diff --git a/App.java b/App.java
new file mode 100644
index 0000000..0a839f9
--- /dev/null
+++ b/App.java
@@ -0,0 +1,5 @@
+public class App {
+    public static void main(String[] args) throws Exception {
+        System.out.println("Hello, World!");
+    }
+}
diff --git a/Beginning.java b/Beginning.java
new file mode 100644
index 0000000..d6f9465
--- /dev/null
+++ b/Beginning.java
@@ -0,0 +1,5 @@
+public class Beginning{
+    public static void main(String[] args){
+         System.out.println("Iam Sabbir Hasanat"); 
+    }
+}
\ No newline at end of file
diff --git a/VS Code/App.class b/VS Code/App.class
new file mode 100644
index 0000000..58ec3ed
Binary files /dev/null and b/VS Code/App.class differ
diff --git a/VS Code/Beginning.class b/VS Code/Beginning.class
new file mode 100644
index 0000000..02f766b
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diff --git a/VS Code/bin b/VS Code/bin
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/VS Code/bin	
@@ -0,0 +1 @@
+
diff --git a/VS Code/point.class b/VS Code/point.class
new file mode 100644
index 0000000..b180986
Binary files /dev/null and b/VS Code/point.class differ
diff --git a/VS Code/v21__Constants.class b/VS Code/v21__Constants.class
new file mode 100644
index 0000000..7c0e657
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diff --git a/VS Code/v26__Integer_Data_Types.class b/VS Code/v26__Integer_Data_Types.class
new file mode 100644
index 0000000..9a79db6
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diff --git a/VS Code/v27__Get_Integer_Values.class b/VS Code/v27__Get_Integer_Values.class
new file mode 100644
index 0000000..2fbd6b5
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diff --git a/VS Code/v28__double_data_type.class b/VS Code/v28__double_data_type.class
new file mode 100644
index 0000000..78a4cf7
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diff --git a/VS Code/v29__char_data_type.class b/VS Code/v29__char_data_type.class
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index 0000000..243038a
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diff --git a/VS Code/v30_1.class b/VS Code/v30_1.class
new file mode 100644
index 0000000..438dc8a
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diff --git a/VS Code/v30__boolean_data_type.class b/VS Code/v30__boolean_data_type.class
new file mode 100644
index 0000000..a901134
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diff --git a/VS Code/v31__string_data_type__string_start.class b/VS Code/v31__string_data_type__string_start.class
new file mode 100644
index 0000000..b224961
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diff --git a/VS Code/v32.class b/VS Code/v32.class
new file mode 100644
index 0000000..98cd895
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diff --git a/VS Code/v33__concatenation.class b/VS Code/v33__concatenation.class
new file mode 100644
index 0000000..f67ad75
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diff --git a/VS Code/v35__string_object_create.class b/VS Code/v35__string_object_create.class
new file mode 100644
index 0000000..b33f0c8
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diff --git a/VS Code/v38__taking_input.class b/VS Code/v38__taking_input.class
new file mode 100644
index 0000000..8ab22e6
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diff --git a/VS Code/v51.class b/VS Code/v51.class
new file mode 100644
index 0000000..7c63959
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diff --git a/VS Code/v55.class b/VS Code/v55.class
new file mode 100644
index 0000000..b2a85d3
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diff --git a/VS Code/v58.class b/VS Code/v58.class
new file mode 100644
index 0000000..697ce4d
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diff --git a/VS Code/v60__Loop_start.class b/VS Code/v60__Loop_start.class
new file mode 100644
index 0000000..e5ab811
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diff --git a/VS Code/v61.class b/VS Code/v61.class
new file mode 100644
index 0000000..984972b
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diff --git a/VS Code/v67.class b/VS Code/v67.class
new file mode 100644
index 0000000..4341c6e
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diff --git a/VS Code/v68.class b/VS Code/v68.class
new file mode 100644
index 0000000..c05975e
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diff --git a/VS Code/v68_1.class b/VS Code/v68_1.class
new file mode 100644
index 0000000..4e7daed
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diff --git a/VS Code/v68_1__prime_numbers.class b/VS Code/v68_1__prime_numbers.class
new file mode 100644
index 0000000..e326455
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diff --git a/VS Code/v69__Loop_finished.class b/VS Code/v69__Loop_finished.class
new file mode 100644
index 0000000..b07e1a0
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diff --git a/VS Code/v82.class b/VS Code/v82.class
new file mode 100644
index 0000000..fd62be3
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diff --git a/VS Code/v84.class b/VS Code/v84.class
new file mode 100644
index 0000000..034e34a
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diff --git a/VS Code/v85.class b/VS Code/v85.class
new file mode 100644
index 0000000..c7b8043
Binary files /dev/null and b/VS Code/v85.class differ
diff --git a/VS Code/v86___array_start.class b/VS Code/v86___array_start.class
new file mode 100644
index 0000000..f3a8fd3
Binary files /dev/null and b/VS Code/v86___array_start.class differ
diff --git a/VS Code/v87.class b/VS Code/v87.class
new file mode 100644
index 0000000..5fed863
Binary files /dev/null and b/VS Code/v87.class differ
diff --git a/VS Code/v87_1.class b/VS Code/v87_1.class
new file mode 100644
index 0000000..eb5d02d
Binary files /dev/null and b/VS Code/v87_1.class differ
diff --git a/VS Code/v94.class b/VS Code/v94.class
new file mode 100644
index 0000000..6c991a4
Binary files /dev/null and b/VS Code/v94.class differ
diff --git a/point.java b/point.java
new file mode 100644
index 0000000..dcce9b2
--- /dev/null
+++ b/point.java
@@ -0,0 +1,7 @@
+
+public class point {
+
+    public int x;
+    public int y;
+
+}
diff --git a/v21__Constants.java b/v21__Constants.java
new file mode 100644
index 0000000..6b0d94a
--- /dev/null
+++ b/v21__Constants.java
@@ -0,0 +1,8 @@
+public class v21__Constants {
+    public static void main(String[] args) {
+        final String My_Name;
+        My_Name = "Sabbir Hasanat";
+        System.out.println(My_Name);
+
+    }
+}
diff --git a/v26__Integer_Data_Types.java b/v26__Integer_Data_Types.java
new file mode 100644
index 0000000..cfc4464
--- /dev/null
+++ b/v26__Integer_Data_Types.java
@@ -0,0 +1,26 @@
+public class v26__Integer_Data_Types {
+    public static void main(String[] args) {
+
+        byte b1 = -128;  // -128, 127
+        short s1 = 20;
+        int i1 = 100;
+        long l1 = 999L;
+
+        System.out.println("\n"+b1);
+        System.out.println(s1);
+        System.out.println(i1);
+        System.out.println(l1);
+
+        System.out.println();
+
+        System.out.println(b1-i1);
+        System.out.println(s1-b1);
+        System.out.println(i1-l1);
+
+        System.out.println();
+
+        l1 = i1;
+        System.out.println(i1);
+        System.out.println(l1);
+    }
+}
diff --git a/v27__Get_Integer_Values.java b/v27__Get_Integer_Values.java
new file mode 100644
index 0000000..8a95002
--- /dev/null
+++ b/v27__Get_Integer_Values.java
@@ -0,0 +1,9 @@
+public class v27__Get_Integer_Values {
+    public static void main(String[] args) {
+
+        System.out.println(Integer.MAX_VALUE);
+        System.out.println(Short.MIN_VALUE);
+        System.out.println(Byte.MAX_VALUE);
+        System.out.println(Long.MAX_VALUE);
+    }
+}
diff --git a/v28__double_data_type.java b/v28__double_data_type.java
new file mode 100644
index 0000000..6c7bf3d
--- /dev/null
+++ b/v28__double_data_type.java
@@ -0,0 +1,7 @@
+public class v28__double_data_type {
+    public static void main(String[] args) {
+
+        double d = 10;
+        System.out.println( d - 2.1 );
+    }
+}
diff --git a/v29__char_data_type.java b/v29__char_data_type.java
new file mode 100644
index 0000000..6cb70ab
--- /dev/null
+++ b/v29__char_data_type.java
@@ -0,0 +1,19 @@
+public class v29__char_data_type {
+    public static void main(String[] args) {
+        char c1 = 'A';
+        char c2 = 65;
+        char c3 = '\u0041';
+
+        System.out.println(c1);
+        System.out.println(c2);
+        System.out.println(c3);
+
+        System.out.println();
+
+        int code1 = 'A';
+        int code2 = '\u0041';
+        System.out.println(code1);
+        System.out.println(code2);
+
+    }
+}
diff --git a/v30_1.java b/v30_1.java
new file mode 100644
index 0000000..53ecbea
--- /dev/null
+++ b/v30_1.java
@@ -0,0 +1,8 @@
+public class v30_1 {
+    public static void main(String[] args) {
+        boolean isAlive = true;
+
+        if(isAlive) System.out.println("alive");
+        else System.out.println("not alive");
+    }
+}
diff --git a/v30__boolean_data_type.java b/v30__boolean_data_type.java
new file mode 100644
index 0000000..8c1cc7a
--- /dev/null
+++ b/v30__boolean_data_type.java
@@ -0,0 +1,14 @@
+public class v30__boolean_data_type {
+    public static void main(String[] args) {
+        boolean b1 = true;
+        boolean b2 = false;
+        boolean b3 = 2 < 3;
+        boolean b4 = 2 > 3;
+
+        System.out.println(b1);
+        System.out.println(b2);
+        System.out.println(b3);
+        System.out.println(b4);
+
+    }
+}
diff --git a/v31__string_data_type__string_start.java b/v31__string_data_type__string_start.java
new file mode 100644
index 0000000..5a1bd0c
--- /dev/null
+++ b/v31__string_data_type__string_start.java
@@ -0,0 +1,13 @@
+public class v31__string_data_type__string_start {
+    public static void main(String[] args) {
+
+        String name = "Sabbir Hasanat";
+        
+        String u = name.toUpperCase();
+        System.out.println(u);
+
+        String l = name.toLowerCase();
+        System.out.println(l);
+
+    }
+}
diff --git a/v32.java b/v32.java
new file mode 100644
index 0000000..c43145d
--- /dev/null
+++ b/v32.java
@@ -0,0 +1,26 @@
+public class v32 {
+    public static void main(String[] args) {
+
+        String s1 = "Sabbir Hasanat";
+        System.out.println(s1.toUpperCase());
+
+        String s2 = s1.toLowerCase();
+        System.out.println(s2);
+
+        System.out.println(s1);
+
+        System.out.println(s1.isBlank());
+        // System.out.println(s1.isEmpty());
+
+        char c = s1.charAt(4);  //start from [0]
+        System.out.println(c);
+
+        int i = s1.indexOf('r');   //start from [0]
+        System.out.println(i);
+
+        String s3 = s1.concat(" Shimul");
+        System.out.println(s3);
+
+        
+    }
+}
diff --git a/v33__concatenation.java b/v33__concatenation.java
new file mode 100644
index 0000000..9a2a928
--- /dev/null
+++ b/v33__concatenation.java
@@ -0,0 +1,14 @@
+public class v33__concatenation {
+    public static void main(String[] args) {
+        String s1 = "Sabbir";
+        String s2 = "Hasanat";
+        String full = s1+ " "+s2;
+
+        System.out.println(full);
+
+        System.out.println("My id is " + 2 + 5);
+        System.out.println("My id is " + (2 + 5));
+
+        System.out.println("Sabbir".concat(" Hasanat").concat(" - 1007"));
+    }
+}
diff --git a/v35__string_object_create.java b/v35__string_object_create.java
new file mode 100644
index 0000000..8829ffb
--- /dev/null
+++ b/v35__string_object_create.java
@@ -0,0 +1,8 @@
+public class v35__string_object_create {
+    public static void main(String[] args) {
+
+        // Classname objectname = new Classname(parameters)
+
+        
+    }
+}
diff --git a/v38__taking_input.java b/v38__taking_input.java
new file mode 100644
index 0000000..57d5479
--- /dev/null
+++ b/v38__taking_input.java
@@ -0,0 +1,20 @@
+import java.util.*;
+
+public class v38__taking_input {
+    public static void main(String[] args) {
+        
+        Scanner sc = new Scanner(System.in);
+
+        // System.out.print("Enter a number: ");
+        // System.out.println(sc.nextInt()+"\n"+"Enter again a number: ");
+
+        // float f = sc.nextFloat();
+        // System.out.println(f);
+
+        System.out.print("String: ");
+        String s = sc.nextLine();
+        System.out.println(s);
+
+
+    }
+}
diff --git a/v51.java b/v51.java
new file mode 100644
index 0000000..2cf31da
--- /dev/null
+++ b/v51.java
@@ -0,0 +1,13 @@
+import java.util.*;
+
+public class v51 {
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        System.out.print("Enter an integer: ");
+        int n = sc.nextInt();
+
+        if(n%2==0) System.out.println(n+" is even");
+        else System.out.println(n+" is odd");
+    }
+    
+}
diff --git a/v55.java b/v55.java
new file mode 100644
index 0000000..ff4c83c
--- /dev/null
+++ b/v55.java
@@ -0,0 +1,18 @@
+public class v55 {
+    public static void main(String[] args) {
+        
+        int n=10;
+        switch (n) {
+            case 10:
+            System.out.println("= 10");                
+            break;
+
+            case 90: 
+            System.out.println("= 90");
+            break;
+        
+            default:
+                System.out.println("non of the above");
+        }
+    }
+}
diff --git a/v58.java b/v58.java
new file mode 100644
index 0000000..b5a0ada
--- /dev/null
+++ b/v58.java
@@ -0,0 +1,26 @@
+import java.util.Scanner;
+
+public class v58 {
+    public static void main(String[] args) {
+        Scanner s= new Scanner(System.in);
+
+        System.out.print("Enter a four digit number: ");
+        int n = s.nextInt();
+
+        if(!(n>999) ) 
+            System.out.println("not four digit number");
+        
+        else {
+        int n1 = n % 10;
+        int n2 = (n / 10) % 10;
+        int n3 = (n / 100) % 10;
+        int n4 = (n / 1000) % 10;
+
+        if( n1+n2 == n3+n4 ) System.out.println("lucky");
+        else System.out.println("not lucky");
+        }
+
+        
+
+    }
+}
diff --git a/v60__Loop_start.java b/v60__Loop_start.java
new file mode 100644
index 0000000..34f60c2
--- /dev/null
+++ b/v60__Loop_start.java
@@ -0,0 +1,18 @@
+import java.util.Scanner;
+
+public class v60__Loop_start {
+    public static void main(String[] args) {
+        
+        Scanner s = new Scanner(System.in);
+        
+        System.out.print("Enter a number between 1 to 10 : ");
+        int n = s.nextInt();
+
+        while(n<1 || n>10){
+            System.out.print(n+" is not between 1 to 10. Try again: ");
+            n = s.nextInt();
+        }
+
+        System.out.println(n+ " is between 1 to 10. Thanks!");
+    }
+}
diff --git a/v61.java b/v61.java
new file mode 100644
index 0000000..3fb6d79
--- /dev/null
+++ b/v61.java
@@ -0,0 +1,16 @@
+import java.util.Scanner;
+
+public class v61 {
+    public static void main(String[] args) {
+        
+        Scanner s = new Scanner(System.in);
+
+        int n;
+        do {
+            System.out.print("Enter a number between 1 to 10: ");
+            n = s.nextInt();
+        } while(n<1 || n>10);
+
+        System.out.println(n+" is between 1 to 10.");
+    }
+}
diff --git a/v67.java b/v67.java
new file mode 100644
index 0000000..96c804b
--- /dev/null
+++ b/v67.java
@@ -0,0 +1,18 @@
+import java.util.Scanner;
+
+public class v67 {
+    public static void main(String[] args) {
+
+        Scanner s = new Scanner(System.in);
+
+        System.out.print("Enter a number: ");
+        int n = s.nextInt();
+
+        int i, sum = 0;
+        for (i = 1; i <= n / 2; i++) {
+            if (n % i == 0)
+                sum += i;
+        }
+        System.out.println("sum = " + sum);
+    }
+}
diff --git a/v68.java b/v68.java
new file mode 100644
index 0000000..437f7bc
--- /dev/null
+++ b/v68.java
@@ -0,0 +1,18 @@
+import java.util.Scanner;
+
+public class v68 {
+    public static void main(String[] args) {
+
+        Scanner s = new Scanner(System.in);
+
+        System.out.print("Enter a number: ");
+        int n = s.nextInt();
+
+        int i, sum = 0;
+        for (i = 2; i <= n / 2; i++) {
+            if (n % i == 0)
+                sum += i;
+        }
+        System.out.println(sum == 1 ? "prime" : "not prime");
+    }
+}
diff --git a/v68_1.java b/v68_1.java
new file mode 100644
index 0000000..f44dc5b
--- /dev/null
+++ b/v68_1.java
@@ -0,0 +1,22 @@
+import java.util.Scanner;
+
+public class v68_1 {
+    public static void main(String[] args) {
+
+        Scanner s = new Scanner(System.in);
+
+        System.out.print("Enter a number: ");
+        int n = s.nextInt();
+
+        int i;
+
+        boolean isPrime = true;
+        for (i = 2; i <= n / 2; i++) {
+            if (n % i == 0){
+                isPrime = false;
+                break;
+            }
+            System.out.println(isPrime? "prime" : "not prime");
+        }
+    }
+}
diff --git a/v68_1__prime_numbers.java b/v68_1__prime_numbers.java
new file mode 100644
index 0000000..67ef905
--- /dev/null
+++ b/v68_1__prime_numbers.java
@@ -0,0 +1,24 @@
+import java.util.Scanner;
+
+public class v68_1__prime_numbers {
+    public static void main(String[] args) {
+
+        Scanner s = new Scanner(System.in);
+
+        System.out.print("Enter n: ");
+        int n = s.nextInt();
+
+        int i,count=0;
+        for(i=2;i<=n;i++){
+            if(n%i==0){
+                count++;
+            }
+        }
+        
+        if(count==1){
+            System.out.print("prime\n");
+        }
+        else System.out.println("not prime");
+
+    }
+}
diff --git a/v69__Loop_finished.java b/v69__Loop_finished.java
new file mode 100644
index 0000000..6c80c83
--- /dev/null
+++ b/v69__Loop_finished.java
@@ -0,0 +1,28 @@
+import java.util.Scanner;
+
+public class v69__Loop_finished {
+    public static void main(String[] args) {
+        
+        Scanner s= new Scanner(System.in);
+
+        System.out.print("Enter a number: ");
+        int n = s.nextInt();
+
+        int max = n;
+        int min = n;
+
+        while(true){
+            n = s.nextInt();
+
+            if(n<0)
+            break;
+
+            if(n>max)
+            max = n;
+
+            if(n<min)
+            min = n; 
+        }
+        System.out.println("min= "+min+", max= "+max);
+    }
+}
diff --git a/v82.java b/v82.java
new file mode 100644
index 0000000..9d919c5
--- /dev/null
+++ b/v82.java
@@ -0,0 +1,12 @@
+public class v82 {
+    public static void main(String[] args) {
+        
+        point p1 = new point();
+
+        p1.x = 1;  
+        p1.y = 2;
+
+        System.out.println("x = "+p1.x+", y = "+p1.y);
+
+    }
+}
diff --git a/v84.java b/v84.java
new file mode 100644
index 0000000..829a367
--- /dev/null
+++ b/v84.java
@@ -0,0 +1,16 @@
+import java.util.Scanner;
+
+public class v84 {
+    public static void main(String[] args) {
+        System.out.print("Enter your name & age: ");
+        System.out.println("Name: "+getName()+"\nAge: "+getAge());
+
+    }
+    public static String getName(){
+        return new Scanner(System.in).nextLine();
+    }
+
+    public static double getAge(){
+        return new Scanner(System.in).nextDouble();
+    }
+}
diff --git a/v85.java b/v85.java
new file mode 100644
index 0000000..895ebf3
--- /dev/null
+++ b/v85.java
@@ -0,0 +1,23 @@
+import java.util.Scanner;
+
+public class v85 {
+    public static void main(String[] args) {
+
+        Scanner s = new Scanner(System.in);
+
+        // System.out.print("Start from: ");
+        // int n1 = s.nextInt();
+
+        System.out.print("End to: ");
+        int n2 = s.nextInt();
+
+        int count = 0;
+        for(int i = 2; i<=n2/2; i++){
+            if (n2%i==0)
+            count++;
+
+            if(count==1)
+            System.out.print(" ");
+        }
+    }
+}
diff --git a/v86___array_start.java b/v86___array_start.java
new file mode 100644
index 0000000..a923639
--- /dev/null
+++ b/v86___array_start.java
@@ -0,0 +1,28 @@
+import java.util.Scanner;
+
+public class v86___array_start {
+    public static void main(String[] args) {
+
+        //for al input
+        Scanner s = new Scanner(System.in);
+
+        //for a specific array
+        int a[] = new int[100];
+
+        System.out.print("Enter size: ");
+        int n = s.nextInt();
+
+        System.out.println("Enter elements: ");
+        for(int i=0;i<n;i++){
+            a[i] = s.nextInt();
+        }
+
+        System.out.println("Arrays: ");
+        for(int i=0;i<n;i++){
+            System.out.print(a[i]+" ");
+        }
+
+
+
+    }
+}
diff --git a/v87.java b/v87.java
new file mode 100644
index 0000000..3e5193c
--- /dev/null
+++ b/v87.java
@@ -0,0 +1,16 @@
+import java.util.Arrays;
+
+public class v87 {
+    public static void main(String[] args) {
+
+        int[] a = { 5, -2, 23, 7, 87, -42, 509 };
+
+        Arrays.sort(a);
+
+        System.out.print("Sorted array: ");
+        for(int x : a){
+            System.out.print(x+" ");
+        }
+        
+    }
+}
diff --git a/v87_1.java b/v87_1.java
new file mode 100644
index 0000000..18bfd35
--- /dev/null
+++ b/v87_1.java
@@ -0,0 +1,20 @@
+import java.util.Arrays;
+import java.util.Scanner;
+
+public class v87_1 {
+    public static void main(String[] args) {
+        int a[] = {2,1,6,4,9,0,-1};
+
+        Arrays.sort(a);
+
+        System.out.print("Sorted array: ");
+        for(int x:a){
+            System.out.print(x+" ");
+        }
+
+        System.out.print("\nEnter searching element: ");
+        System.out.print("Found at index: "+Arrays.binarySearch( a , new Scanner(System.in).nextInt() ));
+
+
+    }
+}
diff --git a/v94.java b/v94.java
new file mode 100644
index 0000000..407d935
--- /dev/null
+++ b/v94.java
@@ -0,0 +1,23 @@
+import java.util.Scanner;
+
+public class v94 {
+    public static void main(String[] args) {
+        int a[] = { 1, 1, 1, 2, 2, 3, 3, 3, 4, 5, 5, 5, 5, 5, 5 };
+
+        System.out.print("Enter a element: ");
+        int searchelement = new Scanner(System.in).nextInt();
+
+        System.out.println(getnumberooc(a, searchelement));
+    }
+
+    public static int getnumberooc(int a[], int searchelement) {
+        int ooc = 0;
+        for (int i = 0; i < a.length; i++) {
+            if (searchelement == a[i])
+                ooc++;
+        }
+
+        return ooc;
+    }
+
+}
\ No newline at end of file
