Answers for "java how to find duplicates in a list"

2

java 8 get duplicates in list

List<Integer> numbers = Arrays.asList(1, 2, 1, 3, 4, 4);
Set<Integer> nbrRemovedSet = new HashSet<>();

// Set.add() returns false if the element was already in the set.
Set<Integer> nbrSet = numbers
	.stream()
  	.filter(n -> !nbrRemovedSet.add(n))
  	.collect(Collectors.toSet());

// also, we can use Collections.frequency:
Set<Integer> nbrSet = numbers
	.stream()
  	.filter(i -> Collections.frequency(numbers, i) >1)
    collect(Collectors.toSet());
Posted by: Guest on February-18-2021
-1

Java find duplicate items

System.out.print("Duplicate Characters in above string are: ");
for (int i = 0; i < str.length(); i++) {
   for (int j = i + 1; j < str.length(); j++) {
      if (carray[i] == carray[j]) {
         System.out.print(carray[j] + " ");
         break;
      }
   }
}
Posted by: Guest on June-05-2021
2

java 8 get duplicates in list

List<Integer> numbers = Arrays.asList(1, 2, 1, 3, 4, 4);
Set<Integer> nbrRemovedSet = new HashSet<>();

// Set.add() returns false if the element was already in the set.
Set<Integer> nbrSet = numbers
	.stream()
  	.filter(n -> !nbrRemovedSet.add(n))
  	.collect(Collectors.toSet());

// also, we can use Collections.frequency:
Set<Integer> nbrSet = numbers
	.stream()
  	.filter(i -> Collections.frequency(numbers, i) >1)
    collect(Collectors.toSet());
Posted by: Guest on February-18-2021
-1

Java find duplicate items

System.out.print("Duplicate Characters in above string are: ");
for (int i = 0; i < str.length(); i++) {
   for (int j = i + 1; j < str.length(); j++) {
      if (carray[i] == carray[j]) {
         System.out.print(carray[j] + " ");
         break;
      }
   }
}
Posted by: Guest on June-05-2021

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