Why do some classes require main methods and others do not?

Every Java program (which is in turn, built up from one or more Java classes) requires a Main method. The purpose of this special method is to serve as an entry point to your program so that your program can be executed. More information can be found in this page.

In your Pie example, what happens is that when you run your application, the main method will be the first thing which will be called. Once that it will be called, it will create a new Object, named newPie using the Pie template (class) and so on.

Just as extra information, if you are using an IDE, if you add a main method in your Pie class with the given signature: public static void main(String[] args), the next time you run your program the IDE will ask you to select your entry point since it will have now found two entry points. Once that you will have made your selection, the IDE will make the necessary configurations so that the entry point of your application is noted.

Related Posts:

  1. How can I design a class named allergy?
  2. What does “Could not find or load main class” mean?
  3. What does “Could not find or load main class” mean?
  4. Difference between Inheritance and Composition
  5. How do I resolve ClassNotFoundException?
  6. Java: Multiple class declarations in one file
  7. what is the difference between `public class` and just `class`?
  8. How do you make a deep copy of an object?
  9. What does .class mean in Java?
  10. What is Serialization?
  11. How to identify object types in java
  12. implicit super constructor Person() is undefined. Must explicitly invoke another constructor?
  13. What is the difference between Integer and int in Java?
  14. Java Class File Editor
  15. Polymorphism vs Overriding vs Overloading
  16. Import a custom class in Java
  17. Java The method is undefined for this type
  18. What is the difference between object-oriented languages and non object-oriented languages?
  19. java sort using anonymous class
  20. Import a custom class in Java
  21. Error: Generic Array Creation
  22. Java – get the current class name?
  23. Call a Class From another class
  24. .class vs .java
  25. What is a class constant?
  26. What is method hiding in Java? Even the JavaDoc explanation is confusing
  27. Node cannot be resolved to a type
  28. Why use getters and setters/accessors?
  29. Why is there no multiple inheritance in Java, but implementing multiple interfaces is allowed?
  30. What’s wrong with overridable method calls in constructors?
  31. incompatible types: void cannot be converted to int [duplicate]
  32. Fields in interfaces
  33. Could not find or load main class with a Jar File
  34. Class Declarations for temperature program in Java
  35. Java 8 Iterable.forEach() vs foreach loop
  36. How to round a number to n decimal places in Java
  37. Error unable to access jarfile C:\Jar
  38. In laymans terms, what does ‘static’ mean in Java? [duplicate]
  39. Sort an array in Java
  40. Java String Split by “|”
  41. Could not reserve enough space for object heap
  42. java.lang.ClassNotFoundException: com.mysql.jdbc.Driver in Eclipse
  43. “Char cannot be dereferenced” error
  44. com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
  45. Print ArrayList
  46. Unsupported major.minor version 52.0 [duplicate]
  47. What is a StringIndexOutOfBoundsException? How can I fix it?
  48. Non-static variable cannot be referenced from a static context
  49. How to get an enum value from a string value in Java
  50. What is the significance of load factor in HashMap?
  51. Which HTML Parser is the best?
  52. Returning Arrays in Java
  53. java.lang.ClassCastException
  54. org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘MyController’:
  55. Can I multiply strings in Java to repeat sequences?
  56. Why does cache use Most Recently Used (MRU) algorithm as evict policy?
  57. How to for each the hashmap?
  58. Why do I get SQLCODE=-204, SQLSTATE=42704 with DB2 LUW and WebSphere App Server?
  59. java.net.UnknownHostException: Invalid hostname for server: local
  60. HashMap get/put complexity
  61. @Autowired – No qualifying bean of type found for dependency
  62. SSH library for Java
  63. Java ArrayList replace at specific index
  64. Exception in thread “main” java.lang.OutOfMemoryError: Java heap space
  65. What is the best math library to use with java?
  66. Double decimal formatting in Java
  67. Converting JSON to XML in Java
  68. Default keystore file does not exist?
  69. The declared package does not match the expected package “”
  70. Sort a Map by values
  71. Is not an enclosing class Java
  72. FtpClient storeFile always return False
  73. Variable is accessed within inner class. Needs to be declared final
  74. Using NotNull Annotation in method argument
  75. How to implement infinity in Java?
  76. Java Does Not Equal (!=) Not Working?
  77. How do I draw a triangle?
  78. Java path..Error of jvm.cfg
  79. How to fix the compiler error in this program?
  80. “The public type <> must be defined in its own file” error in Eclipse [duplicate]
  81. How to import a jar in Eclipse
  82. Error: class X is public should be declared in a file named X.java
  83. How to Convert Int to Unsigned Byte and Back
  84. Suggestions needed: Effective Java to C source code converter
  85. Downloading a file from spring controllers
  86. Java Error Exception in thread “AWT-EventQueue-0” java.lang.StackOverflowError
  87. Write a program that reads an unspecified number of integers, determines pos, neg, total, average
  88. Parsing JSON string in Java
  89. java attempting to assign weaker access privilege error
  90. Getting a “no interface expected here” when I try to subclass ServiceConnection [duplicate]
  91. How to determine day of week by passing specific date?
  92. Python-like list comprehension in Java
  93. Java Iterator on Doubly-linked-list
  94. Why “no projects found to import”?
  95. Java Swing setting JPanel Size
  96. how to use “tab space” while writing in text file
  97. Change Name of Import in Java, or import two classes with the same name
  98. set background color: Android
  99. Class JavaLaunchHelper is implemented in two places
  100. No Main class found in NetBeans

Leave a Comment

deneme bonusu veren sitelerbahis casinomakrobetceltabetpinbahispolobetpolobet girişpinbahis girişmakrobet girişpulibet girişmobilbahis girişkolaybet giriş