Java:拆分后获取最后一个元素

Java平台的脚本 «使用Rhino/Nashorn在JVM上运行Javascript

Rhino «Rhino是一个完全用Java编写的JavaScript的开源实现.它通常嵌入到Java应用程序中,以便为最终用户提供脚本.它作为默认的Java脚本引擎嵌入在J2SE 6中.

Nashorn是Oracle使用Java编程语言开发的JavaScript引擎.它基于Da Vinci Machine并已与Java 8一起发布.

Java脚本编程程序员指南

public class SplitOperations {
    public static void main(String[] args) {
        String str = "my.file.png.jpeg", separator = ".";
        javascript_Split(str, separator);
    }
    public static void javascript_Split( String str, String separator ) {
        ScriptEngineManager manager = new ScriptEngineManager();
        ScriptEngine engine = manager.getEngineByName("JavaScript");

        // Script Variables « expose java objects as variable to script.
        engine.put("strJS", str);

        // JavaScript code from file
        File file = new File("E:/StringSplit.js");
        // expose File object as variable to script
        engine.put("file", file);

        try {
            engine.eval("print('Script Variables « expose java objects as variable to script.', strJS)");

            // javax.script.Invocable is an optional interface.
            Invocable inv = (Invocable) engine;

            // JavaScript code in a String
            String functions = "function functionName( functionParam ) { print('Hello, ' + functionParam); }";
            engine.eval(functions);
            // invoke the global function named "functionName"
            inv.invokeFunction("functionName", "function Param value!!" );

            // evaluate a script string. The script accesses "file" variable and calls method on it
            engine.eval("print(file.getAbsolutePath())");
            // evaluate JavaScript code from given file - specified by first argument
            engine.eval( new java.io.FileReader( file ) );

            String[] typedArray = (String[]) inv.invokeFunction("splitasJavaArray", str );
            System.out.println("File : Function returns an array : "+ typedArray[1] );

            ScriptObjectMirror scriptObject = (ScriptObjectMirror) inv.invokeFunction("splitasJavaScriptArray", str, separator );
            System.out.println("File : Function return script obj : "+ convert( scriptObject ) );

            Object eval = engine.eval("(function() {return ['a', 'b'];})()");
            Object result = convert(eval);
            System.out.println("Result: {}"+ result);

            // JavaScript code in a String. This code defines a script object 'obj' with one method called 'hello'.
            String objectFunction = "var obj = new Object(); obj.hello = function(name) { print('Hello, ' + name); }";
            engine.eval(objectFunction);
            // get script object on which we want to call the method
            Object object = engine.get("obj");
            inv.invokeMethod(object, "hello", "Yash !!" );

            Object fileObjectFunction = engine.get("objfile");
            inv.invokeMethod(fileObjectFunction, "hello", "Yashwanth !!" );
        } catch (ScriptException e) {
            e.printStackTrace();
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }

    public static Object convert(final Object obj) {
        System.out.println("\tJAVASCRIPT OBJECT: {}"+ obj.getClass());
        if (obj instanceof Bindings) {
            try {
                final Class cls = Class.forName("jdk.nashorn.api.scripting.ScriptObjectMirror");
                System.out.println("\tNashorn detected");
                if (cls.isAssignableFrom(obj.getClass())) {
                    final Method isArray = cls.getMethod("isArray");
                    final Object result = isArray.invoke(obj);
                    if (result != null && result.equals(true)) {
                        final Method values = cls.getMethod("values");
                        final Object vals = values.invoke(obj);
                        System.err.println( vals );
                        if (vals instanceof Collection) {
                            final Collection coll = (Collection) vals;
                            Object[] array = coll.toArray(new Object[0]);
                            return array;
                        }
                    }
                }
            } catch (ClassNotFoundException | NoSuchMethodException | SecurityException
                    | IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
            }
        }
        if (obj instanceof List) {
            final List list = (List) obj;
            Object[] array = list.toArray(new Object[0]);
            return array;
        }
        return obj;
    }
}

// var str = 'angular.1.5.6.js', separator = ".";
function splitasJavaArray( str ) {
  var result = str.replace(/\.([^.]+)$/, ':$1').split(':');
  print('Regex Split : ', result);
  var JavaArray = Java.to(result, "java.lang.String[]");
  return JavaArray;
  // return result;
}
function splitasJavaScriptArray( str, separator) {
    var arr = str.split( separator ); // Split the string using dot as separator
    var lastVal = arr.pop(); // remove from the end
    var firstVal = arr.shift(); // remove from the front
    var middleVal = arr.join( separator ); // Re-join the remaining substrings

    var mainArr = new Array();
    mainArr.push( firstVal ); // add to the end
    mainArr.push( middleVal );
    mainArr.push( lastVal );

    return mainArr;
}

var objfile = new Object();
objfile.hello = function(name) { print('File : Hello, ' + name); }

final Splitter splitter = Splitter.on("-").trimResults();
assertEquals("Günnewig Uebachs", Iterables.getLast(splitter.split(one)));
assertEquals("Madison", Iterables.getLast(splitter.split(two)));

lastone = one.split("-")[(one.split("-")).length -1]