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Borrowbook

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+
+public class Library {
+    String address;
+    java.util.ArrayList<Book> books;
+
+    public static final String openTime = "9am";
+    public static final String closeTime = "5pm";
+
+    public Library(String libraryAddress) {
+        address = libraryAddress;
+        books = new java.util.ArrayList<Book>();
+    }
+
+    public void addBook(Book book) {
+        books.add(book);
+    }
+
+    public static void printOpeningHours() {
+        System.out.println("Libraries are open daily from " + openTime + " to " + closeTime);
+    }
+
+    public void printAddress() {
+        System.out.println(address);
+    }
+
+    public void printAvailableBooks() {
+        boolean bookPresent = false;
+        for (Book book : books) {
+            if (!book.isBorrowed()) {
+                System.out.println(book.getTitle());
+                bookPresent = true;
+            }
+        }
+        if (!bookPresent) {
+            System.out.println("No book in catalog");
+        }
+    }
+
+    public void borrowBook(String title) {
+        int found = 0;
+        for (Book book : books) {
+            if (book.getTitle().equals(title)) {
+                if (found == 0) {
+                    found = 1;
+                    }
+                if (!book.isBorrowed()) {
+                    book.borrowed();
+                    found = 2;
+                    break;
+                };
+            }
+        }
+        if (found == 0) {
+            System.out.println("Sorry, this book is not in our catalog.");
+        } else if (found == 1) {
+            System.out.println("Sorry, this book is already borrowed.");
+        } else if (found == 2) {
+            System.out.println("You successfully borrowed " + title);
+        }
+    }
+
+    public void returnBook(String title) {
+        boolean found = false;
+        for (Book book : books) {
+            if (book.getTitle().equals(title) && book.isBorrowed()) {
+                book.returned();
+                found = true;
+                break;
+            }
+        }
+        if (found) {
+           System.out.println("You successfully returned " + title);
+        }
+    }
+
+    public static void main(String[] args) {
+        // Create two libraries
+        Library firstLibrary = new Library("10 Main St.");
+        Library secondLibrary = new Library("228 Liberty St.");
+
+        // Add four books to the first library
+        firstLibrary.addBook(new Book("The Da Vinci Code"));
+        firstLibrary.addBook(new Book("Le Petit Prince"));
+        firstLibrary.addBook(new Book("A Tale of Two Cities"));
+        firstLibrary.addBook(new Book("The Lord of the Rings"));
+
+        // Print opening hours and the addresses
+        System.out.println("Library hours:");
+        printOpeningHours();
+        System.out.println();
+
+        System.out.println("Library addresses:");
+        firstLibrary.printAddress();
+        secondLibrary.printAddress();
+        System.out.println();
+        System.out.println("Borrow Percyjackson s:");
+        firstLibrary.borrowBook("Percyjackson");
+        firstLibrary.borrowBook("Percyjackson");
+        secondLibrary.borrowBook("Percyjackson");
+        System.out.println();
+
+        // Print the titles of all available books from both libraries
+        System.out.println("Books available in the first library:");
+        firstLibrary.printAvailableBooks();
+        System.out.println();
+        System.out.println("Books available in the second library:");
+        secondLibrary.printAvailableBooks();
+        System.out.println();
+
+        // Return 
+        System.out.println("Returning The Lord of the Rings:");
+        firstLibrary.returnBook("The Lord of the Rings");
+        System.out.println();
+
+        // Print the titles of available from the first library
+        System.out.println("Books available in the first library:");
+        firstLibrary.printAvailableBooks();
+    }
+} 

week 4/Exercise 4.1.java

@@ -1,15 +1,3 @@
 // The following is the declaration of the main class named Question42
-public class Question42 { 
-	public static void main(String args[]){
-		int year; // integer type variable to store year	
-
-		// Create an object of Calendar class. 
-		java.util.Calendar current;
-		// Use getInstance() method to initialize the Calendar object.
-		current=java.util.Calendar.getInstance();
-		// Initialize the int variable year with the current year 
-		year= current.get(java.util.Calendar.YEAR);
-		// Print the current Year
-		System.out.println("Current Year: "+year);
-	}  
-}
+import static java.lang.System.out;
+import java.util.Scanner;

week 7/program 1

@@ -0,0 +1,11 @@
+// Write the appropriate statement(s) to import the package(s) you need in your program 
+//ONLY SPECIFIC CODE SNIPPET IS GIVEN BECAUSE I WAS LAZY!!
+import java.util.*;
+public class Question1{
+public static void main (String[] args){
+//Write the appropriate code to read the 3 integer values and find their sum.
+  Scanner obj = new Scanner(System.in);
+int a = obj.nextInt();
+int b = obj.nextInt();
+int c = obj.nextInt(); int sum = a+b+c;
+

week 7/program 2

@@ -0,0 +1,11 @@
+//Use appropriate Try..catch block to complete the code 
+//ONLY SPECIFIC CODE SNIPPET IS GIVEN BECAUSE I WAS LAZY!!
+try{
+InputStreamReader r=new InputStreamReader(System.in);
+ BufferedReader br=new BufferedReader(r);
+String number=br.readLine();
+int x = Integer.parseInt(number);
+System.out.print(x*x); 
+}catch(Exception e){
+System.out.print("Please enter valid data");
+}

week 7/program 3

@@ -0,0 +1,5 @@
+// Complete the code to get specific indexed byte value and its corresponding char value
+////ONLY SPECIFIC CODE SNIPPET IS GIVEN BECAUSE I WAS LAZY!!
+System.out.println(barr[n]);
+System.out.print((char)barr[n]); }
+

week 7/program 4

@@ -0,0 +1,9 @@
+  //Write your code here to count the number of vowels in the string "s1"     
+  ////ONLY SPECIFIC CODE SNIPPET IS GIVEN BECAUSE I WAS LAZY!!
+     s1 = s1.toLowerCase();
+for(int i=0;i<s1.length();i++){
+char word = s1.charAt(i);
+if(word =='a' || word == 'e' || word == 'i' || word == 'o' || word == 'u'){
+c = c+1; }
+}
+

week 7/program 5

@@ -0,0 +1,6 @@
+ //Replace the char in string "s1" with the char 'a' at index "n"  and print the modified string 
+ ////ONLY SPECIFIC CODE SNIPPET IS GIVEN BECAUSE I WAS LAZY!!
+StringBuilder string = new StringBuilder(s1);
+string.setCharAt(n,c);
+System.out.print(string);
+}

week 8/program 3

@@ -0,0 +1,19 @@
+import java.util.*;
+public class Pattern3 {
+    public static void main(String[] args) {
+        Scanner inr = new Scanner(System.in);
+	int n = inr.nextInt();
+        // Add the necessary code in the below space
+       for (int i = 0; i < n; i++) {
+            int number = 1;
+            System.out.printf("%" + (n - i) * 2 + "s", "");
+            for (int j = 0; j <= i; j++) {
+                System.out.printf("%4d", number);
+                number = number * (i - j) / (j + 1);
+            }
+            System.out.println();
+        }
+
+    }
+
+}

week5/1

@@ -0,0 +1,22 @@
+import java.util.Scanner;
+interface Number {
+    int findSqr(int i);  // Returns the square of n
+}
+
+//Create a class A which implements the interface Number.
+class A implements Number
+   {
+     public int findSqr(int i) {
+     return i*i;
+      }
+  }
+
+public class Question5_1{ 
+        public static void main (String[] args){ 
+	      A a = new A();   //Create an object of class A
+           // Read a number from the keyboard
+           Scanner sc = new Scanner(System.in);  
+           int i = sc.nextInt();
+           System.out.print(a.findSqr(i)); 
+    } 
+}

week5/2

@@ -0,0 +1,31 @@
+import java.util.Scanner;
+
+interface GCD {
+    public int findGCD(int n1,int n2);
+}
+
+//Create a class B, which implements the interface GCD.
+class B implements GCD
+{
+public int findGCD(int n1,int n2)
+ {
+
+ if(n2 == 0)
+ {
+ return n1;
+ }
+ return findGCD(n2,n2%n1);
+
+ }
+}
+
+public class Question5_2{ 
+        public static void main (String[] args){ 
+	      B a = new B();   //Create an object of class B
+            // Read two numbers from the keyboard
+            Scanner sc = new Scanner(System.in);  
+             int p1 = sc.nextInt();
+             int p2 = sc.nextInt();
+            System.out.print(a.findGCD(p1,p2)); 
+    } 
+}

week5/3

@@ -0,0 +1,20 @@
+import java.util.Scanner;
+
+  public class Question5_3 {
+  public static void main(String[] args) { 
+      int a, b;
+      Scanner input = new Scanner(System.in);
+
+
+//Read any two values for a and b.
+    a = input.nextInt();
+    b = input.nextInt();
+    //Get the result of a/b;
+    try{
+        System.out.print(a/b);
+       }catch(ArithmeticException e){
+          System.out.print("Exception caught: Division by zero.");
+        }
+
+    }
+}

week5/4

@@ -0,0 +1,31 @@
+//Prefixed Fixed Code:
+import java.util.*;
+public class Question5_4{
+  public static void main(String[] args) {
+      Scanner sc = new Scanner(System.in); 
+      int length = sc.nextInt(); 
+      // create an array to save user input 
+      int[] name = new int[length];
+      int sum=0;//save the total sum of the array.
+
+//Define try-catch block to save user input in the array "name",if there is an exception then catch the exception otherwise print the total sum of the array.    
+      for(int i=0 ; i<length ; i++)
+        {
+          try{
+             name[i] = sc.nextInt();
+             sum += name[i];
+          }catch(InputMismatchException e){
+              sum = -1;
+          }
+      }
+          if(sum == -1)
+              {
+                   System.out.print("You entered bad data.");
+              }
+          else
+              {
+                  System.out.print(sum);
+              }
+
+  }
+}

week5/5

@@ -0,0 +1,31 @@
+import java.util.Scanner;
+public class Question5_5{
+	public static void main (String   args[ ] ) {
+           Scanner scan = new Scanner(System.in);
+            int i = scan.nextInt();
+	    int j; 
+
+      // Put the following code under try-catch block to handle exceptions
+    try{
+		switch (i) {
+	    case 0 : 
+		int zero = 0; 
+		j = 92/ zero; 		
+		break;
+            case 1 : 
+		int b[ ] = null; 
+		j = b[0] ; 	
+		break;
+      	    default:
+	       System.out.println("No exception");
+	    }
+	  } 
+     catch(Exception e)
+		{
+			System.out.print(e);
+		}
+
+
+  }
+ }
+

week6/file 1

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+//Complete the code segment to print the following using the concept of extending the Thread class in Java:
+
+-----------------OUTPUT-------------------
+
+Thread is Running.
+
+-------------------------------------------------
+
+ // Write the appropriate code to extend the Thread class to complete the class Question61.
+public class Question61 extends Thread{
+  public void run(){
+  System.out.print("Thread is Running.");  
+  }
+
+  	public static void main(String args[]){  
+
+		// Creating object of thread class
+		Question61 thread=new Question61();  
+
+                // Start the thread
+		thread.start();
+	}  
+}

week6/file-2

@@ -0,0 +1,15 @@
+class ThreadRun implements Runnable {
+        public void run(){ 
+            System.out.print("Thread using Runnable interface."); 
+        } 
+   }
+
+   // Create main class Question62 with main() method and appropriate statements in it
+public class Question62{
+public static void main(String[] args){
+  ThreadRun obj = new ThreadRun();
+  Thread obj2 = new Thread(obj);
+  obj2.start();
+
+}
+}