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I need help with a implementation of a function that gives me all combinations of ArrayList<ArrayList<String>> (not List<List<String>>) List in fix order.
An Example for what I need:
From:
List1:[1,2]
List2:[3,4]
List3:[5,6]
To:
String 1 "1,3,5"
String 2 "1,3,6"
String 3 "1,4,5"
String 4 "1,4,6"
String 5 "2,3,5"
String 6 "2,3,6"
String 7 "2,4,5"
String 8 "2,4,6"
All Strings in ArrayList<String> Object
Please help me, I have no idea how to implement it.
PS: The size of ArrayList<ArrayList<String>> is variable.
PSS: ...and the size from the ArrayList lists are variable.
After little changes from the old rev it works now (ArrayIndexOutOfBoundsException and deleting to much on result):
void generate(ArrayList<ArrayList<String>> lists,
ArrayList<String> result, int index) {
if (index >= lists.size()) {
System.out.println(String.valueOf(result));
return;
}
ArrayList<String> list = lists.get(index);
for (int i = 0; i < list.size(); i++) {
result.add(list.get(i));
generate(lists, result, index + 1);
result.remove(result.size() - 1);
}
}
}
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creditTIDstatusArray=[93312263-1-09722612223, 99802001-1-09102842369, 99802002-1-09102842369];
creditTIDstatusList.addAll(Arrays.asList(creditTIDstatusArry));
searchValue="99802002-1".
int retval=creditTIDstatusList.indexOf("99802002-1");
System.out.println("The element at index is:" retval);
Output: 2
Please let me know how I can find the index of the given above(searchValue)element.
As you never have posted the reproducible code.
Assumptions
creditTIDstatusArray is a String type array.
Your search query always stays in front of each String value in the array.
Multiple indexes may start with the same search value.
String[] creditTIDstatusArray=new String[]{"93312263-1-09722612223", "99802001-1-09102842369", "99802002-1-09102842369"};
String searchValue="99802002-1";
for (int i = 0; i < creditTIDstatusArray.length; i++) {
if(creditTIDstatusArray[i].startsWith(searchValue)){
System.out.println("Index :" + I); // this will print all the indexes that starts with searchvalue
}
}
I am not sure why you have added the array into a list and then searched index of because it will never work as you are searching only part of a String rather than the whole value or object.
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How to change this for loop into stream?
public int calculateForSpliterator(String[] matchTab, String spliterator, RulesChecker rulesChecker) {
int finalScore = 0;
for (String element : matchTab) {
String[] splitScroes = element.split(spliterator);
int ourPoints = Integer.parseInt(splitScroes[0]);
int theirPoints = Integer.parseInt(splitScroes[1]);
finalScore += rulesChecker.checkRules(ourPoints, theirPoints);
}
return finalScore;
}
Assuming RulesChecker#checkRules returns an int, then you can use:
public int calculateForSpliterator(String[] matchTab, String spliterator, RulesChecker rulesChecker) {
return Arrays.stream(matchTab)
.map(element -> element.split(spliterator))
.mapToInt(splitScores -> rulesChecker.checkRules(Integer.parseInt(splitScores[0]),
Integer.parseInt(splitScores[1])))
.sum();
}
Notice how this isn't much more readable than your current solution, so I probably would keep the for-loop if I were you.
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I've got a 6 char long string, and I would like to check, if there is just one from each character. How to?
You could compare the number of distinct characters to the length of the string:
boolean charMoreThanOnce = s.chars().distinct().count() < s.length();
You can do it using a Set. You need unique elements and Set gurantees you containing the unique elements. HashSet is implementation of Set, you can use it to implement this idea.
public boolean ifAllCharsUnique(String input){
char[] arr = input.toCharArray();
int length = arr.length;
Set<Character> checker = new HashSet<>();
for(int i =0 ; i < length; i++){
if(checker.contains(arr[i]){
return false;
}
checker.add(arr[i]);
}
return true;
}
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I am trying to convert each String in an ArrayList to int so then I can add them,
asuma is an ArrayList containing String
I need to iterate over this ArrayList to convert String to int
for (int i = 0; i <=asuma.size(); i++) {
and then I need to add the integers. How do I do it?
I suspect that the ArrayList you are referring to is asuma and that it is an ArrayList<String>. In that case, you can do this:
for (String s : asuma) {
int valorFinal = Integer.parseInt(s);
}
I think u try that:
for (int i = 0; i <=asuma.size(); i++) {
int valorFinal = Integer.parseInt(asuma.get(i));
}
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I have 5 distinct strings called, say, string1 through string5.
I want to write a simple if statement that runs if any two of the five strings contain the same string. How would I do that?
Thanks in advance!
Comparison is a binary operation, therefore you can always compare only two objects at a time. I would suggest using a cycle and comparing each string to the remaining ones.
public boolean multipleStringEquals(String[] strings) {
for (int i = 0; i < strings.length; i++) {
for (int j = i + 1; j < strings.length; j++) {
if (strings[i].equals(strings[j])) {
return true;
}
}
}
return false;
}