/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* 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
	{
		List<Foo> foos = Arrays.asList(new Foo(7));
		System.out.printf("%b%n", foos.contains(new Bar(7)));
	}
 
	private static class Foo {
		private final int x;
 
		public Foo(int x) {
			this.x = x;
		}
 
		@Override
		public boolean equals(Object other) {
			if (!(other instanceof Foo)) {
				return false;
			}
			return this.x == ((Foo)other).x;
		}
	}
 
	private static class Bar extends Foo {
		public Bar(int x) {
			super(x);
		}
	}
}

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