diff --git a/.Concat.java.swp b/.Concat.java.swp
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diff --git a/src/Concat/Concat.class b/src/Concat/Concat.class
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diff --git a/src/Concat/Concat.java b/src/Concat/Concat.java
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--- /dev/null
+++ b/src/Concat/Concat.java
@@ -0,0 +1,13 @@
+import java.io.*;
+
+public class Concat{
+	public static void main(String[] args){
+		String str1="AB";
+		String str2="CD";
+		String str3="ef";
+		String str;
+		
+		str= str1.concat(str2).concat(str3.toUpperCase());
+		System.out.println(str);
+	}
+}
diff --git a/PariDispari.class b/src/PariDispari/PariDispari.class
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rename from PariDispari.class
rename to src/PariDispari/PariDispari.class
diff --git a/PariDispari.java b/src/PariDispari/PariDispari.java
similarity index 100%
rename from PariDispari.java
rename to src/PariDispari/PariDispari.java