package com.mathapp.models;

/**
 * 代表四则运算的枚举类型。
 */
public enum Operator {
  ADD("+"),
  SUBTRACT("-"),
  MULTIPLY("*"),
  DIVIDE("/");

  private final String symbol;

  Operator(String symbol) {
    this.symbol = symbol;
  }

  public String getSymbol() {
    return symbol;
  }
}