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louiscklaw
2025-01-31 19:15:17 +08:00
parent 09adae8c8e
commit 6c60a73f30
1546 changed files with 286918 additions and 0 deletions
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16
_resources/it114105/itp4510/Lab02/Lab2.1/q3/Divide.java Normal file
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import java.util.Random;
public class Divide {
public static void main(String[] args) {
int a, n;
for (int i = 0; i < 10; i++) {
try{
n = (int) (Math.random() * 10);
a = 100 / n;
System.out.println("n:" + n + ", a:" + a);
}catch(ArithmeticException e){
System.out.println("Division by Zero");
}
}
}
}

21
_resources/it114105/itp4510/Lab02/Lab2.1/q4/ReadTextFile.java Normal file
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import java.util.*;
import java.io.*;
public class ReadTextFile {
public static void main(String[] args) {
String filename = "";
String line;
try {
filename = args[0];
Scanner fin = new Scanner(new File(filename));
while (fin.hasNextLine()) {
line = fin.nextLine();
System.out.println(line);
}
} catch (ArrayIndexOutOfBoundsException e) {
System.out.println("Usage: java ReadTextFile <filename>");
} catch (FileNotFoundException e) {
System.out.println("Failed to open file " + filename);
}
}
}

17
_resources/it114105/itp4510/Lab02/Lab2.1/q5/README.md.original Normal file
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#### Question 1
| Exception class | IOException/ RuntimeException |
|--------------------------------|-------------------------------|
| ArithmeticException | RuntimeException |
| EOFException | IOException |
| FileNotFoundException | IOException |
| ArrayIndexOutOfBoundsException | RuntimeException |
| NumberFormatException | RuntimeException |
| InputMismatchException | RuntimeException |
| NUllPointerExpcetion | RuntimeExpcetion |
#### Question 2
(a) NullPointerException
(b) ArrayIndexOutOfBoundsException
(c) ArithmeticException(divide by zero)

50
_resources/it114105/itp4510/Lab02/Lab2.1/q5/a/InputParsing.java Normal file
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import javax.swing.JOptionPane;
public class InputParsing {
public static void main(String[] args) {
String input;
int num = 0;
int total = 0;
int average = 0;
int[] a = { 80, 60, 72, 85, 90 };
String output;
output = "The 5 marks are:";
for (int i = 0; i < 5; i++)
output += " " + a[i];
output += "\nAverage of how many numbers?";
input = JOptionPane.showInputDialog(output);
try {
System.out.println("Input length = " + input.length());
num = Integer.parseInt(input);
if (num == 0)
throw new ArithmeticException();
if (num == -1)
throw new NegativeNumberException();
total = 0;
for (int i = 0; i < num; i++)
total += a[i];
average = total / num;
} catch (ArrayIndexOutOfBoundsException e) {
System.out.println("No more than 5 please!");
} catch (NumberFormatException e) {
System.out.println("Integer please!");
} catch (NullPointerException e) {
System.out.println("Input length = 0; cancelled");
} catch (NegativeNumberException e) {
System.out.println(e.getMessage());
} catch (ArithmeticException e) {
System.out.println("Don't input zero!");
} catch (RuntimeException e) {
System.out.println("Run time error!");
e.printStackTrace();
return;
} catch (Exception e) {
System.out.println("Something wrong!");
e.printStackTrace();
} finally {
System.out.println("Number = " + num);
}
System.out.println("Average over first " + num + " numbers = " + average);
}
}

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_resources/it114105/itp4510/Lab02/Lab2.1/q5/b/InputParsing.java Normal file
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import javax.swing.JOptionPane;
public class InputParsing {
public static void main(String[] args) {
String input;
int[] a = { 80, 60, 72, 85, 90 };
String output;
output = "The 5 marks are:";
for (int i = 0; i < 5; i++)
output += " " + a[i];
output += "\nAverage of how many numbers?";
do {
input = JOptionPane.showInputDialog(output);
try {
parseInput(a, input);
} catch (Exception e) {
System.out.println("Number should be in 1 to 5!");
}
} while (JOptionPane.showConfirmDialog(null, "Enter again?", "elect an option",
JOptionPane.OK_CANCEL_OPTION) == JOptionPane.OK_OPTION);
}
public static void parseInput(int[] a, String input) {
int num = 0;
int total = 0;
int average = 0;
try {
System.out.println("Input length = " + input.length());
num = Integer.parseInt(input);
if (num == 0)
throw new ArithmeticException();
if (num == -1)
throw new NegativeNumberException();
total = 0;
for (int i = 0; i < num; i++)
total += a[i];
average = total / num;
} catch (ArrayIndexOutOfBoundsException e) {
System.out.println("No more than 5 please!");
throw e;
} catch (NumberFormatException e) {
System.out.println("Integer please!");
} catch (NullPointerException e) {
System.out.println("Input length = 0; cancelled");
} catch (NegativeNumberException e) {
System.out.println(e.getMessage());
throw e;
} catch (ArithmeticException e) {
System.out.println("Don't input zero!");
throw e;
} catch (RuntimeException e) {
System.out.println("Run time error!");
e.printStackTrace();
return;
} catch (Exception e) {
System.out.println("Something wrong!");
e.printStackTrace();
} finally {
System.out.println("Number = " + num);
}
System.out.println("Average over first " + num + " numbers = " + average);
}
}

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_resources/it114105/itp4510/Lab02/Lab2.1/q5/b/NegativeNumberException.java Normal file
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public class NegativeNumberException extends ArithmeticException {
public NegativeNumberException() {
super("No negative number please!");
}
}