Flash cards
Review the key moves
1/4
Core idea
What is the main idea behind Java How To Find Duplicates in an Array?
Lesson checks
Practice each idea before moving on
Short Mimo-style checks built from this lesson's code, terms, and sequence.
1Quick choice
Which statement best captures the main point of this lesson?
2Fill blank
Complete the missing token from the example code.
___[] nums = {1, 2, 3, 2, 4, 5, 1};3Order
Put the learning moves in the order that makes the concept easiest to apply.
Explanation: We go through the array one element at a time.
Print which elements appear more than once:
Find Duplicate Elements in an Array
Find Duplicate Elements in an Array
Print which elements appear more than once:
Example
int[] nums = {1, 2, 3, 2, 4, 5, 1};
for (int i = 0; i < nums.length; i++) {
for (int j = i + 1; j < nums.length; j++) {
if (nums[i] == nums[j]) {
System.out.println("Duplicate: " + nums[i]);
}
}
}Explanation: We go through the array one element at a time. - The outer loop picks a number (like the first 1 ). - The inner loop compares it with all the numbers that come after it. - If a match is found, we print it as a duplicate. In this example, the program finds 2 twice and 1 twice, so it prints them as duplicates.