[英]change java variables from JRuby code?
As title says i whant to change my variables in java from my jruby code 正如标题所说我想从我的jruby代码中改变java中的变量
To be more specific i have an integer in my Java code which has no value yet, And i whant with my JRuby code give this variable an value, But i have no idea how to do this. 更具体地说,我的Java代码中有一个整数没有值,而且我用我的JRuby代码给这个变量一个值,但我不知道怎么做。
This is how far i got with the JRuby code.. 这是我用JRuby代码得到的程度。
require 'java'
puts "Set player health here"
playerHealth = 3 # Setting player health here!
But have not yet wrote anything in java. 但还没有在java中写任何东西。 This is pretty much all I have so far..
到目前为止,这几乎就是我所有的......
From what I understand, you are trying to invoke the JRuby engine from Java, so you could do something like this to modify a Java variable in JRuby: 根据我的理解,您正在尝试从Java调用JRuby引擎,因此您可以执行类似这样的操作来修改JRuby中的Java变量:
import javax.script.*;
public class EvalJRubyScript {
public static void main(String[] args) throws Exception {
ScriptEngineManager factory = new ScriptEngineManager();
int playerHealth = 0;
ScriptEngine engine = factory.getEngineByName("jruby");
ScriptContext context = engine.getContext();
context.setAttribute("playerHealth", playerHealth, ScriptContext.ENGINE_SCOPE);
try {
engine.eval("$playerHealth = 42");
playerHealth = (Integer)context.getAttribute("playerHealth", ScriptContext.ENGINE_SCOPE);
System.out.println(playerHealth);
} catch (ScriptException exception) {
exception.printStackTrace();
}
}
}
Note that in the script playerHealth
is a global variable. 请注意,在脚本中
playerHealth
是一个全局变量。
Check out this link for more details if you want to load an external JRuby script rather than evaluating code. 如果要加载外部JRuby脚本而不是评估代码,请查看此链接以获取更多详细信息。
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