多个类博士 Java

Question

JDK 编译器说它可以编译，但是当它运行时我得到这个错误：

Static Error: This class does not have a static void main method accepting String[].

我习惯于将我的方法 class 放在一个文件中，而将主要的 class 放在一个单独的文件中。

我该如何解决这个问题？

    import java.util.Scanner;

public class Test{
  private final int classSize = 35;
  private int numEnrolled, numNeeded; 

  public void Input(){
   Scanner in = new Scanner(System.in);
   System.out.println("Enter the amount enrolled in your class");
   numEnrolled = in.nextInt();
   System.out.println("Your input is " + numEnrolled);       

   // Other parts of code that needs to be coded 
  }
}

class testRunner{
  static void main(String args[]){
    Test newTest = new Test();
    newTest.Input();

 }}

Answer 1

一个文件只能有一个publicclass，多个非public classes
您的文件名必须与唯一的 public class
要使您的 class 可运行，它应该包含一个 public 静态 void main(String args[])方法，最好在publicclass

你的 TestRunner.java 应该是这样的

class Test{
    private final int classSize = 35;
    private int numEnrolled, numNeeded;

    public void Input(){
        Scanner in = new Scanner(System.in);
        System.out.println("Enter the amount enrolled in your class");
        numEnrolled = in.nextInt();
        System.out.println("Your input is " + numEnrolled);

        // Other parts of code that needs to be coded
    }
}

public class TestRunner{
    public static void main(String args[]){
        Test newTest = new Test();
        newTest.Input();

    }}

编辑：如果你想留下文件名Test.java，这也行：

public class Test {
    private final int classSize = 35;
    private int numEnrolled, numNeeded;

    public void Input() {
        Scanner in = new Scanner(System.in);
        System.out.println("Enter the amount enrolled in your class");
        numEnrolled = in.nextInt();
        System.out.println("Your input is " + numEnrolled);

        // Other parts of code that needs to be coded
    }
}

class TestRunner {
    public static void main(String args[]) {
        Test newTest = new Test();
        newTest.Input();

    }
}

Answer 2

变化：

class testRunner{
  static void main(String args[]){
    Test newTest = new Test();
    newTest.Input();

 }}

至：

public class testRunner {
  public static void main(String args[]) {
    Test newTest = new Test();
    newTest.Input();
}}

main() 必须始终声明为 public

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