String[] messages = {
    "IV2941 security",
    "Security is fun",
    // ... more messages
};

String[] messages = {
    "IV2941 security",
    "Security is fun",
    // ... more messages
};

for (String message : messages) {
    try {
    MessageDigest md = MessageDigest.getInstance("SHA-256");     // …
    // hash the message, find collisions
    } catch (NoSuchAlgorithmException e) {
        // handle error
    }
}

for (String message : messages) {
    try {
    MessageDigest md = MessageDigest.getInstance("SHA-256");     // …
    // hash the message, find collisions
    } catch (NoSuchAlgorithmException e) {
        // handle error
    }
}

try {
    for (String message : messages) {
         MessageDigest md = MessageDigest.getInstance("SHA-256");         
        // …
        // hash the message, find collisions
    }
} catch (NoSuchAlgorithmException e) {
    // handle error
}

try {
    for (String message : messages) {
         MessageDigest md = MessageDigest.getInstance("SHA-256");         
        // …
        // hash the message, find collisions
    }
} catch (NoSuchAlgorithmException e) {
    // handle error
}

import java.io.*;
import java.util.*;

public class StreamCipher {

    public static void main(String[] args) {
        int counter = 0;
        int seed = 0;
        String input = null;
        String output = null;
        Random rnd = new Random(seed);

        System.out.println("Command line arguments received: " + Arrays.toString(args)); // Print all arguments

        while (counter < args.length){
            switch (args[counter]) {
                case "--key":
                    String key = args[counter + 1];
                    System.out.println("Key argument (before parsing): '" + key + "'"); // Print key before parsing
                    seed = Integer.parseInt(key);
                    System.out.println("Seed value after parsing: " + seed); // Print seed after parsing (if successful)
                    counter = counter + 2;
                    break;
                case "--in":
                    input = args[counter + 1];
                    counter = counter + 2;
                    break;
                case "--out":
                    output = args[counter + 1];
                    counter = counter + 2;
                    break;
                default:
                    counter = counter + 1;
                    break;
                }
            }

        // ... rest of the code (file input/output and cipher logic) ...
    }

    // ... cipher, decipher, xor methods ...
}

import java.io.*;
import java.util.*;

public class StreamCipher {

    public static void main(String[] args) {
        int counter = 0;
        int seed = 0;
        String input = null;
        String output = null;
        Random rnd = new Random(seed);

        System.out.println("Command line arguments received: " + Arrays.toString(args)); // Print all arguments

        while (counter < args.length){
            switch (args[counter]) {
                case "--key":
                    String key = args[counter + 1];
                    System.out.println("Key argument (before parsing): '" + key + "'"); // Print key before parsing
                    seed = Integer.parseInt(key);
                    System.out.println("Seed value after parsing: " + seed); // Print seed after parsing (if successful)
                    counter = counter + 2;
                    break;
                case "--in":
                    input = args[counter + 1];
                    counter = counter + 2;
                    break;
                case "--out":
                    output = args[counter + 1];
                    counter = counter + 2;
                    break;
                default:
                    counter = counter + 1;
                    break;
                }
            }

        // ... rest of the code (file input/output and cipher logic) ...
    }

    // ... cipher, decipher, xor methods ...
}

java StreamCipher --key $(<key.txt) --in plain.txt --out cipher-test.data

java StreamCipher --key $(<key.txt) --in plain.txt --out cipher-test.data

public Constraint workPercentage(ConstraintFactory constraintFactory) {
    return constraintFactory.forEach(Employee.class)
            .join(Shift.class, equal(Employee::getName, Shift::getEmployee))
            .groupBy(
                    (employee, shift) -> employee,
                    ConstraintCollectors.sumDuration((employee, shift) -> 
                        Duration.between(shift.getStart(), shift.getEnd()))
                )
            .filter((employee, totalWorkedHours) -> {
                double fullTimeHours = 40.0;
                double desiredHours = employee.getWorkPercentage() * fullTimeHours;
                return totalWorkedHours.toHours() != desiredHours;
            })
            .penalize(HardSoftBigDecimalScore.ONE_HARD, (employee, totalWorkedHours) -> {
                return (int) totalWorkedHours.toHours() - employee.getWorkPercentage() * 40;
            })
            .asConstraint("Employee work percentage not matched");
}

public Constraint workPercentage(ConstraintFactory constraintFactory) {
    return constraintFactory.forEach(Employee.class)
            .join(Shift.class, equal(Employee::getName, Shift::getEmployee))
            .groupBy(
                    (employee, shift) -> employee,
                    ConstraintCollectors.sumDuration((employee, shift) -> 
                        Duration.between(shift.getStart(), shift.getEnd()))
                )
            .filter((employee, totalWorkedHours) -> {
                double fullTimeHours = 40.0;
                double desiredHours = employee.getWorkPercentage() * fullTimeHours;
                return totalWorkedHours.toHours() != desiredHours;
            })
            .penalize(HardSoftBigDecimalScore.ONE_HARD, (employee, totalWorkedHours) -> {
                return (int) totalWorkedHours.toHours() - employee.getWorkPercentage() * 40;
            })
            .asConstraint("Employee work percentage not matched");
}

public Constraint workPercentage(ConstraintFactory constraintFactory) {
    return constraintFactory.forEach(Employee.class)
            .join(Shift.class, equal(Employee::getName, Shift::getEmployee))
            .groupBy(Employee::getName, 
                    ConstraintCollectors.sum(shift -> 
                        Duration.between(shift.getStart(), shift.getEnd()).toHours()))
            // ... rest of constraint
}

public Constraint workPercentage(ConstraintFactory constraintFactory) {
    return constraintFactory.forEach(Employee.class)
            .join(Shift.class, equal(Employee::getName, Shift::getEmployee))
            .groupBy(Employee::getName, 
                    ConstraintCollectors.sum(shift -> 
                        Duration.between(shift.getStart(), shift.getEnd()).toHours()))
            // ... rest of constraint
}

public static Int positiveInts (Int[] n)
{
int noOfPositive = 0;
for(int i = 0; i < n.length; i++){
if( n[i].lessThan(0)) break; else (noOfPositive++)}
return noOfPositive;
}

public static Int positiveInts (Int[] n)
{
int noOfPositive = 0;
for(int i = 0; i < n.length; i++){
if( n[i].lessThan(0)) break; else (noOfPositive++)}
return noOfPositive;
}

Open the text editor TextPad (Start - TextPad 8, with the letter T). Create a class called Demo. Type the following:
// Demo.java
class Demo {
}
.
Save the text in a file called Demo.java. Create a directory on a suitable drive (for example, the C drive) and save the file there. The directory can be called, for example, programming. On the school's computers, the file is saved on the H drive. Create there a directory called programming and the directory ovens in it.
Add the main method to the Demo class. Expand the program like this:

// Demo.java
class Demo {
public static void main (String[] args) {
}
}
"

Open the text editor TextPad (Start - TextPad 8, with the letter T). Create a class called Demo. Type the following:
// Demo.java
class Demo {
}
.
Save the text in a file called Demo.java. Create a directory on a suitable drive (for example, the C drive) and save the file there. The directory can be called, for example, programming. On the school's computers, the file is saved on the H drive. Create there a directory called programming and the directory ovens in it.
Add the main method to the Demo class. Expand the program like this:

// Demo.java
class Demo {
public static void main (String[] args) {
}
}
"