添加两个使用两个滑块生成的数字的Java程序

Question

我为我的java类做了这个任务,我必须使用滑块添加两个数字,而且我真的被卡住了.这是我的代码:

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener; 
import javax.swing.*;

public class slideCalculator {
JButton add,subtract;
JSlider num1st,num2nd;
JLabel answer;
public slideCalculator(){
    JFrame calc = new JFrame("Mediocre Calculator");
    num1st = new JSlider (0, 100, 0);
    num1st.setMajorTickSpacing (10);
    num1st.setMinorTickSpacing (5);
    num2nd = new JSlider (0, 100, 0);
    num2nd.setMajorTickSpacing (10);
    num2nd.setMinorTickSpacing (5);
    add = new JButton("+");
    subtract = new JButton("-");
    answer = new JLabel("");
    calc.setDefaultCloseOperation(calc.EXIT_ON_CLOSE);
    calc.setVisible(true);
    calc.setBounds(500, 200, 290, 210);
    calc.setLayout(new GridLayout(0,2,1,1));
    calc.add(new JLabel("First Number: "));
    calc.add(num1st);
    calc.add(new JLabel("Second Number: "));
    calc.add(num2nd);
    calc.add(new JLabel("Answer: "));
    calc.add(answer);
    calc.add(add);
    calc.add(subtract);
    add.addActionListener(new action());
    subtract.addActionListener(new action());

}
public static void main(String[] args) {
    slideCalculator lc = new slideCalculator();
}
public class action implements ActionListener {
    public void actionPerformed(ActionEvent ae) {
        int firstNum = Integer.parseInt(num1st.getValue());
        int secondNum = Integer.parseInt(num2nd.getValue());
        if(ae.getValue()== add){
            answer.setText(String.valueOf(firstNum+secondNum));
        }
        else if (ae.getValue()==subtract){
            answer.setText(String.valueOf(firstNum-secondNum));
        }
        } 

}
}

当我去运行它时,它不想工作.我可能错过了一些东西,但我似乎无法弄明白.我甚至对任何一个都纠正了吗？

Answer 1

这个:

public void actionPerformed(ActionEvent ae) {
    int firstNum = Integer.parseInt(num1st.getValue());
    int secondNum = Integer.parseInt(num2nd.getValue());
    if(ae.getValue()== add){  // *****

没有意义.拍摄 - 它甚至没有编译,因为ActionEvent没有getValue()方法.你没有获得ActionEvent的"值",而是通过它得到它的actionCommand String getActionCommand(),然后你可以使用String equals(...)或equalsIgnoreCase(...)方法将它与其他字符串进行比较.

即

if ("+".equals(ae.getActionCommand()) {
   // do addition
} else if ("-".equals(ae.getActionCommand()) {
   // do subtraction
}

在以后的问题中,请发布您遇到的所有编译器错误.