PrintToString.java

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import javax.script.*;
import java.io.StringWriter;

// simple example demonstrating capturing of "print" output
// from script execution as a String via script engine API.

public class PrintToString {
  public static void main(String[] args) throws ScriptException {
    ScriptEngineManager m = new ScriptEngineManager();
    ScriptEngine e = m.getEngineByName("nashorn");
    StringWriter sw = new StringWriter();
    e.getContext().setWriter(sw);
    e.eval("print('hello world')");
    System.out.println(sw.toString());
  }
}