public static Double calcStr(String expr){ try { ScriptEngineManager manager = new ScriptEngineManager(); ScriptEngine engine = manager.getEngineByName("js"); Object result = engine.eval(expr); if("NaN".equals(result.toString())) return 0.00; return Double.parseDouble(result+""); }catch (Exception e){ return 0.00; } }
java计算字符串
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