Java Exercises: Get the first occurrence of an element of a given array
Java Basic: Exercise-119 with Solution
Write a Java program to get the first occurrence (Position starts from 0.) of an element of a given array.
Pictorial Presentation:
Sample Solution:
Java Code:
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
int nums[] = {2, 4, 6, 7, 8};
int target = 7;
int lower = 0;
int upper = nums.length - 1;
int index = -1;
while (lower <= upper) {
int mid = (lower + upper) >> 1;
if (nums[mid] == target) {
index = mid;
}
if (nums[mid] >= target) {
upper = mid - 1;
} else {
lower = mid + 1;
}
}
System.out.print("Position of "+target +" is "+index);
}
}
Sample Output:
Position of 7 is 3
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!
Ref: https://bit.ly/32urdSe
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