alexino2 :
I have a method that count the position of an Item by comparing others Item names, but I wanted to know if there were a simplier way to do it ?
// arr.get(0) : Item0:"nameA"
// arr.get(1) : Item1:"nameB"
// arr.get(2) : Item2:"nameB"
// arr.get(3) : Item3:"nameB"
// arr.get(4) : Item4:"nameC"
// arr.get(5) : Item5:"nameC"
// arr.get(6) : Item6:"nameB"
// If I set (arr, Item2) : should return 2 ("nameB")
// If I set (arr, Item6) : should return 4 ("nameB")
// If I set (arr, Item5) : should return 2 ("nameC")
public int positionOfItemByName(Item[] array, Item item) {
int cpt = 0;
for (int i = 0; i < arr.length; i++) {
if (array[i].name().indexOf( item.name() ) == -1) continue;
cpt++;
if (array[i] == item) break;
}
return cpt;
}
Thanks !
Arvind Kumar Avinash :
Looking at your requirement, the method name, positionOfItemByName
doesn't sound appropriate. From an execution perspective, it doesn't matter which name you choose. However, the name should be as self-descriptive as possible.
Given below is the logic to meet your requirement:
public static int countOfItemByNameAndPosition(Item[] array, Item item) {
List<Item> arr = new ArrayList<Item>(Arrays.asList(array));
int cpt = 0;
int index = arr.indexOf(item);
if (index != -1) {
for (int i = 0; i < arr.size() && i <= index; i++) {
if (arr.get(i).name.equals(item.name)) {
cpt++;
}
}
}
return cpt;
}
Demo
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
class Item {
String name;
public Item(String name) {
this.name = name;
}
@Override
public String toString() {
return "Item [name=" + name + "]";
}
}
public class Main {
public static void main(String[] args) {
Item item0 = new Item("nameA");
Item item1 = new Item("nameB");
Item item2 = new Item("nameB");
Item item3 = new Item("nameB");
Item item4 = new Item("nameC");
Item item5 = new Item("nameC");
Item item6 = new Item("nameB");
Item[] array = { item0, item1, item2, item3, item4, item5, item6 };
System.out.println(countOfItemByNameAndPosition(array, item2));
System.out.println(countOfItemByNameAndPosition(array, item6));
System.out.println(countOfItemByNameAndPosition(array, item5));
}
public static int countOfItemByNameAndPosition(Item[] array, Item item) {
List<Item> arr = new ArrayList<Item>(Arrays.asList(array));
int cpt = 0;
int index = arr.indexOf(item);
if (index != -1) {
for (int i = 0; i < arr.size() && i <= index; i++) {
if (arr.get(i).name.equals(item.name)) {
cpt++;
}
}
}
return cpt;
}
}
Output:
2
4
2
Using Stream API:
public static int countOfItemByNameAndPosition(Item[] array, Item item) {
List<Item> arr = new ArrayList<Item>(Arrays.asList(array));
return (int) IntStream.range(0, arr.indexOf(item)+1).filter(i -> item.name.equals(arr.get(i).name)).count();
}
Demo
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.stream.IntStream;
class Item {
String name;
public Item(String name) {
this.name = name;
}
@Override
public String toString() {
return "Item [name=" + name + "]";
}
}
public class Main {
public static void main(String[] args) {
Item item0 = new Item("nameA");
Item item1 = new Item("nameB");
Item item2 = new Item("nameB");
Item item3 = new Item("nameB");
Item item4 = new Item("nameC");
Item item5 = new Item("nameC");
Item item6 = new Item("nameB");
Item[] array = { item0, item1, item2, item3, item4, item5, item6 };
System.out.println(countOfItemByNameAndPosition(array, item2));
System.out.println(countOfItemByNameAndPosition(array, item6));
System.out.println(countOfItemByNameAndPosition(array, item5));
}
public static int countOfItemByNameAndPosition(Item[] array, Item item) {
List<Item> arr = new ArrayList<Item>(Arrays.asList(array));
return (int) IntStream.range(0, arr.indexOf(item) + 1).filter(i -> item.name.equals(arr.get(i).name)).count();
}
}
Output:
2
4
2
Feel free to comment in case of any doubt/issue.
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