未找到主要方法、小程序或 MIDlet (No main methods, applets, or MIDlets found)

問題描述

未找到主要方法、小程序或 MIDlet (No main methods, applets, or MIDlets found)

當我運行此程序時，會出現一個彈出窗口，告訴我沒有找到主要方法、小程序或 MIDlet。有人可以告訴我為什麼嗎？‑‑我正在使用 jGrasp。我正在嘗試使用 main 方法，但我之前沒有遇到過這個問題。

import java.util.*;
import java.io.*;


public class ProgrammingExercise3.1
{
   public static void main(String[] args);
   {

      double rectWidth;
      double rectLength;
      double radius;
      int age;
      double begBal;
      char A;
      String name;
      double rate;

      scanner inFile = new Scanner(new FileReader("C:\\Users\\sierr_000\\Desktop\\Sam School\\IT‑145\\Exercises\\Ch 3\\inData.txt"));

      PrintWriter outFile = new PrintWriter("C:\\Users\\sierr_000\\Desktop\\Sam School\\IT‑145\\Exercises\\Ch 3\\outData.out");

      rectWidth = inFile.next();
      rectLength = inFile.next();

      outFile.println("Rectangle: ")
      outFile.println("Length = " + rectLength + ", width = " + rectWidth + ", area = "
                     + (rectWidth*rectLength) + ", perimeter = " + (2 * (rectwidth + rectLengh)));

      radius = inFile.next();

      outFile.println("Circle: ");
      outfile.println("Radius = " + radius + ", area = " + (radius*3.1416) + "Circumfrence = " + (2*3.1416*radius));

      name = inFile.next();
      age = inFile.next();
      begBal = inFile.next();
      rate = inFile.next();

      outFile.println("Name: " + name + ", age: " + age);
      outFile.printf("Beginning Balance: %7.2f" , begBal + "interest rate: %4.2f" , rate);
      outFile.println("The character that comes after A in the ASCII is B");      




      inFile.close();
      outFile.close();

   }
}   

參考解法

方法 1:

This seems to be full of errors, but the main reason you are getting that error is that you put a semicolon after public static void main(String[] args).

(by Samuel Wyatt Cassady、ACCFfan)

參考文件

1. No main methods, applets, or MIDlets found (CC BY‑SA 2.5/3.0/4.0)