recolectan todas las formas posibles junto !!
Mediante el uso de lastIndexOf() & substring() métodos de Java.lang.String
// int firstIndex = str.indexOf(separator);
int lastIndexOf = str.lastIndexOf(separator);
String begningPortion = str.substring(0, lastIndexOf);
String endPortion = str.substring(lastIndexOf + 1);
System.out.println("First Portion : " + begningPortion);
System.out.println("Last Portion : " + endPortion);
split()Java SE 1.4. Divide el texto proporcionado en una matriz.
String[] split = str.split(Pattern.quote(separator));
String lastOne = split[split.length-1];
System.out.println("Split Array : "+ lastOne);
Java 8 secuencial clasificadas stream de una matriz.
String firstItem = Stream.of(split)
.reduce((first,last) -> first).get();
String lastItem = Stream.of(split)
.reduce((first,last) -> last).get();
System.out.println("First Item : "+ firstItem);
System.out.println("Last Item : "+ lastItem);
Apache Commons Lang jar «org.apache.commons.lang3.StringUtils
String afterLast = StringUtils.substringAfterLast(str, separator);
System.out.println("StringUtils AfterLast : "+ afterLast);
String beforeLast = StringUtils.substringBeforeLast(str, separator);
System.out.println("StringUtils BeforeLast : "+ beforeLast);
String open = "[", close = "]";
String[] groups = StringUtils.substringsBetween("Yash[777]Sam[7]", open, close);
System.out.println("String that is nested in between two Strings "+ groups[0]);
Guava: Google Core Libraries for Java. «Com.google.common.base.Divisor
Splitter splitter = Splitter.on(separator).trimResults();
Iterable<String> iterable = splitter.split(str);
String first_Iterable = Iterables.getFirst(iterable, "");
String last_Iterable = Iterables.getLast(iterable);
System.out.println(" Guava FirstElement : "+ first_Iterable);
System.out.println(" Guava LastElement : "+ last_Iterable);
Scripting for the Java Platform «ejecutar JavaScript en la JVM con Rhino/Nashorn
Rhino« Rhino es una implementación de código abierto de JavaScript escrito completamente en Java. Normalmente está integrado en las aplicaciones Java para proporcionar scripts a los usuarios finales. Está integrado en J2SE 6 como el motor de scripts Java predeterminado.
Nashorn es un motor de JavaScript desarrollado en el lenguaje de programación Java por Oracle. Se basa en la máquina Vinci Da y ha sido puesto en libertad con Java 8.
Java Scripting Programmer's Guide
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;
}
}
archivo JavaScript «StringSplit.js
// 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); }
En lugar de esto, puede usar subcadena e indexof. –
@SurendarKannan La respuesta más votado tiene un ejemplo de eso, con lastIndexOf. –