QUESTION: Why I can't run this coding? . import java.util.*; public class Children {     String name;    int friends;    public Children(String name)    {        this.name = name;       friends = 0;    }    public void getFriend(Children k){        friends++;     }       public int numFriends() {        return friends;     }       public String playsalong(){        return "joy";     }       public String toString(){        return "a child named "+name;}    } class Girl extends Children {     public Girl(String name){        super(name);       friends = 1;     }    public void getFriend(Children k){        if (k instanceof Girl)         friends += k.numFriends( );       else       friends++;    }    public String toString( ){            return "a girl named "+ name;}    } class Boy extends Children {     public Boy(String name){         super(name);     }        public String toString(){        return "a boy named " +name; }  }

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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QUESTION: Why I can't run this coding?

.

import java.util.*;
public class Children

   String name;
   int friends;
   public Children(String name)
   { 
      this.name = name;
      friends = 0;
   }
   public void getFriend(Children k){ 
      friends++; 
   }
      public int numFriends() { 
      return friends; 
   }
      public String playsalong(){ 
      return "joy"; 
   }
      public String toString(){ 
      return "a child named "+name;}
   }

class Girl extends Children

   public Girl(String name){ 
      super(name);
      friends = 1; 
   }
   public void getFriend(Children k){ 
      if (k instanceof Girl)
 
      friends += k.numFriends( );
      else
      friends++;
   }
   public String toString( ){ 
   
      return "a girl named "+ name;}
   }


class Boy extends Children

   public Boy(String name){ 
   
   super(name); 
   }
   
   public String toString(){ 
      return "a boy named " +name; }
 }

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