From 99d6e1adc1a4b96b132c1f3a1a957efb9b517470 Mon Sep 17 00:00:00 2001
From: mepox <21198248+mepox@users.noreply.github.com>
Date: Sat, 8 Oct 2022 13:52:36 +0100
Subject: [PATCH] Added DuplicateChars Java program and updated the README file
 (#28)

* add: DuplicateChars Java program and updated the README file

* refactor: the code to look nicer and to use static inputs

Co-authored-by: Aarav Arora <aaravarora.works@gmail.com>
---
 Java/DuplicateChars.java | 33 +++++++++++++++++++++++++++++++++
 README.md                |  3 ++-
 2 files changed, 35 insertions(+), 1 deletion(-)
 create mode 100644 Java/DuplicateChars.java

diff --git a/Java/DuplicateChars.java b/Java/DuplicateChars.java
new file mode 100644
index 0000000..a20b9d5
--- /dev/null
+++ b/Java/DuplicateChars.java
@@ -0,0 +1,33 @@
+// Check if the given String has duplicate characters, ignoring case.
+public class DuplicateChars {
+	
+	public static void main(String[] args) {		
+		String str1 = "duplicate";
+		String str2 = "character";
+		
+		System.out.println("'" + str1 + "' contains duplicate characters? " + checkDuplicateChars(str1));
+		System.out.println("'" + str2 + "' contains duplicate characters? " + checkDuplicateChars(str2));
+	}
+	
+	static boolean checkDuplicateChars(String str) {
+		// Trim leading and trailing spaces
+		str = str.trim();
+		
+		// Convert all the characters in the String to lower case
+		str = str.toLowerCase();		
+		
+		// Convert the given string to a char array
+		char[] chars = str.toCharArray();
+		
+		// Check each characters present in the string
+		for (int i = 0; i < chars.length; i++) {			
+			for (int j = i + 1; j < chars.length; j++) {
+				if (chars[i] == chars[j]) {					
+					return true; // Found a duplicate character
+				}
+			}			
+		}
+			
+		return false; // No duplicate character found		
+	}
+}
\ No newline at end of file
diff --git a/README.md b/README.md
index bf5e805..135e5a9 100644
--- a/README.md
+++ b/README.md
@@ -41,7 +41,8 @@ Language
 ├─ linkedlist.
 ├─ selectionsort.
 ├─ mergesort.
-└─ armstrong_no.
+├─ Armstrong_no.
+└─ duplicatechars.
 
 
 ```