![/*
* The java program that reads an input file input.txt
* and then reads the contens of file.
* the program throws file not found exception if file not found.
* The program throws DimensionMismatchException if mismatch of dimension.
* The program throws NumberFormatException if mismatch of data read.
* */
//FormatChecker.java
import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
public class FormatChecker {
public static void main(String[] args) {
String fileName="input.txt";
//calling checkFormat
checkFormat(fileName);
}
//Method checkFormat that takes string and check for
//errors otherwise reads the file and print to console
private static void checkFormat(String fileName) {
Scanner filescanner=null;
try {
//thorws FileNotFoundException error if file not found
filescanner=new Scanner(new File(fileName));
} catch (FileNotFoundException e) {
System.out.println(e.getMessage());
}
int rows=0;
int cols=0;
double[][] arr;](https://image.slidesharecdn.com/thejavaprogramthatreadsaninputfileinput-230408100738-606c3cc4/85/The-java-program-that-reads-an-input-file-input-txt-an-pdf-1-320.jpg)
![String dimensions[]=filescanner.nextLine().split(" ");
try
{
//thorws DimensionMismatchException error if mismatch of dimension
if(dimensions.length>2)
throw new DimensionMismatchException("Dimension mismatch");
} catch (DimensionMismatchException e1) {
e1.printStackTrace();
}
try {
//thorws NumberFormatException error if mismatch of reading values
rows=Integer.parseInt(dimensions[0]);
cols=Integer.parseInt(dimensions[1]);
arr=new double[rows][cols];
System.out.println("File contents");
for (int i = 0; i < arr.length; i++)
{
for (int j = 0; j < arr[i].length; j++)
{
arr[i][j]=filescanner.nextDouble();
System.out.printf("%6.1f",arr[i][j]);
}
System.out.println();
}
} catch (NumberFormatException e) {
System.out.println(e.getMessage());
}](https://image.slidesharecdn.com/thejavaprogramthatreadsaninputfileinput-230408100738-606c3cc4/85/The-java-program-that-reads-an-input-file-input-txt-an-pdf-2-320.jpg)
![* The java program that reads an input file input.txt
* and then reads the contens of file.
* the program throws file not found exception if file not found.
* The program throws DimensionMismatchException if mismatch of dimension.
* The program throws NumberFormatException if mismatch of data read.
* */
//FormatChecker.java
import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
public class FormatChecker {
public static void main(String[] args) {
String fileName="input.txt";
//calling checkFormat
checkFormat(fileName);
}
//Method checkFormat that takes string and check for
//errors otherwise reads the file and print to console
private static void checkFormat(String fileName) {
Scanner filescanner=null;
try {
//thorws FileNotFoundException error if file not found
filescanner=new Scanner(new File(fileName));
} catch (FileNotFoundException e) {
System.out.println(e.getMessage());
}
int rows=0;
int cols=0;
double[][] arr;
String dimensions[]=filescanner.nextLine().split(" ");](https://image.slidesharecdn.com/thejavaprogramthatreadsaninputfileinput-230408100738-606c3cc4/85/The-java-program-that-reads-an-input-file-input-txt-an-pdf-4-320.jpg)
![try
{
//thorws DimensionMismatchException error if mismatch of dimension
if(dimensions.length>2)
throw new DimensionMismatchException("Dimension mismatch");
} catch (DimensionMismatchException e1) {
e1.printStackTrace();
}
try {
//thorws NumberFormatException error if mismatch of reading values
rows=Integer.parseInt(dimensions[0]);
cols=Integer.parseInt(dimensions[1]);
arr=new double[rows][cols];
System.out.println("File contents");
for (int i = 0; i < arr.length; i++)
{
for (int j = 0; j < arr[i].length; j++)
{
arr[i][j]=filescanner.nextDouble();
System.out.printf("%6.1f",arr[i][j]);
}
System.out.println();
}
} catch (NumberFormatException e) {
System.out.println(e.getMessage());
}](https://image.slidesharecdn.com/thejavaprogramthatreadsaninputfileinput-230408100738-606c3cc4/85/The-java-program-that-reads-an-input-file-input-txt-an-pdf-5-320.jpg)
The java program that reads an input file input.txt an.pdf
- 1. /* * The java program that reads an input file input.txt * and then reads the contens of file. * the program throws file not found exception if file not found. * The program throws DimensionMismatchException if mismatch of dimension. * The program throws NumberFormatException if mismatch of data read. * */ //FormatChecker.java import java.io.File; import java.io.FileNotFoundException; import java.util.Scanner; public class FormatChecker { public static void main(String[] args) { String fileName="input.txt"; //calling checkFormat checkFormat(fileName); } //Method checkFormat that takes string and check for //errors otherwise reads the file and print to console private static void checkFormat(String fileName) { Scanner filescanner=null; try { //thorws FileNotFoundException error if file not found filescanner=new Scanner(new File(fileName)); } catch (FileNotFoundException e) { System.out.println(e.getMessage()); } int rows=0; int cols=0; double[][] arr;
- 2. String dimensions[]=filescanner.nextLine().split(" "); try { //thorws DimensionMismatchException error if mismatch of dimension if(dimensions.length>2) throw new DimensionMismatchException("Dimension mismatch"); } catch (DimensionMismatchException e1) { e1.printStackTrace(); } try { //thorws NumberFormatException error if mismatch of reading values rows=Integer.parseInt(dimensions[0]); cols=Integer.parseInt(dimensions[1]); arr=new double[rows][cols]; System.out.println("File contents"); for (int i = 0; i < arr.length; i++) { for (int j = 0; j < arr[i].length; j++) { arr[i][j]=filescanner.nextDouble(); System.out.printf("%6.1f",arr[i][j]); } System.out.println(); } } catch (NumberFormatException e) { System.out.println(e.getMessage()); }
- 3. } } ------------------------------------------------------------------------ //User defined DimensionMismatchException class //that extends the Exception class //DimensionMismatchException.java public class DimensionMismatchException extends Exception { public DimensionMismatchException(String msg) { super(msg); } } ------------------------------------------------------------------------ input.txt 5 6 2.5 0 1 0 0 0 0 -1 4 0 0 0 0 0 0 0 1.1 0 0 2 0 0 5 0 0 -3.14 0 0 0 0 ------------------------------------------------------------------------ File contents 2.5 0.0 1.0 0.0 0.0 0.0 0.0 -1.0 4.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.1 0.0 0.0 2.0 0.0 0.0 5.0 0.0 0.0 -3.1 0.0 0.0 0.0 0.0 Note : DimensionMismatchException class is included Solution /*
- 4. * The java program that reads an input file input.txt * and then reads the contens of file. * the program throws file not found exception if file not found. * The program throws DimensionMismatchException if mismatch of dimension. * The program throws NumberFormatException if mismatch of data read. * */ //FormatChecker.java import java.io.File; import java.io.FileNotFoundException; import java.util.Scanner; public class FormatChecker { public static void main(String[] args) { String fileName="input.txt"; //calling checkFormat checkFormat(fileName); } //Method checkFormat that takes string and check for //errors otherwise reads the file and print to console private static void checkFormat(String fileName) { Scanner filescanner=null; try { //thorws FileNotFoundException error if file not found filescanner=new Scanner(new File(fileName)); } catch (FileNotFoundException e) { System.out.println(e.getMessage()); } int rows=0; int cols=0; double[][] arr; String dimensions[]=filescanner.nextLine().split(" ");
- 5. try { //thorws DimensionMismatchException error if mismatch of dimension if(dimensions.length>2) throw new DimensionMismatchException("Dimension mismatch"); } catch (DimensionMismatchException e1) { e1.printStackTrace(); } try { //thorws NumberFormatException error if mismatch of reading values rows=Integer.parseInt(dimensions[0]); cols=Integer.parseInt(dimensions[1]); arr=new double[rows][cols]; System.out.println("File contents"); for (int i = 0; i < arr.length; i++) { for (int j = 0; j < arr[i].length; j++) { arr[i][j]=filescanner.nextDouble(); System.out.printf("%6.1f",arr[i][j]); } System.out.println(); } } catch (NumberFormatException e) { System.out.println(e.getMessage()); }
- 6. } } ------------------------------------------------------------------------ //User defined DimensionMismatchException class //that extends the Exception class //DimensionMismatchException.java public class DimensionMismatchException extends Exception { public DimensionMismatchException(String msg) { super(msg); } } ------------------------------------------------------------------------ input.txt 5 6 2.5 0 1 0 0 0 0 -1 4 0 0 0 0 0 0 0 1.1 0 0 2 0 0 5 0 0 -3.14 0 0 0 0 ------------------------------------------------------------------------ File contents 2.5 0.0 1.0 0.0 0.0 0.0 0.0 -1.0 4.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.1 0.0 0.0 2.0 0.0 0.0 5.0 0.0 0.0 -3.1 0.0 0.0 0.0 0.0 Note : DimensionMismatchException class is included