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Java/07-Java-Programs/068-Reverse-an-Array.java at main · shaikbasha-dev/Java · GitHub
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068-Reverse-an-Array.java
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/*
* ============================================================================
* Program Name : Reverse an Array
* File Name : 068-Reverse-an-Array.java
* Class Name : ReverseAnArray
*
* Description:
* This program accepts the size and elements of a one-dimensional array
* from the user and prints the array elements in reverse order.
*
* Objective:
* - Understand user input using the Scanner class.
* - Learn how to traverse an array in reverse order.
* - Display the array elements from last to first.
*
* Author : Shaik Mahaboob Basha
* Repository : 01-Core-Java
* Folder : 08-Java-Programs
* ============================================================================
*/
import
java
.
util
.
Scanner
;
public
class
ReverseAnArray
{
// The main() method is the entry point of every Java application.
public
static
void
main
(
String
[]
args
) {
// Create a Scanner object to read input from the keyboard.
Scanner
scanner
=
new
Scanner
(
System
.
in
);
// Ask the user to enter the size of the array.
System
.
out
.
print
(
"Enter the Size of the Array: "
);
// Read the size entered by the user.
int
size
=
scanner
.
nextInt
();
// Check whether the entered size is valid.
if
(
size
<=
0
) {
// Display an error message.
System
.
out
.
println
(
"Please enter a positive array size."
);
}
else
{
// Declare a one-dimensional integer array.
int
[]
array
=
new
int
[
size
];
// Ask the user to enter the array elements.
System
.
out
.
println
(
"Enter "
+
size
+
" Array Elements:"
);
// Read all array elements.
for
(
int
i
=
0
;
i
<
size
;
i
++) {
// Store the current element in the array.
array
[
i
] =
scanner
.
nextInt
();
}
// Display the original array.
System
.
out
.
println
(
"Original Array:"
);
// Traverse and print the original array.
for
(
int
i
=
0
;
i
<
size
;
i
++) {
// Print the current array element.
System
.
out
.
print
(
array
[
i
] +
" "
);
}
// Move the cursor to the next line.
System
.
out
.
println
();
// Display the reversed array.
System
.
out
.
println
(
"Reversed Array:"
);
// Traverse the array from last index to first index.
for
(
int
i
=
size
-
1
;
i
>=
0
;
i
--) {
// Print the current array element.
System
.
out
.
print
(
array
[
i
] +
" "
);
}
// Move the cursor to the next line.
System
.
out
.
println
();
// Example Output:
// Enter the Size of the Array: 5
// Enter 5 Array Elements:
// 10
// 20
// 30
// 40
// 50
// Original Array:
// 10 20 30 40 50
// Reversed Array:
// 50 40 30 20 10
}
// Close the Scanner object to release system resources.
scanner
.
close
();
}
}
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