Java Exercises: Find a number that appears only once in a given array of integers, all numbers occur twice
Java Basic: Exercise-129 with Solution
Write a Java program to find a number that appears only once in a given array of integers, all numbers occur twice.
Example: {10,2,38,23,38,23,21}
Output: 23
Pictorial Presentation:
Sample Solution:
Java Code:
import java.util.*;
public class Main {
public static void main(String[] arg)
{
int nums[] = {10, 20, 10, 20, 30, 40, 40, 30, 50};
int result;
System.out.println("Source Array : "+Arrays.toString(nums));
result = getSingleNumber(nums);
System.out.println("\n"+result+" appears only once.");
}
public static int getSingleNumber(int[] nums) {
if(nums == null || nums.length == 0) {
return -1;
}
int result = 0;
for (int i = 0; i < nums.length; i++) {
result ^= nums[i];
}
return result;
}
}
Sample Output:
Source Array : [10, 20, 10, 20, 30, 40, 40, 30, 50] 50 appears only once
Flowchart:
Java Code Editor:
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Java: Tips of the Day
How to sort an ArrayList?
Collections.sort(testList); Collections.reverse(testList);
That will do what you want. Remember to import Collections though!
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