If you want to hold on to the original position of the object you need to make a copy of the arraylist before you shuffle it. And then use indexOf solved Arraylist element index before and after Collections.shuffle in java
You can use both a Thread or an AsyncTask, just chose one of the two based on your needs (if you provide more details about the task you need to perform I might be able to help you more specifically). The Handler class is not meant to be used to run asynchronous tasks (like Thread … Read more
public static void main(String[] args) { List<String> data = new ArrayList<String>(); String yourRequiredString = “dessert”; data.add(“apple fruit”); data.add(“carrot vegetable”); data.add(“cake dessert”); for (int i = 0; i < data.size(); i++) { if (data.get(i).contains(yourRequiredString)) { System.out.println(i); } } } Hope this helps… solved Find String in ArrayList Containing Phrase
This is normally solved with just a String#replaceAll, but since you have a custom, dynamic replacement string, you can to use a Matcher to efficiently and concisely do the string replacement. public static String parse(String command, String… args) { StringBuffer sb = new StringBuffer(); Matcher m = Pattern.compile(“\\$(\\d+)”).matcher(command); while (m.find()) { int num = Integer.parseInt(m.group(1)); … Read more
This is quite easy to o actually. Requirement #1 and #3 are the easiest. To test for whether a string contains two words and are separated by exactly one space, just use the split method. For requirement #2, test if the strings have a length that is larger than 2. Let’s say your string to … Read more
You can get CustomerMapping by cardId using JPQL. A more optimal solution will be to use projections. public String getCustomerMappingCustomerId(String cardId) { getEntityManager(); CustomerMapping result = first(em.createQuery( “select c from CustomerMapping c where c.cardId = :cardId”) .setParameter(“cardId”, cardId).getResultList()); return result == null ? null : result.getCustomerId(); } private static <T> T first(List<T> items) { return … Read more
The Comparable interface is used to compare two objects and their order. As per the Javadocs, the compareTo method should return 0 if the two objects are equal, any negative number if this object is “smaller” than the specified other, and any positive number if this object is “larger” than the specified other. What “smaller” … Read more
The lines if(Character.isWhitespace(ch)) { spaces++; } else{ if(spaces>=1) { spaces=0; fos.write(‘ ‘); fos.write(ch);} in your code ensures you condense all whitespace characters into a single space. A newline is considered a whitespace character so you skip those as well. If you don’t want to group the newline with the other whitespace in this case a … Read more
If you are a begginer, its good that you didnt copied ready solution from the internet : ) You just need to think more about it. Solution is very simple, your program need to know number of the line ‘you’ are currently at how many X to print on that line Your loop should print … Read more
Bicyle bike1 = new Bicycle() is correct and would work as long as you have Bicycle.java class and you have JDK in classpath on your machine. Bicycle as you have mentioned is a java class and with that line, you are attempting to create an object (an instance with reference name: bike1) of the class. … Read more
This is called image slider . Follow below link for learning how to do it http://www.androidhive.info/2013/09/android-fullscreen-image-slider-with-swipe-and-pinch-zoom-gestures/ 1 solved what is this component how i can create it in android [closed]
luiscubal is right and if you want to compare the string instead of the first carachter, you can use Choice = zam.next(); wich returns a String and compare it using Choice.equals(“Borrow”). You get an error when you on Choice = zam.next() because zam.next() returns a String and you probably declared Choice as a char. 1 … Read more
Use .orElse(null) if you want null. The idea of Optional is to force you to explicitly handle the absence of the value. 0 solved Java 8 Optional get
Some Background It not exactly clear what your asking… but it sounds like you want to know why you can’t call the methods defined in MessageHandler from your list test of type List<MessageHandler>. The definition of List<E> in the javadoc explains that the parameter E is the type that the list can contain. The add(E … Read more
you program has many error which are corrected as follows: public class Af { public Af() { } int sum1 = 0; public int a() { int nr = 7; int c = 4; sum1 = nr + c; return sum1; } public int b() { int l = 7; int m = 4; int … Read more