diff --git a/Android java/SoftGen/bin/Abstraction/AbstractAnimal.class b/Android java/SoftGen/bin/Abstraction/AbstractAnimal.class
index c2d2e86..ef0c16c 100644
Binary files a/Android java/SoftGen/bin/Abstraction/AbstractAnimal.class and b/Android java/SoftGen/bin/Abstraction/AbstractAnimal.class differ
diff --git a/TecmaxPractise/src/com/tecmax/methodExamples/arraylist.java b/TecmaxPractise/src/com/tecmax/methodExamples/hello.java
similarity index 60%
rename from TecmaxPractise/src/com/tecmax/methodExamples/arraylist.java
rename to TecmaxPractise/src/com/tecmax/methodExamples/hello.java
index 0b0acd7..8817eee 100644
--- a/TecmaxPractise/src/com/tecmax/methodExamples/arraylist.java
+++ b/TecmaxPractise/src/com/tecmax/methodExamples/hello.java
@@ -1,5 +1,5 @@
 package com.tecmax.methodExamples;
 
-public class arraylist {
+public class hello {
 
 }
diff --git a/TecmaxPractise/src/com/tecmax/methodExamples/swapingsring.java b/TecmaxPractise/src/com/tecmax/methodExamples/swapingsring.java
deleted file mode 100644
index 1f6644a..0000000
--- a/TecmaxPractise/src/com/tecmax/methodExamples/swapingsring.java
+++ /dev/null
@@ -1,6 +0,0 @@
-package com.tecmax.methodExamples;
-
-public class swapingsring {
-	pub
-
-}
diff --git a/TecmaxPractise/src/com/tecmax/methodExamples/swapstr.java b/TecmaxPractise/src/com/tecmax/methodExamples/swapstr.java
deleted file mode 100644
index f769787..0000000
--- a/TecmaxPractise/src/com/tecmax/methodExamples/swapstr.java
+++ /dev/null
@@ -1,19 +0,0 @@
-package com.tecmax.methodExamples;
-
-public class swapstr {
-
-	public static void main(String[] args) {
-		// TODO Auto-generated method stub
-		String a="java";
-		String b="programming";
-		
-	    a.concat(b);
-	    b=a.substring(0, (a.length()-b.length()));
-	    a=a.substring(b.length());
-	    System.out.println("value of a: "+a);
-	    System.out.println("value of b: "+b);
-
-
-	}
-
-}
diff --git a/TecmaxPractise/src/com/tecmax/methodExamples/swapstring.java b/TecmaxPractise/src/com/tecmax/methodExamples/swapstring.java
deleted file mode 100644
index 0a7b029..0000000
--- a/TecmaxPractise/src/com/tecmax/methodExamples/swapstring.java
+++ /dev/null
@@ -1,5 +0,0 @@
-package com.tecmax.methodExamples;
-
-public class swapstring {
-
-}
diff --git a/TecmaxPractise/src/com/tecmax/methodExamples/thread2.java b/TecmaxPractise/src/com/tecmax/methodExamples/thread2.java
new file mode 100644
index 0000000..b007b81
--- /dev/null
+++ b/TecmaxPractise/src/com/tecmax/methodExamples/thread2.java
@@ -0,0 +1,35 @@
+package com.tecmax.methodExamples;
+
+public class thread2 extends Thread {
+
+ public void run()
+ {
+     try
+     {
+         
+         System.out.println ("Thread " +
+               Thread.currentThread().getId() +
+               " is running");
+
+     }
+     catch (Exception e)
+     {
+         
+         System.out.println ("Exception is caught");
+     }
+ }
+}
+
+
+public class thread3
+{
+ public static void main(String[] args)
+ {
+     int n =8;
+     for (int i=0; i<8; i++)
+     {
+         thread2 object = new thread2();
+         object.start();
+     }
+ }
+}