Private Static Void String

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private static void Main ( string [ ] args )
      string [ ] names = new [ ] { "Иван" , "Петр" , "Дмитрий" , "Матвей" , "Владимир" } ;
      Random r = new Random ( ) ;
      List < Student > students = new List < Student > ( ) ;
      for ( int i = 0 ; i < 10 ; i ++ )
        students . Add ( new Student ( names [ r . Next ( 0 , 5 ) ] ) ) ;
      Group group = new Group ( "Тестовая группа" , students ) ;
      //выводит имя студента + среднюю оценку
      group . Students . ForEach ( student => Console . WriteLine ( student . Name + " " + student . AverageScore ) ) ;
      group . WriteAllWeakStudents ( ) ;
      Console . ReadKey ( ) ;
      public string Name { get ; set ; }
      public void Greeting ( )
        Console . WriteLine ( $ "My name is {0}" , Name ) ;
    private class Student : Person
      public Student ( string name )
        Name = name ;       
        GenerateRandomGrades ( ) ;
      public List < int > Grades { get ; set ; }
      public int AverageScore
        get { return Convert . ToInt32 ( Grades . Average ( ) ) ; }
      //создает рандомные оценки
      private void GenerateRandomGrades ( )
        Random r = new Random ( ) ;
        Grades = new List < int > ( ) ;
        for ( int i = 0 ; i < 10 ; i ++ )
          Grades . Add ( r . Next ( 2 , 6 ) ) ;
      public bool IsWeak => AverageScore < 4 ;
      //выводит все оценки студента
      public void WriteAllGrades ( )
        Grades . ForEach ( grade => Console . Write ( grade + ", " ) ) ;
      public Group ( string name, List < Student > students )
        Students = students ;
      public string Name { get ; }
      public List < Student > Students { get ; }
      public void WriteAllWeakStudents ( )
        Console . WriteLine ( "Список неуспевающих студентов(у которых средняя оценка <3):" ) ;
        Students . FindAll ( student => student . IsWeak ) . ForEach ( student => Console . WriteLine ( student . Name ) ) ;

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Difficulty Level :
Easy Last Updated :
25 Aug, 2020
    public static void main(String[] args)
        System.out.println( "I am a Geek" );
    private static void main(String[] args)
        System.out.println( "I am a Geek" );
    public void main(String[] args)
        System.out.println( "I am a Geek" );
    public static int main(String[] args)
        System.out.println( "I am a Geek" );
    public static void myMain(String[] args)
        System.out.println( "I am a Geek" );
    public static void main(String[] args)
            System.out.println(elem);
    public static int main(String[] args) {
        System.out.println( "GeeksforGeeks" );
    public static int main(String[] args) {
        System.out.println( "GeeksforGeeks" );
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In Java programs, the point from where the program starts its execution or simply the entry point of Java programs is the main() method. Hence, it is one of the most important methods of Java and having proper understanding of it is very important.
Most common syntax of main() method:
Explanation: Every word in the public static void main statement has got a meaning to the JVM.
Apart from the above mentioned signature of main, you could use public static void main(String args[]) or public static void main(String… args) to call the main function in java. The main method is called if it’s formal parameter matches that of an array of Strings.
Can main method be int? If no, why?
Java does not return int implicitly, even if we declare return type of main as int. We will get compile time error
prg1.java:6: error: missing return statement } ^ 1 error
Now, even if we do return 0 or integer explicitly ourselves, from int main. We get run time error.
Error: Main method must return a value of type void in class GeeksforGeeks, please define the main method as: public static void main(String[] args)
Explanation – The C and C++ programs which return int from main are processes of Operating System. The int value returned from main in C and C++ is exit code or exit status . The exit code of C or C++ program illustrates, why the program terminated. Exit code 0 means successfull termination. However, non zero exit status indicates error. Eg, exit code 1 depicts Miscellaneous errors, such as “divide by zero”
Parent process of any child process keeps waiting for exit status of child. And after receiving the exit status of child, cleans up the child process from process table and frees the resources allocated to it. Which is why it becomes mandatory for C and C++ programs(which are prcoesses of OS) to pass its exit status from main explicitly or implicitly.
However, The java program runs as ‘main thread’ in JVM. The Java program is not even a process of Operating System directly. There is no direct interaction between Java program and Operating System. There is no direct allocation of resources to Java program directly, or the Java program does not occupy any place in process table. Whom should it return exit status to, then. Which is why main method of Java is designed not to return int or exit status.
But JVM is a process of a operating system, and JVM can be terminated with certain exit status. With help of java.lang.Runtime.exit(int status) or System.exit(int status)
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