reverse array in java
int length = array.length;
for(int i=0;i<length/2;i++) {
int swap = array[i];
array[i] = array[length-i-1];
array[length-i-1] = swap;
}
or
Collections.reverse(Arrays.asList(array));reverse array in java
int length = array.length;
for(int i=0;i<length/2;i++) {
int swap = array[i];
array[i] = array[length-i-1];
array[length-i-1] = swap;
}
or
Collections.reverse(Arrays.asList(array));reverse an array in java using while loop
import java.util.Scanner;
public class Example
{
public static void main(String args[])
{
int counter, i=0, j=0, temp;
int number[] = new int[100];
Scanner scanner = new Scanner(System.in);
System.out.print("How many elements you want to enter: ");
counter = scanner.nextInt();
/* This loop stores all the elements that we enter in an
* the array number. First element is at number[0], second at
* number[1] and so on
*/
for(i=0; i<counter; i++)
{
System.out.print("Enter Array Element"+(i+1)+": ");
number[i] = scanner.nextInt();
}
/* Here we are writing the logic to swap first element with
* last element, second last element with second element and
* so on. On the first iteration of while loop i is the index
* of first element and j is the index of last. On the second
* iteration i is the index of second and j is the index of
* second last.
*/
j = i - 1;
i = 0;
scanner.close();
while(i<j)
{
temp = number[i];
number[i] = number[j];
number[j] = temp;
i++;
j--;
}
System.out.print("Reversed array: ");
for(i=0; i<counter; i++)
{
System.out.print(number[i]+ " ");
}
}
}Copyright © 2021 Codeinu
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