带有 StackOverflowError 的 Swing 计时器和 ActionListener

Question

我得到了一个我尝试了很长时间的作业，甚至向教授询问了它，但仍然不明白这段代码出了什么问题。我完全不知道如何初始化时间（在 SoilTempData 构造函数中），也不确定错误有什么问题，所以我不知道如何修复它。由于保留给定代码结构的问题，我也不能太多更改代码 [这是给定的图表][1]

package Iot;
import java.util.ArrayList;
import javax.swing.Timer;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class SoilTempData implements ActionListener{
    private final int REPORT_ROUND = 1000/100;
    ArrayList<Integer> data;
    private int round;
    private int nextPrintIndex;
    private Timer time;
    private SoilTempIoT iot;
    public SoilTempData(SoilTempIoT iot){
        data = new ArrayList<>(10);
        round = 0;
        nextPrintIndex = 0;
        time = new Timer(100, new SoilTempData(iot));
        iot = new SoilTempIoT();
    }
    public void start() {
        time.start();
    }
    public void actionPerformed(ActionEvent e){
        if(!(round == REPORT_ROUND))
            time.start();
        else
            printStat();
    }
    public void printStat() {
        int min = data.get(nextPrintIndex);
        int max = data.get(nextPrintIndex);
        int sum = 0;
        double average = 0.0;
        double sd = 0.0;
        System.out.println("********** Report Current Data: **********");
        System.out.print("New set of data: ");
        for(int i = nextPrintIndex ; i < data.size() ; i++) {
            System.out.print(data.get(i) +", ");
            sum += data.get(i);
            round++;
        }
        average = sum/data.size();
        for(int i = nextPrintIndex ; i < data.size() ; i++) {
            sd += Math.pow((data.get(i) - average),2);
        }
        System.out.printf("\nTotal records: %d\n",REPORT_ROUND*round);
        System.out.println("Statistics:");
        if(!data.isEmpty()) {
            System.out.printf("Min = %.2f\nMax = %.2f\nAverage = %.2f\nSD = %.2f\n",min,max,average,sd);
        }
        else
            System.out.println("No data to report!");
        nextPrintIndex = REPORT_ROUND*round;
    }
}

这是 SoilTempIoT

package Iot;

import java.awt.event.ActionListener;
import java.util.Random;

public class SoilTempIoT {
    public static final int MIN_TEMP = 10;
    public static final int MAX_TEMP = 60;
    private int temp;
    private Random rand;
    public SoilTempIoT() {
        rand = new Random();
        temp = rand.nextInt(50) + 10;
    }
    public int getTemp() {
        int i = rand.nextInt(21) - 10;
        return temp+i;
    }
}

和 Main class（由于问题无法更改任何内容，但万一有人想看一下）

package Iot;
import javax.swing.JOptionPane;

public class SoilTempDataTest {
    public static void main(String[] args) {
        SoilTempData sensor = new SoilTempData(new SoilTempIoT());
        sensor.printStat();
        sensor.start();
        JOptionPane.showMessageDialog(null, "Quit?");
        System.exit(0);
    }
}

如果我的问题有任何不好的地方请告诉我，我会加班改进。

编辑：我还需要这样做，以便 SoilTempData 从 SoilTempIoT 100ms 读取数据，并且每 1000ms 打印一次 Stat。 [1]: https://i.stack.imgur.com/VDefv.png

Answer 1

   public SoilTempData(SoilTempIoT iot){
       data = new ArrayList<>(10);
       round = 0;
       nextPrintIndex = 0;
       time = new Timer(100, new SoilTempData(iot));
       iot = new SoilTempIoT();
   }

当您初始化 time 时，您创建了另一个实例。调用相同的构造函数，初始化 time，创建另一个实例，等等

只需使用time = new Timer(100, this);

带有 StackOverflowError 的 Swing 计时器和 ActionListener

Swing Timer and ActionListener with StackOverflowError

java

swing

timer

actionlistener