I have an array of filenames and need to sort that array by the extensions of the filename. Is there an easy way to do this?
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Instead of trying to trying to put my problem into words, here's some code that demonstrates what I want to do:
Class [] domains = { Integer.class, Double.class, String.class };
String [] stringValues ...
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I have an array of a custom type that I want to sort by one of its String attributes. For some reason, the following code is producing wrong results. Could you ... |
I know that this question might have been asked before, but I was not able to find a fit answer. So say I have this array:
String [][] theArray = {{"james", "30.0"},{"joyce", ...
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What is the best(fastest) way to sort an array of Strings (using Java 1.3).
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I need to know how to sort an array of Strings, I know how to do a selection sort, however I have BOTH numbers and letters in the array. The idea ... |
I desire to compare Objects for insertion into a BST. if Objecta < Objectb type of comparison using Comparable.
I could use some guidance on this please. I want ... |
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Possible Duplicate:
Selection Sorting String Arrays (Java)
I have a list of cards
clubsArray = {TC, KC, 7C, AC}
These stand for (ten of clubs, king of ... |
I have a string array with values
List<String> list = new ArrayList<String>();
list = {'name1','10','name2','2','name3','15','name4','7'}
I want to sort this list and the output should be
list = {'name3','15','name1','10','name4','7','name2','2'}
How can I achieve ... |
I'm relatively new to the programming scene and i would like you to assist me with sorting of these arrays. The idea is to display a menu item on a textArea ... |
I have a Vector of Integer ( primary key of a database table ) ; and I implemented a method which returns a String based on this primary key Integer. My ... |
public class Sort {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
int num[] = { -1, 11, 3, ...
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Given a sorted list of strings and the last entry is null. You cannot use the list.length to determine the length of the list, but come with an approach efficient than ... |
I have a String array that contains the following entries:
Array[0] = "70% Marc"
Array[1] = "50% Marc"
Array[2] = "100% Marc"
... |
There is an example in my textbook for how to sort string arrays, but I am having a hard time understanding the logic of the code. We have the following ... |
Is this possible?
I have a function which accepts a user string and then splits into an array of words. I'm going to sort the array and de-duplicate it.
However, it will ... |
Instructions:
Write a program that will read a line of text that ends
with a period, which serves as a sentinel value. Display all the
letters that occur ... |
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Hi guys I am using a string array which has numbers in it. I want to sort the array by using insertion sort and storing the sorted numbers in a vector. When I used the following code, the program doesn't sort the numbers in the correct order. Where did I go wrong? Please help me. import java.util.*; public class FindMedian2{ public ... |
import java.util.ArrayList; import java.util.Iterator; public class Diary { // Instance variables private String name; private String address; private String email; private String phone; private String birthday; private ArrayList meetingList; /** * Constructor */ public Diary(String dName, String dAddress, String dEmail, String dPhone, String dBirthday) { // initialise instance variables name = dName; address = dAddress; email = dEmail; phone = dPhone; ... |
Greetings to all. This is my first time using this forum, and it is kind of an emergency, so I hope for quick responses. I believe this is a beginner problem. I am enrolled in an Introductory Java Programming class, and seem to be having issues grasping some of the concepts. Our teacher recently gave us an assignment of making a ... |
import java.util.*; class Testing { public Testing() { String[] str1 = {"B","b","A","a","C","c"}; String[] str2 = {"B","b","A","a","C","c"}; String[] str3 = {"B","b","A","a","C","c"}; Arrays.sort(str1); Collections.sort(Arrays.asList(str2),new CompCase()); Collections.sort(Arrays.asList(str3),new CompIgnoreCase()); System.out.println(Arrays.asList(str1)); System.out.println(Arrays.asList(str2)); System.out.println(Arrays.asList(str3)); } public static void main(String[] args){new Testing();} } class CompCase implements Comparator { public int compare(Object o1, Object o2) { return ((String)o1).compareTo((String)o2); } } class CompIgnoreCase implements Comparator { public int compare(Object o1, ... |
Hi, I found it. import java.util.Comparator; import java.util.Iterator; import java.util.TreeSet; public class TreeSetTest { public static void main(String[] args) { TreeSet ts = new TreeSet(new Comparator() { public int compare(Object o1, Object o2) { Emp e1 = (Emp) o1; Emp e2 = (Emp) o2; int int1 = e1.getName().compareTo(e2.getName()); int int2 = new Integer(e1.getAge()).compareTo(new Integer(e2.getAge())); if (int1 == 0) { return int2; ... |
Hi guys, I am new to Android AND to Java. I am trying to sort something like this: "lamp" = 12 "box" = 3 "chair" =5 .... I would like to sort by the value so that I get the following result: "box" "Chair" "Lamp" the number a floats. I was thinking of using ArrayList but I do not believe they ... |
Hello Java Forums, I missed the day in class that my AP CompSci teacher taught interfaces, but I was given the assignment nonetheless, and I'm trying my best to do it. I've gotten PRETTY close, but I'm still just a few lines of code off from victory, and I am simply out of original ideas and book/internet resources. I have enclosed ... |
here is my code, for a selection sort on 2 string arrays returning nothing. i have 2 string arrays loaded from a file now i need to sort them. but everytime i run this i get a null pointer exception public static void selectionSort(String[] array1, String[] array2) { int startScan, index, minIndex; String minValue1, minValue2; for (startScan = 0; startScan < ... |
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Some clues can be found in this bug report: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=5082260 The root of the matter seems to be a design decision, that mutable objects should not override equals, and consequently, Comparable should not be implemented (because if Comparable is implemented, it is strongly recommended that equals and hashCode be overridden). Why? Because any structures that rely on hashing or assumes the ... |
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I am a bit of a newbie to java programming and I am completely stuck on this. For an assignment I have been asked to sort a set of arrays into alphabetical order, firstly by the surname and then by the first name. The problem is i can not use the array.sort() method(s) from the base Java class-libraries. I know how ... |
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hmm bina so what you trying to say is that i need to create more methods in order to get my item name which in my conditon is str[0]. and then create a getItem(String name) method and then use the bubble sort?. wow just to do one thing i need to do alot of things strange. is there any other solution ... |
Anyway this post is like a million years old but sometimes people give up on projects because ******* programmers never help the little guy on these forums. what I would do, if you want to sort strings alphabetically is start with that first character in each string. You can use the >, >=, <, <= operators with char because they'll check ... |
That would be nice but I need to use insertion sort. Why does the '?' always come last if in the ASCII code it is number 63? Am I missing something. Also the sort doesn't seem to go to the next char in the string array. If two string are abcdef and acdef. I doesn't look at the 2nd char. |
= new String (names[1] + names[0]) 3) sort temp[] with built in Java sort 4) make a permanent new string array, hexValues[] for the hex values 5) copy the last 6 characters of each item to hexValues[] 6) truncate the last 6 characters of each item in temp[] 7) build list widget with temp[] Is there a more elegant way? What ... |
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First of all you should not be storing a number as a String, it will not sort properly. (ie "10" is sorted before "2"). A better design is to create a custom class that contains the two values. Then you can have the class implement the Comparable interface and just use the Collections.sort(...) method. A simple example can be found here: ... |
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Hello, I need help sorting a list of alpha numeric string. I am currently using a treemap but here is my problem. As an example I have the following strings which are the keys to the map: Car1 Car2 Car12 Now what happens when I use the treemap , a string comparison is performed and I get the following list Car1 ... |
The scenario is, at the start, these workers can select what would be their neighbourhood departments while they are working in one eact department. so the programme must sort and produce results to show, what are the possible departments according to their requests. i checked most of the forums that i could find vector sorting. but , right now , it's ... |
thx for the tip now only i realize a new proble in my program im my main method i have 5 different arrays which store 5 different information about the flight like destination, departure time and etc... if i sort the array which holds the destination by alphabetical order (which is fine) how will i arrange to display other details according ... |
I have no idea why this doesn't work but when I pass in the variable: String [] lastModifiedTimes = new String[numFiles]; To the java.util.Arrarys.sort(lastModifiedTimes); it returns the error below. C:\webMethods6\IntegrationServer\packages\PxAmexEmp\code\source\PxAmexEmp\javaService.java:179: incompatible types found : void required: java.lang.String[] lastModifiedTimesSorted = java.util.Arrays.sort(lastModifiedTimes); ^ 1 error I've been coding for a while not it's probably something dumb im missing. Thanks. |
I looked around for how you sort arrays of strings and all I found was the easy way. I know its much easier but I want to do it the long way and I imagine my instructor does too. I have sorted int arrays before bit know its not as simple as manipulating the int comparison code for strings like i ... |
protivakid wrote: So with the help of you guys I found out how to get numeric values out of comparing strings, now i need some help formulating a solid sort as you see mine does not sort to well at all. it's so easy to do with ints as I have done b4 but these strings are really getting to me. ... |
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