From cc83093210d7b3bc948205ed4ed6285bf74929a7 Mon Sep 17 00:00:00 2001
From: Amneesh Singh <natto@weirdnatto.in>
Date: Wed, 7 Jun 2023 03:37:31 +0530
Subject: [PATCH] extras: add P16-P23, P25

Signed-off-by: Amneesh Singh <natto@weirdnatto.in>
---
 P16.java |  5 +++++
 P17.java |  9 +++++++++
 P18.java | 11 +++++++++++
 P19.java | 17 +++++++++++++++++
 P20.java | 14 ++++++++++++++
 P21.java | 23 +++++++++++++++++++++++
 P22.java | 25 +++++++++++++++++++++++++
 P23.java | 24 ++++++++++++++++++++++++
 P25.java | 25 +++++++++++++++++++++++++
 9 files changed, 153 insertions(+)
 create mode 100644 P16.java
 create mode 100644 P17.java
 create mode 100644 P18.java
 create mode 100644 P19.java
 create mode 100644 P20.java
 create mode 100644 P21.java
 create mode 100644 P22.java
 create mode 100644 P23.java
 create mode 100644 P25.java

diff --git a/P16.java b/P16.java
new file mode 100644
index 0000000..c31ee26
--- /dev/null
+++ b/P16.java
@@ -0,0 +1,5 @@
+public class P16 {
+    public static void main(String[] args) {
+        System.out.println("Hello World");
+    }
+}
diff --git a/P17.java b/P17.java
new file mode 100644
index 0000000..7c2fd1d
--- /dev/null
+++ b/P17.java
@@ -0,0 +1,9 @@
+public class P17 {
+    public static void main(String[] args) {
+        int a = 5;
+        int b = 6;
+        int c = a + b;
+
+        System.out.print(c);
+    }
+}
diff --git a/P18.java b/P18.java
new file mode 100644
index 0000000..cda3adf
--- /dev/null
+++ b/P18.java
@@ -0,0 +1,11 @@
+public class P18 {
+  public static void main(String[] _args) {
+      int a = 5, b, f;
+      b = f = a;
+
+      while (b-- > 1)
+          f *= b;
+
+      System.out.println(a + "! = " + f);
+  }
+}
diff --git a/P19.java b/P19.java
new file mode 100644
index 0000000..fd4bc55
--- /dev/null
+++ b/P19.java
@@ -0,0 +1,17 @@
+import java.util.Scanner;
+
+public class P19 {
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+
+        System.out.print("Enter the first number: ");
+        int a = scanner.nextInt();
+
+        System.out.print("Enter the second number: ");
+        int b = scanner.nextInt();
+
+        System.out.println("Sum: " + (a + b));
+
+        scanner.close();
+    }
+}
diff --git a/P20.java b/P20.java
new file mode 100644
index 0000000..217c6a2
--- /dev/null
+++ b/P20.java
@@ -0,0 +1,14 @@
+public class P20 {
+    public static void main(String[] args) {
+        int n = 10;
+        System.out.print("Fibonacci Series of length " + n + ": ");
+        fibonacci(0, 1, n);
+    }
+
+    public static void fibonacci(int a, int b, int n) {
+        if (n == 0)
+            return;
+        System.out.print(a + " ");
+        fibonacci(b, a + b, n - 1);
+    }
+}
diff --git a/P21.java b/P21.java
new file mode 100644
index 0000000..ef412e8
--- /dev/null
+++ b/P21.java
@@ -0,0 +1,23 @@
+import java.util.Scanner;
+
+public class P21 {
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+
+        System.out.print("Enter a: ");
+        int a = scanner.nextInt();
+
+        System.out.print("Enter b: ");
+        int b = scanner.nextInt();
+
+        System.out.print("Enter c: ");
+        int c = scanner.nextInt();
+
+        if ( a > b && a > c)
+            System.out.print("a is the greatest integer");
+        else if ( b > a && b > c)
+            System.out.print("b is the greatest integer");
+        else
+            System.out.print("c is the greatest integer");
+    }
+}
diff --git a/P22.java b/P22.java
new file mode 100644
index 0000000..ca04757
--- /dev/null
+++ b/P22.java
@@ -0,0 +1,25 @@
+import java.util.Scanner;
+
+public class P22 {
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+
+        System.out.print("Enter an integer: ");
+        int n = scanner.nextInt();
+
+        System.out.println(n + " is " + (prime(n) ? "" : "not ") + "a prime number.");
+
+        scanner.close();
+    }
+
+    public static boolean prime(int number) {
+        if (number <= 1)
+            return false;
+
+        for (int i = 2; i <= Math.sqrt(number); i++)
+            if (number % i == 0)
+                return false;
+
+        return true;
+    }
+}
diff --git a/P23.java b/P23.java
new file mode 100644
index 0000000..acce013
--- /dev/null
+++ b/P23.java
@@ -0,0 +1,24 @@
+public class P23 {
+    private String parentVariable = "Parent";
+
+    public void parentMethod() {
+        System.out.println("Parent method");
+        Child child = new Child();
+        child.childMethod();
+    }
+
+    public class Child {
+        private String childVariable = "Child";
+
+        public void childMethod() {
+            System.out.println("Child method");
+            System.out.println("Accessing parent variable: " + parentVariable);
+            System.out.println("Accessing child variable: " + childVariable);
+        }
+    }
+
+    public static void main(String[] args) {
+        P23 parent = new P23();
+        parent.parentMethod();
+    }
+}
diff --git a/P25.java b/P25.java
new file mode 100644
index 0000000..1ae6820
--- /dev/null
+++ b/P25.java
@@ -0,0 +1,25 @@
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+public class P25 {
+    public static void main(String[] args) {
+        List<String> names = new ArrayList<>();
+        
+        names.add("Batu");
+        names.add("Amba");
+        names.add("John");
+        names.add("Quandangle");
+        names.add("Harikrishan");
+        
+        System.out.println("Names before sorting:");
+        for (String name : names)
+            System.out.print(name + " ");
+        
+        Collections.sort(names);
+        
+        System.out.println("\nNames after sorting:");
+        for (String name : names)
+            System.out.print(name + " ");
+    }
+}