gistfile1.txt

package tp3;

public abstract class Set {

	public abstract boolean contains(int n);
	
	public Set even() {
		// TODO implement
		return null;
	}
	
	public Set intersection(final Set that) {
		return new IntersectionSet(this, that);
	}
	
	public Set union(final Set that) {
//		final Set parent = this;
//		
//		return new Set() {
//			@Override
//			public boolean contains(int n) {
//				return parent.contains(n) || that.contains(n);
//			}
//		};
		
		return new UnionSet(this, that);
	}
	
}



package tp3;

public class IntersectionSet extends Set {

	private final Set s1;
	private final Set s2;
	
	public IntersectionSet(Set s1, Set s2) {
		super();
		this.s1 = s1;
		this.s2 = s2;
	}

	@Override
	public boolean contains(int n) {
		return s1.contains(n) && s2.contains(n);
	}

}



package tp3;

public class UnionSet extends Set {

	private final Set s1;
	private final Set s2;
	
	public UnionSet(Set s1, Set s2) {
		super();
		this.s1 = s1;
		this.s2 = s2;
	}

	@Override
	public boolean contains(int n) {
		return s1.contains(n) || s2.contains(n);
	}

}



package tp3;

import static org.junit.Assert.*;

import org.junit.Test;

public class SetTest {

	@Test
	public void test() {
		
		Set s1 = new SingletonSet(1);
		assertTrue(s1.contains(1));
		assertFalse(s1.contains(0));
		
		Set s2 = new SingletonSet(2);
		Set s12 = s1.union(s2);
		assertTrue(s12.contains(1));
		assertTrue(s12.contains(2));
		
		
	}

}


package tp3;

class SingletonSet extends Set {
	private int number;

	public SingletonSet(int number) {
		this.number = number;
	}
	
	public boolean contains(int n) {
		return n == number;
	}
	
}