java-design-patterns/interpreter/src/main/java/com/iluwatar/PlusExpression.java

package com.iluwatar;

public class PlusExpression extends Expression {

	private Expression leftExpression;
	private Expression rightExpression;

	public PlusExpression(Expression leftExpression, Expression rightExpression) {
		this.leftExpression = leftExpression;
		this.rightExpression = rightExpression;
	}

	@Override
	public int interpret() {
		return leftExpression.interpret() + rightExpression.interpret();
	}

	@Override
	public String toString() {
		return "+";
	}

}