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package designPattern.interpreter;

/**

* 减法表达式类

*/

public class Minus extends AbstractExpression{

// 减号左边的表达式

private AbstractExpression left;

// 减号右边的表达式

private AbstractExpression right;

public Minus(AbstractExpression left, AbstractExpression right) {

this.left = left;

this.right = right;

}

@Override

public int interpret(Context context) {

// 将左边表达式的结果和右边表达式的结果相减

return left.interpret(context) - right.interpret(context);

}

@Override

public String toString() {

return "(" + left.toString() + "-" + right.toString() + ")";

}

}