diff --git a/Java/array_binary_int.java b/Java/array_binary_int.java
new file mode 100644
index 0000000..b2b2166
--- /dev/null
+++ b/Java/array_binary_int.java
@@ -0,0 +1,55 @@
+
+import java.util.Scanner;
+public class array_binary_int
+{//ascending
+    int arr[],n,i,ele;
+    void input()
+    {
+        Scanner sc=new Scanner(System.in);
+        System.out.println("enter limit of array");
+        n=sc.nextInt();
+        arr=new int[n];
+        System.out.println("enter "+n+" elements");
+        for(i=0;i<n;i++)
+        {
+            arr[i]=sc.nextInt();
+        }
+        System.out.println("enter element to search");
+        ele=sc.nextInt();
+    }
+    void display()
+    {
+        for(i=0;i<n;i++)
+            System.out.print(arr[i]+" ");
+        System.out.println();
+    }
+    void binary()
+    {
+        boolean flag=false;
+        int first=0,last=n-1,mid=0;
+        while(first<=last)
+        {
+            mid=(first+last)/2;
+            if(arr[mid]<ele)
+                first=mid+1;
+            else if(arr[mid]>ele)
+                last=mid-1;
+            else
+            {
+                flag=true;
+                break;
+            }
+        }
+        if(flag==true)
+            System.out.println("found at index"+(mid+1));
+        else
+            System.out.println("not found");
+    }
+    public static void main(String args[])
+    {
+        array_binary_int obj=new array_binary_int();
+        obj.input();
+        obj.display();
+        obj.binary();
+    }
+}
diff --git a/Java/array_bubble_char.java b/Java/array_bubble_char.java
new file mode 100644
index 0000000..a1bc7eb
--- /dev/null
+++ b/Java/array_bubble_char.java
@@ -0,0 +1,39 @@
+
+import java.util.Scanner;
+public class array_bubble_char 
+{//ascending
+    void bubblesort()
+    {
+        char c[],temp;
+        int i,j,n;
+        Scanner sc=new Scanner(System.in);
+        System.out.println("Enter number of elements");
+        n=sc.nextInt();
+        c=new char[n];
+        System.out.println("Enter "+n+" characters");
+        for(i=0;i<n;i++)
+        {
+            c[i]=sc.next().charAt(0);
+        }
+        for(i=0;i<n;i++)
+        {
+            for(j=0;j<(n-1);j++)
+            {
+                if(c[j]>c[j+1])
+                {
+                temp=c[j];
+                c[j]=c[j+1];
+                c[j+1]=temp;
+                }
+            }
+        }
+        for(i=0;i<n;i++)
+            System.out.print(c[i]+" ");
+    }
+    public static void main(String args[])
+    {
+        array_bubble_char obj=new array_bubble_char();
+        obj.bubblesort();
+    }
+}
+
diff --git a/Java/array_bubble_s.java b/Java/array_bubble_s.java
new file mode 100644
index 0000000..c99c62f
--- /dev/null
+++ b/Java/array_bubble_s.java
@@ -0,0 +1,38 @@
+
+import java.util.Scanner;
+public class array_bubble_s 
+{//ascending
+  void bubblesort()
+    {
+        String c[],temp;
+        int i,j,n;
+        Scanner sc=new Scanner(System.in);
+        System.out.println("Enter number of elements");
+        n=sc.nextInt();
+        c=new String[n];
+        System.out.println("Enter "+n+" words");
+        for(i=0;i<n;i++)
+        {
+            c[i]=sc.next();
+        }
+        for(i=0;i<n;i++)
+        {
+            for(j=0;j<(n-1);j++)
+            {
+                if(c[j].compareTo(c[j+1])>0)
+                {
+                temp=c[j];
+                c[j]=c[j+1];
+                c[j+1]=temp;
+                }
+            }
+        }
+        for(i=0;i<n;i++)
+            System.out.print(c[i]+" ");
+    }
+    public static void main(String args[])
+    {
+        array_bubble_s obj=new array_bubble_s();
+        obj.bubblesort();
+    }
+}
diff --git a/Java/string_palindrome.java b/Java/string_palindrome.java
new file mode 100644
index 0000000..f0b31cf
--- /dev/null
+++ b/Java/string_palindrome.java
@@ -0,0 +1,36 @@
+
+import java.util.Scanner;
+public class string_palindrome
+{//palindrome of a word
+    String str;
+    int len;
+    void input()
+    {
+       Scanner sc= new Scanner(System.in) ;
+       System.out. println("enter a word");
+       str=sc.next();
+       len=str.length();   
+    }
+    void palindrome()
+    {
+        String reverse="";
+        char ch;
+        for(int i=len-1;i>=0;i--)
+        {
+        ch=str.charAt(i);
+        reverse =reverse+ch;
+        }//end of for
+        System.out.println("reversed  "+reverse);
+        if(reverse.equals(str))
+         System.out.println(str+"  is a palindrome string");
+        else
+         System.out.println(str+"   is NOT a palindrome string");
+        
+    }
+    public static void main(String args[]) 
+    {
+        string_palindrome obj = new string_palindrome();
+        obj.input();
+        obj.palindrome();
+    }
+}