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import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
public class Test {
public static void main(String[] args) throws Exception {
ScriptEngineManager sem=new ScriptEngineManager();
ScriptEngine engine=sem.getEngineByExtension("js");
double result=(Double)engine.eval("1.23+2.34-3.45*4.5/6.6");
System.out.println(result);
}
}