ひと通りの演算子 | Codetter（こーどったー）

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/**
 * 加法演算子です。
 */
public class Add implements Node {
    private Node left;
    private Node right;
    public Add(Node left, Node right) {
        this.left = left;
        this.right = right;
    }
    @Override
    public Node evaluation() {
        left = left.evaluation();
        right = right.evaluation();
        double result = ((Numeric)left).getValue() + ((Numeric)right).getValue();
        return new Numeric(result);
    }
}
/**
 * 減算演算子です。
 */
public class Sub implements Node {
    private Node left;
    private Node right;
    public Sub(Node left, Node right) {
        this.left = left;
        this.right = right;
    }
    @Override
    public Node evaluation() {
        left = left.evaluation();
        right = right.evaluation();
        double result = ((Numeric)left).getValue() - ((Numeric)right).getValue();
        return new Numeric(result);
    }
}
/**
 * 乗算演算子です。
 */
public class Multi implements Node {
    private Node left;
    private Node right;
    public Multi(Node left, Node right) {
        this.left = left;
        this.right = right;
    }
    @Override
    public Node evaluation() {
        left = left.evaluation();
        right = right.evaluation();
        double result = ((Numeric)left).getValue() * ((Numeric)right).getValue();
        return new Numeric(result);
    }
}
/**
 * 除算演算子です。
 */
public class Div implements Node {
    private Node left;
    private Node right;
    public Div(Node left, Node right) {
        this.left = left;
        this.right = right;
    }
    @Override
    public Node evaluation() {
        left = left.evaluation();
        right = right.evaluation();
        double result = ((Numeric)left).getValue() / ((Numeric)right).getValue();
        return new Numeric(result);
    }
}
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