Exception Handling Tasks

1. Division Program :

public class DivisionTest {
    public static void main(String[] args) {
        int a = 10;
        int b = 0;

        int result = a / b;
        System.out.println("Result: " + result);
    }
}

Handled Exception Source code:

public class DivisionTest {
    public static void main(String[] args) {
        int a = 10;
        int b = 0;

        try {
            int result = a / b;
            System.out.println("Result: " + result);
        } 
        catch (ArithmeticException e) {
            System.out.println("Cannot divide by zero");
        }

    }
}

2. Array Index Program :

public class ArrayTest {
    public static void main(String[] args) {
        int arr[] = {10, 20, 30, 40};

        System.out.println(arr[5]);
    }
}

Handled Exception Source code:

public class ArrayTest {
    public static void main(String[] args) {
        try {
            int arr[] = {10, 20, 30, 40};
            System.out.println(arr[5]);
        } catch (ArrayIndexOutOfBoundsException e) {
            //System.out.println("Index 5 out of bounds for length 4");
            System.out.println(e.getMessage());

        }
    }
}

3. String Conversion Program :

public class NumberFormatTest {
    public static void main(String[] args) {
        String s = "ABC";

        int num = Integer.parseInt(s);
        System.out.println(num);
    }
}

Handled Exception Source Code

public class NumberFormatTest {
    public static void main(String[] args) {
        try {
            String s = "ABC";

            int num = Integer.parseInt(s);
            System.out.println(num);
        }
        catch(NumberFormatException e){
            System.out.println("Invalid number format. Cannot convert string to integer.");
        }
    }
}

4. NullPointer Program :

public class NullTest {
    public static void main(String[] args) {
        String name = null;

        System.out.println(name.length());
    }
}

Handled Exception Source Code

public class NullTest {
    public static void main(String[] args) {
        try{
        String name = null;
        System.out.println(name.length());
        }
        catch(NullPointerException e){
            System.out.println(e.getMessage());

        }
    }

}

5. File Reading Program :

public class FileTest {
    public static void main(String[] args) throws Exception {
        FileReader fr = new FileReader("test.txt");

        int data = fr.read();
        System.out.println(data);
    }
}

Handled Exception Source Code

import java.io.FileReader;
import java.io.IOException;

public class FileTest {
    public static void main(String[] args) {
        try {
            FileReader fr = new FileReader("test.txt");

            int data = fr.read();
            System.out.println(data);

        } 
        catch (IOException e) {
            System.out.println("File not found");
        }
    }
}

6. String Index Program :

public class StringIndexTest {
    public static void main(String[] args) {
        String str = "Java";

        System.out.println(str.charAt(10));
    }
}

Handled Exception Source Code

public class StringIndexTest {
    public static void main(String[] args) {
       try {
        String str = "Java";
        System.out.println(str.charAt(10));

       } catch (StringIndexOutOfBoundsException e) {
        System.out.println(e.getMessage());
       }

    }

}

7. Class Casting Program :

public class CastingTest {
    public static void main(String[] args) {
        Object obj = new Integer(10);

        String s = (String) obj;
        System.out.println(s);
    }
}

Handled Exception Source Code

public class CastingTest {
    public static void main(String[] args) {
        try {
            Object obj = new Integer(10);

            String s = (String) obj;
            System.out.println(s);
        } 
        catch (ClassCastException e) {
            System.out.println("Cannot cast Integer to String.");
        }
    }
}

8. Negative Array Size :

public class NegativeArrayTest {
    public static void main(String[] args) {
        int size = -5;

        int arr[] = new int[size];
    }
}

Handled Exception Source Code

public class NegativeArrayTest {
    public static void main(String[] args) {
        try {
            int size = -5;
            int arr[] = new int[size];
        } 
        catch (NegativeArraySizeException e) {
            System.out.println("Array size cannot be negative");
        }
    }
}

9.TreeSet Programs :

public class Test
{
public static void main(String[] args) {
    TreeSet set = new TreeSet();
    set.add(10);
    set.add(30);
    set.add("hari");
    System.out.println(set);
}
}

Handled Exception Source Code

import java.util.TreeSet;

public class Test {
    public static void main(String[] args) {
        try {
            TreeSet set = new TreeSet();
            set.add(10);
            set.add(30);
            set.add("hari");

            System.out.println(set);
        } 
        catch (ClassCastException e) {
            System.out.println("Different data types are not allowed in TreeSet.");
        }
    }
}

10.TreeSet programs :

public class Test
{
public static void main(String[] args) {
    TreeSet set = new TreeSet();
    set.add(20);
    set.add(40);
    set.add(null);

}
}

Handled Exception Source Code

import java.util.TreeSet;

public class Test {
    public static void main(String[] args) {
        try {
            TreeSet set = new TreeSet();
            set.add(20);
            set.add(40);
            set.add(null);

            System.out.println(set);
        } 
        catch (NullPointerException e) {
            System.out.println("Null values are not allowed in TreeSet.");
        }
    }
}