImage(logo,125,160,this);
        }







}//close applet class

Answer 1

这只是一个错字，你写的

public void actionPerfomed(ActionEvent e)

但你的意思是：

public void actionPerformed(ActionEvent e)

我建议使用像 Eclipse 这样的 IDE，它会向您指出这个问题。