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/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
class abstract Container<C extends Container<C,N>, N extends Node<C,N>> {
	private List<N> nodes;
	public Container() {
		this.nodes = new LinkedList<>();
	}
}
 
class abstract Node<C extends Container<C,N>, N extends Node<C,N>> {
    private C owner;
    public Node(L owner){
    	this.owner = owner;
    	owner.nodes.add(this);
    }
}
 
class ContainerA extends Container<ContainerA, NodeA>{
	public ContainerA(){
		super();
	}
}
class NodeA extends Node<ContainerA, NodeA>{
	public NodeA(ContainerA owner){
		super(owner);
	}
}
 
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		ContainerA ca = new ContainerA();
		NodeA na = new NodeA(ca);
	}
}

Main.java:7: error: <identifier> expected
class abstract Container<C extends Container<C,N>, N extends Node<C,N>> {
     ^
Main.java:7: error: > expected
class abstract Container<C extends Container<C,N>, N extends Node<C,N>> {
                           ^
Main.java:7: error: ';' expected
class abstract Container<C extends Container<C,N>, N extends Node<C,N>> {
                                  ^
Main.java:7: error: illegal start of type
class abstract Container<C extends Container<C,N>, N extends Node<C,N>> {
                                                 ^
Main.java:7: error: '(' expected
class abstract Container<C extends Container<C,N>, N extends Node<C,N>> {
                                                   ^
Main.java:7: error: illegal start of type
class abstract Container<C extends Container<C,N>, N extends Node<C,N>> {
                                                     ^
Main.java:7: error: ';' expected
class abstract Container<C extends Container<C,N>, N extends Node<C,N>> {
                                                                 ^
Main.java:7: error: > expected
class abstract Container<C extends Container<C,N>, N extends Node<C,N>> {
                                                                     ^
Main.java:7: error: <identifier> expected
class abstract Container<C extends Container<C,N>, N extends Node<C,N>> {
                                                                       ^
Main.java:8: error: '(' expected
	private List<N> nodes;
	^
Main.java:9: error: invalid method declaration; return type required
	public Container() {
	       ^
Main.java:14: error: <identifier> expected
class abstract Node<C extends Container<C,N>, N extends Node<C,N>> {
     ^
Main.java:14: error: > expected
class abstract Node<C extends Container<C,N>, N extends Node<C,N>> {
                      ^
Main.java:14: error: ';' expected
class abstract Node<C extends Container<C,N>, N extends Node<C,N>> {
                             ^
Main.java:14: error: illegal start of type
class abstract Node<C extends Container<C,N>, N extends Node<C,N>> {
                                            ^
Main.java:14: error: '(' expected
class abstract Node<C extends Container<C,N>, N extends Node<C,N>> {
                                              ^
Main.java:14: error: illegal start of type
class abstract Node<C extends Container<C,N>, N extends Node<C,N>> {
                                                ^
Main.java:14: error: ';' expected
class abstract Node<C extends Container<C,N>, N extends Node<C,N>> {
                                                            ^
Main.java:14: error: > expected
class abstract Node<C extends Container<C,N>, N extends Node<C,N>> {
                                                                ^
Main.java:14: error: <identifier> expected
class abstract Node<C extends Container<C,N>, N extends Node<C,N>> {
                                                                  ^
Main.java:15: error: '(' expected
    private C owner;
    ^
Main.java:16: error: invalid method declaration; return type required
    public Node(L owner){
           ^
22 errors

Standard output is empty