blocks|key|2198202|text|Java已经内置(javax.script.*)+JavaScript引擎：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2198203|Java平台的脚本编写|unordered-list-item|2198204|Java脚本程序员指南|2198205|它能让你解出这样的方程。|2198206|entityMap|0|LINK|mutability|MUTABLE|url|http://docs.oracle.com/javase/7/docs/api/javax/script/package-frame.html|1|https://today.java.net/pub/a/today/2006/04/11/scripting-for-java-platform.html|2|http://docs.oracle.com/javase/6/docs/technotes/guides/scripting/programmer_guide/^0|9|E|9|E|0|0|0|B|1|0|0|B|2|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@$9|11|A|12|1|13]]|E|$]]|$1|F|3|G|5|H|7|14|8|@]|D|@$9|15|A|16|1|17]]|E|$]]|$1|I|3|J|5|H|7|18|8|@]|D|@$9|19|A|1A|1|1B]]|E|$]]|$1|K|3|L|5|6|7|1C|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|1D|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]|U|$5|P|Q|R|E|$S|V]]|W|$5|P|Q|R|E|$S|X]]]]

Java has built-in (<a href="http://docs.oracle.com/javase/7/docs/api/javax/script/package-frame.html" rel="nofollow"><code>javax.script.*</code></a>) JavaScript engine: 

<ul>
<li><a href="https://today.java.net/pub/a/today/2006/04/11/scripting-for-java-platform.html" rel="nofollow">Scripting for the Java Platform</a></li>
<li><a href="http://docs.oracle.com/javase/6/docs/technotes/guides/scripting/programmer_guide/" rel="nofollow">Java Scripting Programmer's Guide</a></li>
</ul>

It allow you to solve equations like these.

blocks|key|137536|text|..An的例子是"(10+%2B5/+3)+2-3+(10+*+(8+%5E+4))“。。。|type|blockquote|depth|inlineStyleRanges|entityRanges|data|137537|尝试访问这个演示。..。|unstyled|offset|length|137538|​|137539|📷|atomic|137540|137541|我环顾了一下堆栈溢出，发现了两样东西，第三方API和ScriptEngine。
这两方面我都有问题，因为我不希望使用任何第三方API，而且脚本引擎的eval()函数(至少对我阅读和理解的内容而言)在功能上是有限的。|style|CODE|137542|这种理解是不正确的。|137543|另请参阅|137544|使用ScriptEngine的示例。|137545|EvaluateString.java。|ordered-list-item|137546|137547|137548|SwingCalculator.java+(因为它太漂亮了)|137549|137550|137551|=|137552|137553|137554|entityMap|0|LINK|mutability|MUTABLE|url|http://pscode.org/jse.html?eval=eval%2528%2527%252810%2B%252B%2B5%2B%252F%2B3%2529%2B%252A%2B2%2B-%2B3%2B%252A%2B%252810%2B%252A%2B%25288%2B%255E%2B4%2529%2529%2527%2529%253B|1|IMAGE|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/fbfc93e135762966b921d3b141322d2f.png|imageAlt|2|https://stackoverflow.com/a/17182757/418556|3|https://developer.qcloudimg.com/http-save/yehe-900000/454a3732c956b77a6554c4766818c632.png|4|https://stackoverflow.com/a/7441804/418556|5|https://developer.qcloudimg.com/http-save/yehe-900000/3f7417acc3d3a16fda96c6a34d0915de.png|6|https://developer.qcloudimg.com/http-save/yehe-900000/34289f72fc336684ceda8abbe289d0d3.png^0|0|6|3|0|0|0|0|1|1|0|0|Q|C|0|0|0|2|C|0|0|J|0|J|2|0|0|0|1|3|0|0|K|0|K|4|0|0|0|1|5|0|0|0|1|6|0|0^^$0|@$1|2|3|4|5|6|7|1X|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|1Y|8|@]|9|@$E|1Z|F|20|1|21]]|A|$]]|$1|G|3|H|5|D|7|22|8|@]|9|@]|A|$]]|$1|I|3|J|5|K|7|23|8|@]|9|@$E|24|F|25|1|26]]|A|$]]|$1|L|3|H|5|D|7|27|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|28|8|@$E|29|F|2A|O|P]]|9|@]|A|$]]|$1|Q|3|R|5|D|7|2B|8|@]|9|@]|A|$]]|$1|S|3|T|5|D|7|2C|8|@]|9|@]|A|$]]|$1|U|3|V|5|D|7|2D|8|@$E|2E|F|2F|O|P]]|9|@]|A|$]]|$1|W|3|X|5|Y|7|2G|8|@$E|2H|F|2I|O|P]]|9|@$E|2J|F|2K|1|2L]]|A|$]]|$1|Z|3|H|5|D|7|2M|8|@]|9|@]|A|$]]|$1|10|3|J|5|K|7|2N|8|@]|9|@$E|2O|F|2P|1|2Q]]|A|$]]|$1|11|3|12|5|Y|7|2R|8|@$E|2S|F|2T|O|P]]|9|@$E|2U|F|2V|1|2W]]|A|$]]|$1|13|3|H|5|D|7|2X|8|@]|9|@]|A|$]]|$1|14|3|J|5|K|7|2Y|8|@]|9|@$E|2Z|F|30|1|31]]|A|$]]|$1|15|3|16|5|D|7|32|8|@]|9|@]|A|$]]|$1|17|3|J|5|K|7|33|8|@]|9|@$E|34|F|35|1|36]]|A|$]]|$1|18|3|H|5|D|7|37|8|@]|9|@]|A|$]]|$1|19|3|-4|5|D|7|38|8|@]|9|@]|A|$]]]|1A|$1B|$5|1C|1D|1E|A|$1F|1G]]|1H|$5|1I|1D|1J|A|$1K|1L|1M|-4]]|1N|$5|1C|1D|1E|A|$1F|1O]]|1P|$5|1I|1D|1J|A|$1K|1Q|1M|-4]]|1R|$5|1C|1D|1E|A|$1F|1S]]|1T|$5|1I|1D|1J|A|$1K|1U|1M|-4]]|1V|$5|1I|1D|1J|A|$1K|1W|1M|-4]]]]

<blockquote>
 ..An example would be "(10 + 5 / 3) 2 - 3 (10 * (8 ^ 4))". ..
</blockquote>

Try visiting this <a href="http://pscode.org/jse.html?eval=eval%28%27%2810+%2B+5+%2F+3%29+%2A+2+-+3+%2A+%2810+%2A+%288+%5E+4%29%29%27%29%3B" rel="nofollow noreferrer"><code>ScriptEngine</code> demo.</a>..

<img src="https://i.stack.imgur.com/zNRRQ.png" alt="enter image description here">

<blockquote>
 I've looked around stackoverflow and found two things, third party API's and the <code>ScriptEngine</code>.
 
 I have problems with both of these, as I don't desire to use any third party API's and the script engine's eval() function, at least to my what I've read and understand, is limited in it's capabilities
</blockquote>

That understanding is incorrect.

<hr>

<h2>See also</h2>

Examples using <code>ScriptEngine</code>.

<ol>
<li><a href="https://stackoverflow.com/a/17182757/418556"><code>EvaluateString.java</code></a>.</li>
</ol>

<img src="https://i.stack.imgur.com/udAvl.png"> 

<ol start="2">
<li><a href="https://stackoverflow.com/a/7441804/418556"><code>SwingCalculator.java</code></a> (because it is so pretty)</li>
</ol>

<img src="https://i.stack.imgur.com/DVoux.png" alt="Calculet input"> = <img src="https://i.stack.imgur.com/KcbFU.png" alt="Calculet output">

I'm working on a <a href="https://github.com/michaelwm/homework-helper" rel="nofollow">java program</a>, and one of the tasks I desire it to complete is converting a user given input into an equation that the program will solve. An example would be "(10 + 5 / 3) 2 - 3 (10 * (8 ^ 4))". It has to be able to solve secondary education level equations, so exponents, exponential notation, and possibly even variable solving are required.

I've looked around stackoverflow and found two things, third party API's and the ScriptEngine.

I have problems with both of these, as I don't desire to use any third party API's and the script engine's eval() function, at least to my what I've read and understand, is limited in it's capabilities.

Is there any other native API for doing something like this? Some trick I'm missing?

So, to recap, I want something native to java, that is not the script engine, that can solve secondary education level equations and expressions.

Converting String objects into Equations

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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