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AIMA-Java Core Algorithms from the book Artificial Intelligence a Modern Approach 3rd Ed.

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package aima.core.search.csp;

/**
 * A variable is a distinguishable object with a name.
 * 
 * @author Ruediger Lunde
 */
public class Variable {
	private String name;

	public Variable(String name) {
		this.name = name;
	}

	public String getName() {
		return name;
	}

	public String toString() {
		return name;
	}

	@Override
	public boolean equals(Object obj) {
		if (obj == null)
			return false;
		if (obj.getClass() == getClass())
			return this.name.equals(((Variable) obj).name);
		return false;
	}

	@Override
	public int hashCode() {
		return name.hashCode();
	}
}