Add files via upload

Author: Oscaarjs

Password.java

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+package Proj1;
+
+public class Password {
+	
+	public static char[] generatePassword() {
+		char[] symbols = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ".toCharArray(); //initializing available symbols
+		int length = (int) (Math.random()*5) + 8;
+		char[] password = new char[length]; //Creating char array for symbols in password
+		
+		
+		for (int i = 0; i < length; i++) {
+			int rnd = (int) (Math.random()*symbols.length);  //Randomizing symbols from available symbols
+			password[i] = symbols[rnd];
+		}
+	   return password;
+		
+	}
+	
+	public static boolean passwordCheck(String password) {
+		if ((password.length() >= 8) &&
+		        (password.length() <= 12)&&             // Checking whether the password matches 
+		        (password.matches(".*[a-z]+.*")) &&     // the given requirments or not
+		        (password.matches(".*[0-9]+.*")) &&
+		        (password.matches(".*[A-Z]+.*")))
+		         return true;
+		     else
+		         return false;
+	}
+    public static void main(String[] cmdln) {
+    	int amount = 0;
+    	int passwordsamounts = 1000;
+    	for(int i = 0; i < passwordsamounts; i++) {             //generating n passwords aswell as checking them
+    		System.out.println(Password.generatePassword());
+    		char[] passarray = generatePassword();
+    		String password = new String(passarray);
+    		
+    		if(passwordCheck(password)==true) {amount++;}
+    	}
+    	System.out.println(amount + " out of "+ passwordsamounts + " passwords met the requirements");
+    }
+}
+
+

Uppgift4.java

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+package Proj1;
+import java.util.Arrays;
+
+public class Uppgift4 {
+
+	 public static int[] addAtIndex(int[] a, int x, int index) {
+		 if(a[index] != 0) {                                // Check's if the desired index is "free"
+			 for(int i = a.length-1; i > index ; i--) {    // If it isnt; starting backwards and moving each elemnt 
+				                                           // To the right
+				 a[i] = a[i-1];
+				 
+			 }
+			 a[index] = x;    // Set's the desired index to the desired number
+		 }
+		 else {
+			 a[index] = x;
+		 }
+		 return a;
+	 }
+	 
+	 public static void main(String[] cmdln) {
+		 int[] arr = {0,1,0,0,0,2,0,1,4,0};
+		 arr = addAtIndex(arr, 9, 5);
+		 System.out.println(Arrays.toString(arr));
+	 }
+}

Uppgift5.java

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+package Proj1;
+
+import java.io.*;
+import java.util.Arrays;
+
+public class Uppgift5 {
+
+	public static void main(String[] cmdln) {
+		int[] symbols = new int[127];   // Initializing array with 127 elements (for each ASCII- symbol)
+		int counter = 0;
+		Arrays.fill(symbols, 0);  // Fills the array with zeros
+
+		try {
+			File filen = new File(cmdln[0]);                   // Importing file
+			FileInputStream fil = new FileInputStream(filen);
+			while (fil.available() > 0) {    // check's so that the file has any symbols left
+				char chartemp = (char) fil.read();  // reading one byte and typecasting it to a char
+				int inttemp = (int) chartemp; // typecasting the char to an int
+				symbols[inttemp] = symbols[inttemp] + 1; // incrementing the "char int" by 1
+				counter++;
+			}
+			System.out.println(Arrays.toString(symbols));
+			fil.close();
+
+			for (int i = 0; i < symbols.length; i++) {
+				double percentage;
+				int amount;
+				char character;
+
+				if (symbols[i] != 0) {
+					character = (char) i;
+					amount = symbols[i];
+					percentage = symbols[i] / (double) counter;
+					System.out.println(character + " occured " + amount + " times, frequency: " + percentage + "%");
+				}
+
+			}
+
+		} catch (Exception e) {
+			System.out.println("Could not find file!");
+		}
+
+	}
+
+}

Uppgift6.java

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+package Proj1;
+
+import java.util.Arrays;
+
+public class Uppgift6 {
+
+	public static int[] mergeArrays(int[] a, int[] b) {
+
+		try {
+			int[] arr = new int[a.length + b.length]; // Initializing new array with the length of a+b
+			int i = 0, j = 0, k = 0;
+			while (i < a.length && j < b.length) { // Comparing elements with eachother and depending
+				if (a[i] < b[j]) { // on which element that is lower than the other
+					arr[k] = a[i]; // we put that element in the new array
+					i++;
+					k++;
+				} else {
+					arr[k] = b[j];
+					j++;
+					k++;
+				}
+
+			}
+
+			if (i < a.length) { // These arraycopy's take what's rest of an array and
+								// Fills the rest of the new array the rest
+				System.arraycopy(a, i, arr, k, (a.length - i));
+			}
+
+			if (j < b.length) {
+
+				System.arraycopy(b, j, arr, k, (b.length - j));
+
+			}
+			return arr;
+
+		} catch (Exception e) {
+			System.out.println("Error occured");
+
+		}
+
+		return null;
+	}
+
+	public static boolean isSorted(int[] a) { // Checking so that the array is sorted
+		try {
+			for (int i = a.length - 1; i > 0; i--) {  
+				if (a[i] < a[i - 1]) {    
+					return false;
+				}
+			}
+		} catch (Exception e) {
+
+		}
+		return true;
+	}
+
+	public static void main(String[] cmdln) {
+		for (int i = 0; i < 20; i++) {
+			int[] a = new int[(int) (Math.random() * 26) + 1];  //Creating arrays with 1-25 elements
+			int[] b = new int[(int) (Math.random() * 26) + 1];
+
+			for (int j = 0; j < a.length; j++) {           // Filling the new arrays with values between 1-100
+				a[j] = (int) (Math.random() * 100) + 1;
+			}
+			for (int j = 0; j < b.length; j++) {
+				b[j] = (int) (Math.random() * 100) + 1;
+			}
+
+			Arrays.sort(a);  // Sorting new arrays
+			Arrays.sort(b);
+
+			int[] c = mergeArrays(a, b);
+			System.out.println(Arrays.toString(c));
+			System.out.println(isSorted(c));
+
+		}
+
+	}
+
+}

Uppgift8.java

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+package Proj1;
+
+import java.util.Scanner;
+import java.io.*;
+import java.util.ArrayList;
+import java.util.Collections;
+
+public class Uppgift8 {
+	public static boolean addToList(ArrayList<String> list, String name) {
+		int index = list.size();
+		for (int i = 0; i < list.size() - 1; i++) {
+			String current = list.get(i).replaceAll("\\s+", "");  //Removing all whitespace in each name
+			String next = list.get(i + 1).replaceAll("\\s+", "");
+			String trimname = name.replaceAll("\\s+", "");
+
+			if (current.equals(trimname)) {  // If the name exists in the list; return false
+				return false;
+
+			} else if (trimname.compareTo(current) > 0) { // Checking which index the name should be placed on
+				if (trimname.compareTo(next) < 0) {
+					index = i + 1;
+				}
+
+			}
+
+		}
+		list.add(index,name);
+		System.out.println(list);
+		return true;
+	}
+
+	
+
+	public static void main(String[] cmdln) {
+		ArrayList<String> klasslista = new ArrayList<String>();
+		String[] names = { "Amanda	Andersson", "Donald Trumpeten", "Janne Bildoktor", "Oscar Johansson",
+				"Gustav Andersson", "Zorro Zorrosson", "Zzueen Queeson" };
+
+		try {
+			File fil = new File(cmdln[0]);      // Creating an arraylist with the different names
+			Scanner scan = new Scanner(fil);
+			while (scan.hasNext()) {
+				String s = scan.nextLine();
+				klasslista.add(s);
+
+			}
+			Collections.sort(klasslista);  // Sorting the list alphabetically 
+
+			for (int i = 0; i < names.length; i++) {
+
+				addToList(klasslista, names[i]);
+
+			}
+
+			scan.close();
+		} catch (Exception e) {
+			System.out.println("Cant Find File");
+		}
+
+	}
+
+}