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Java/07-Java-Programs/059-Hollow-Rectangle-Pattern.java at main · shaikbasha-dev/Java · GitHub
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059-Hollow-Rectangle-Pattern.java
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/*
* ============================================================================
* Program Name : Hollow Rectangle Pattern
* File Name : 059-Hollow-Rectangle-Pattern.java
* Class Name : HollowRectanglePattern
*
* Description:
* This program accepts the number of rows and columns from the user
* and prints a Hollow Rectangle Star Pattern using nested for loops.
*
* Objective:
* - Understand user input using the Scanner class.
* - Learn how to use nested for loops.
* - Print a Hollow Rectangle Star Pattern.
*
* Author : Shaik Mahaboob Basha
* Repository : 01-Core-Java
* Folder : 08-Java-Programs
* ============================================================================
*/
import
java
.
util
.
Scanner
;
public
class
HollowRectanglePattern
{
// 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 number of rows.
System
.
out
.
print
(
"Enter the Number of Rows: "
);
// Read the number of rows entered by the user.
int
rows
=
scanner
.
nextInt
();
// Ask the user to enter the number of columns.
System
.
out
.
print
(
"Enter the Number of Columns: "
);
// Read the number of columns entered by the user.
int
columns
=
scanner
.
nextInt
();
// Check whether the entered values are valid.
if
(
rows
<=
0
||
columns
<=
0
) {
// Display an error message.
System
.
out
.
println
(
"Please enter positive integers for rows and columns."
);
// Example Output:
// Please enter positive integers for rows and columns.
}
else
{
// Display the heading.
System
.
out
.
println
(
"Hollow Rectangle Pattern:"
);
// Outer loop controls the number of rows.
for
(
int
i
=
1
;
i
<=
rows
;
i
++) {
// Inner loop controls the number of columns.
for
(
int
j
=
1
;
j
<=
columns
;
j
++) {
// Check whether the current position is on the border.
if
(
i
==
1
||
i
==
rows
||
j
==
1
||
j
==
columns
) {
// Print a star for the border.
System
.
out
.
print
(
"* "
);
}
else
{
// Print spaces inside the rectangle.
System
.
out
.
print
(
" "
);
}
}
// Move to the next line after printing one row.
System
.
out
.
println
();
}
// Example Output:
// Enter the Number of Rows: 5
// Enter the Number of Columns: 6
// Hollow Rectangle Pattern:
// * * * * * *
// * *
// * *
// * *
// * * * * * *
}
// Close the Scanner object to release system resources.
scanner
.
close
();
}
}
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