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Java/07-Java-Programs/073-Matrix-Multiplication.java at main · shaikbasha-dev/Java · GitHub
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/*
* ============================================================================
* Program Name : Matrix Multiplication
* File Name : 073-Matrix-Multiplication.java
* Class Name : MatrixMultiplication
*
* Description:
* This program accepts two matrices from the user and performs
* matrix multiplication if the matrices are compatible.
*
* Objective:
* - Understand user input using the Scanner class.
* - Learn how to perform matrix multiplication using nested loops.
* - Display the resultant matrix after multiplication.
*
* Author : Shaik Mahaboob Basha
* Repository : 01-Core-Java
* Folder : 08-Java-Programs
* ============================================================================
*/
import
java
.
util
.
Scanner
;
public
class
MatrixMultiplication
{
// 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 for the first matrix.
System
.
out
.
print
(
"Enter the Number of Rows for First Matrix: "
);
// Read the number of rows.
int
rows1
=
scanner
.
nextInt
();
// Ask the user to enter the number of columns for the first matrix.
System
.
out
.
print
(
"Enter the Number of Columns for First Matrix: "
);
// Read the number of columns.
int
columns1
=
scanner
.
nextInt
();
// Ask the user to enter the number of rows for the second matrix.
System
.
out
.
print
(
"Enter the Number of Rows for Second Matrix: "
);
// Read the number of rows.
int
rows2
=
scanner
.
nextInt
();
// Ask the user to enter the number of columns for the second matrix.
System
.
out
.
print
(
"Enter the Number of Columns for Second Matrix: "
);
// Read the number of columns.
int
columns2
=
scanner
.
nextInt
();
// Check whether the entered matrix dimensions are valid.
if
(
rows1
<=
0
||
columns1
<=
0
||
rows2
<=
0
||
columns2
<=
0
) {
// Display an error message.
System
.
out
.
println
(
"Please enter positive values for rows and columns."
);
}
// Check whether the matrices are compatible for multiplication.
else
if
(
columns1
!=
rows2
) {
// Display an error message.
System
.
out
.
println
(
"Matrix multiplication is not possible."
);
System
.
out
.
println
(
"The number of columns of the first matrix must be equal to the number of rows of the second matrix."
);
}
else
{
// Declare the first matrix.
int
[][]
matrix1
=
new
int
[
rows1
][
columns1
];
// Declare the second matrix.
int
[][]
matrix2
=
new
int
[
rows2
][
columns2
];
// Declare the result matrix.
int
[][]
result
=
new
int
[
rows1
][
columns2
];
// Ask the user to enter the elements of the first matrix.
System
.
out
.
println
(
"Enter the Elements of First Matrix:"
);
// Read the first matrix elements.
for
(
int
i
=
0
;
i
<
rows1
;
i
++) {
for
(
int
j
=
0
;
j
<
columns1
;
j
++) {
// Store the current element.
matrix1
[
i
][
j
] =
scanner
.
nextInt
();
}
}
// Ask the user to enter the elements of the second matrix.
System
.
out
.
println
(
"Enter the Elements of Second Matrix:"
);
// Read the second matrix elements.
for
(
int
i
=
0
;
i
<
rows2
;
i
++) {
for
(
int
j
=
0
;
j
<
columns2
;
j
++) {
// Store the current element.
matrix2
[
i
][
j
] =
scanner
.
nextInt
();
}
}
// Perform matrix multiplication.
for
(
int
i
=
0
;
i
<
rows1
;
i
++) {
for
(
int
j
=
0
;
j
<
columns2
;
j
++) {
// Initialize the current result element.
result
[
i
][
j
] =
0
;
// Multiply corresponding elements and accumulate the sum.
for
(
int
k
=
0
;
k
<
columns1
;
k
++) {
result
[
i
][
j
] =
result
[
i
][
j
] + (
matrix1
[
i
][
k
] *
matrix2
[
k
][
j
]);
}
}
}
// Display the first matrix.
System
.
out
.
println
(
"First Matrix:"
);
for
(
int
i
=
0
;
i
<
rows1
;
i
++) {
for
(
int
j
=
0
;
j
<
columns1
;
j
++) {
System
.
out
.
print
(
matrix1
[
i
][
j
] +
" "
);
}
System
.
out
.
println
();
}
// Display the second matrix.
System
.
out
.
println
(
"Second Matrix:"
);
for
(
int
i
=
0
;
i
<
rows2
;
i
++) {
for
(
int
j
=
0
;
j
<
columns2
;
j
++) {
System
.
out
.
print
(
matrix2
[
i
][
j
] +
" "
);
}
System
.
out
.
println
();
}
// Display the resultant matrix.
System
.
out
.
println
(
"Resultant Matrix After Multiplication:"
);
for
(
int
i
=
0
;
i
<
rows1
;
i
++) {
for
(
int
j
=
0
;
j
<
columns2
;
j
++) {
System
.
out
.
print
(
result
[
i
][
j
] +
" "
);
}
System
.
out
.
println
();
}
// Example Output:
// Enter the Number of Rows for First Matrix: 2
// Enter the Number of Columns for First Matrix: 2
// Enter the Number of Rows for Second Matrix: 2
// Enter the Number of Columns for Second Matrix: 2
// Enter the Elements of First Matrix:
// 1 2
// 3 4
// Enter the Elements of Second Matrix:
// 5 6
// 7 8
// Resultant Matrix After Multiplication:
// 19 22
// 43 50
}
// Close the Scanner object to release system resources.
scanner
.
close
();
}
}
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