I want to be straightforward on this topic on how to Handle Multi-Dimentional Variable Arrays in Java.
This variable array, composed of 2 rows and 5 columns as you can see below
// int[][] A = new int[2][5];
can be initial initialize with the following array values
int[][] A = { { 1, 0, 12, -1, 9 }, // First Row
{ 7, -3, 2, 5, 10 } // Second Row
};
Here’s the better figure for your deeper comprehension.
Source: http://math.hws.edu/javanotes/c7/s5.html
But this time, I am dealing with 2 x 5 matrix.
Printing Individual Variable Value
To print a particular a particular element from Row 1, let say we want to print “12”,
Just add this line after variable declaration
System.out.println(A[0][2]) // [0] means, First Row and [2] means 3rd element in the First Row
// This will print "12"
Printing Values in Each Rows and Columns
public class TwoDimentionalArray {
public static void main( String args[] ) {
try {
// int[][] A = new int[2][5];
int[][] A = { { 1, 0, 12, -1, 9 },
{ 7, -3, 2, 5, 10 }
};
for (int i = 0; i < A[0].length; i++) {
TextIO.put(A[0][i] + "\t"); // Printing all values in the First Row
TextIO.putln(A[1][i]); // Printing all values in the Second Row
}
} catch ( ArrayIndexOutOfBoundsException e ) {TextIO.putln("Exceeded!"); }
}
}
To Handle all Variable Arrays in one line
public class ArrayMultidimensional {
public static void main( String args[] ) {
try {
// int[][] A = new int[2][5];
int[][] A = { { 1, 0, 12, -1, 9 },
{ 7, -3, 2, 5, 10 }
};
for (int i = 0; i < A.length; i++) {
for (int j = 0; j < 5; j++) {
TextIO.putln( A[i][j]);
}
}
} catch ( ArrayIndexOutOfBoundsException e ) {System.out.println("Exceed"); }
}
}
Storing values in Variable arrays will save you time to handle many variables. In Java, there’s no other method on dealing with large variables. I used to program using TextIO, which you can also replace it with System.out.print as a native class in Java package.
