JarCastingmathjava
mathjs.org json parse via java
Install
<dependency>
<groupId>com.zx5435</groupId>
<artifactId>mathjava</artifactId>
<version>1.0</version>
</dependency>
implementation 'com.zx5435:mathjava:1.0'
How to use it
String a = "{'value': 3, 'mathjs': 'ConstantNode'}";
Double x = Mathjs.compileString(a).evaluate();
// output 3.0
String a = "{\"fn\": \"multiply\", \"op\": \"*\", \"args\": [{\"value\": 2, \"mathjs\": \"ConstantNode\"}, {\"name\": \"x\", \"mathjs\": \"SymbolNode\"}], \"mathjs\": \"OperatorNode\", \"implicit\": false}";
Double x = Mathjs.compileString(a).evaluate(new HashMap<String, Double>() {{
put("x", 123.0);
}});
// output 2 * x = 246.0
Mathjs supported nodes
- ConstantNode
- FunctionNode
sin cos - OperatorNode
+ - * / - ParenthesisNode
() - SymbolNode
x