public class Developer
{
String Name;
String Language;
int Years;
int Age;

void Company ()
{
  System.out.println (Name + " Codes in " + Language + " & has " + Years +
          " Years of experience" + ", He is " + Age + " Old");
}

public Developer ()
{
  System.out.println ("Hello");
}

public Developer (String Name, String Language, int Years, int Age)
{
  this ();
  this.Name = Name;
  this.Language = Language;
  this.Years = Years;
  this.Age = Age;
}
 }

 public class Analyst extends Developer {

    public Analyst (String Name, String Language, int Years, int Age){
        super (Name, Language, Years, Age);
      }

    public static void main (String[]args){

    Developer d1 = new Developer ();
    d1.Name = "John";
    d1.Language = "Java";
    d1.Years = 2;
    d1.Age = 22;

    Developer d2 = new Developer ("Doe", "C++", 3, 23);

    d1.Company ();
    d2.Company ();

    Analyst A1 = new Analyst ("Doe", "C++", 3, 23);
    A1.Company ();
      }

    }

您不能使用 static 关键字，除非它是内部类。一 static 内部类是一个嵌套类，它是 static 外层阶级的成员。

public class Outer {
   static class InnerStaticClass {
      public void example() {
         System.out.println("This is static nested class");
      }
   }
   public static void main(String args[]) {
      Outer.InnerStaticClass nestedClass = new Outer.InnerStaticClass();
      nestedClass.example();
   }
}