Added 15 solutions

Java/Introduction/Java Currency Formatter/Solution.java

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+import java.util.Scanner;
+import java.text.NumberFormat;
+import java.util.Locale;
+
+public class Solution {
+    
+    public static void main(String[] args) {
+        /* Read input */
+        Scanner scanner = new Scanner(System.in);
+        double payment = scanner.nextDouble();
+        scanner.close();
+
+        /* Create custom Locale for India. 
+          I used the "IANA Language Subtag Registry" to find India's country code */
+        Locale indiaLocale = new Locale("en", "IN");
+
+        /* Create NumberFormats using Locales */
+        NumberFormat us     = NumberFormat.getCurrencyInstance(Locale.US);
+        NumberFormat india  = NumberFormat.getCurrencyInstance(indiaLocale);
+        NumberFormat china  = NumberFormat.getCurrencyInstance(Locale.CHINA);
+        NumberFormat france = NumberFormat.getCurrencyInstance(Locale.FRANCE);
+
+        /* Print output */        
+        System.out.println("US: "     + us.format(payment));
+        System.out.println("India: "  + india.format(payment));
+        System.out.println("China: "  + china.format(payment));
+        System.out.println("France: " + france.format(payment));
+    }
+}

Java/Introduction/Java Datatypes/Solution.java

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+import java.util.Scanner;
+
+class Solution{
+    public static void main(String []args) {
+
+        Scanner scan = new Scanner(System.in);
+        int t = scan.nextInt();
+
+        for (int i = 0; i < t; i++) {
+            try {
+                long x = scan.nextLong();
+                System.out.println(x + " can be fitted in:");
+                if (x >= Byte.MIN_VALUE && x <= Byte.MAX_VALUE) {
+                    System.out.println("* byte");
+                }
+                if (x >= Short.MIN_VALUE && x <= Short.MAX_VALUE) {
+                    System.out.println("* short");
+                }
+                if (x >= Integer.MIN_VALUE && x <= Integer.MAX_VALUE) {
+                    System.out.println("* int");
+                }
+                if (x >= Long.MIN_VALUE && x <= Long.MAX_VALUE) {
+                    System.out.println("* long");
+                }
+            } catch(Exception e) {
+                System.out.println(scan.next() +" can't be fitted anywhere.");
+            }
+        }
+    }
+}

Java/Introduction/Java Date and Time/Solution.java

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+import java.util.Scanner;
+import java.time.LocalDate;
+
+public class Solution {
+
+    public static void main(String[] args) {
+        /* Read input */
+        Scanner scan = new Scanner(System.in);
+        int month = scan.nextInt();
+        int day   = scan.nextInt();
+        int year  = scan.nextInt();
+        scan.close();
+        
+        /* Create LocalDate instance */
+        LocalDate date = LocalDate.of(year, month, day);
+        System.out.println(date.getDayOfWeek());
+    }
+}

Java/Introduction/Java End-of-file/Solution.java

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+import java.util.Scanner;
+
+public class Solution {
+
+    public static void main(String[] args) {
+        Scanner scan = new Scanner(System.in);
+        int i = 1;
+        while (scan.hasNextLine()) { 
+            System.out.println(i + " " + scan.nextLine());
+            i++;
+        }
+    }
+}

Java/Introduction/Java Int to String/Solution.java

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+import java.util.*;
+import java.security.*;
+public class Solution {
+ public static void main(String[] args) {
+
+  DoNotTerminate.forbidExit();
+
+  try {
+   Scanner in = new Scanner(System.in);
+   int n = in .nextInt();
+   in.close();
+   //String s=???; Complete this line below
+   
+   /* Here are 3 ways to convert an int to a String */
+   // String s = String.valueOf(n);
+   // String s = Integer.toString(n);
+   String s = "" + n;
+
+   if (n == Integer.parseInt(s)) {
+    System.out.println("Good job");
+   } else {
+    System.out.println("Wrong answer.");
+   }
+  } catch (DoNotTerminate.ExitTrappedException e) {
+   System.out.println("Unsuccessful Termination!!");
+  }
+ }
+}
+
+//The following class will prevent you from terminating the code using exit(0)!
+class DoNotTerminate {
+
+ public static class ExitTrappedException extends SecurityException {
+
+  private static final long serialVersionUID = 1;
+ }
+
+ public static void forbidExit() {
+  final SecurityManager securityManager = new SecurityManager() {
+   @Override
+   public void checkPermission(Permission permission) {
+    if (permission.getName().contains("exitVM")) {
+     throw new ExitTrappedException();
+    }
+   }
+  };
+  System.setSecurityManager(securityManager);
+ }
+}

Java/Introduction/Java Loops I/Solution.java

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+import java.util.Scanner;
+
+public class Solution {
+
+    public static void main(String[] args) {
+        Scanner scan = new Scanner(System.in);
+        int multiplier = scan.nextInt();
+        for (int i = 1; i <= 10; i++) {
+            System.out.format("%d x %d = %d%n", multiplier, i , i * multiplier);
+        }
+    }
+}

Java/Introduction/Java Loops II/Solution.java

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+import java.util.Scanner;
+
+class Solution{
+    public static void main(String []args) {
+        Scanner scan = new Scanner(System.in);
+        int t = scan.nextInt();
+        for (int i = 0; i < t; i++) {
+            int a = scan.nextInt();
+            int b = scan.nextInt();
+            int n = scan.nextInt();
+            
+            for (int j = 0; j < n; j++) {
+                a += b * (int) Math.pow(2, j);
+                System.out.print(a + " ");
+            }
+            System.out.println();
+        }
+        scan.close();
+    }
+}

Java/Introduction/Java Output Formatting/Solution.java

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+import java.util.Scanner;
+
+public class Solution {
+
+    public static void main(String[] args) {
+            Scanner sc = new Scanner(System.in);
+            System.out.println("================================");
+            for (int i = 0; i < 3; i++) {
+                String s1 = sc.next();
+                int x = sc.nextInt();
+                System.out.format("%-15s%03d%n", s1, x);
+            }
+            System.out.println("================================");
+    }
+}

Java/Introduction/Java Static Initializer Block/Solution.java

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+import java.io.*;
+import java.util.*;
+import java.text.*;
+import java.math.*;
+import java.util.regex.*;
+
+public class Solution {
+    private static int B;
+    private static int H;
+    private static boolean flag;
+
+    static {
+        Scanner scan = new Scanner(System.in);
+        B = scan.nextInt();
+        H = scan.nextInt();
+        scan.close();
+        if (B <= 0 || H <= 0) {
+            System.out.println("java.lang.Exception: Breadth and height must be positive");
+            flag = false;
+        } else {
+            flag = true;
+        }
+    }
+
+    public static void main(String[] args){
+        if(flag){
+            int area=B*H;
+            System.out.print(area);
+        }
+        
+    }//end of main
+
+}//end of class