java - Dr. Java 中的多个类

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类放在一个文件中，而将主类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

• 在一个文件中你只能有一个公共(public)类，而多个非公开课
• 您的文件名必须与唯一公开的相匹配类
• 要使您的类可运行，它应该包含一个public staticvoid main(String args[])方法，最好在public类中

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:如果你想保留文件名 Test.java，这也有效:

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();

    }
}