Java Eclipse中实现快速替换变量

// 字符串的运算公式直接转计算结果
 public static void main(String[] args) {<br>ScriptEngine <a class="baidu-highlight" href="https://www.baidu.com/s?wd=se&tn=SE_PcZhidaonwhc_ngpagmjz&rsv_dl=gh_pc_zhidao" rel="external nofollow" rel="external nofollow" target="_blank">se</a> = new ScriptEngineManager().getEngineByName("JavaScript");<br>String str = "2*3-45/5+9+9%5";<br>try {<br>Double d = (Double) <a class="baidu-highlight" href="https://www.baidu.com/s?wd=se&tn=SE_PcZhidaonwhc_ngpagmjz&rsv_dl=gh_pc_zhidao" rel="external nofollow" rel="external nofollow" target="_blank">se</a>.eval(str);<br>System.out.println(d);<br>} catch (ScriptException e) {<br>e.printStackTrace();<br>}<br>}