diff --git a/.vscode/launch.json b/.vscode/launch.json
new file mode 100644
index 0000000..865ee77
--- /dev/null
+++ b/.vscode/launch.json
@@ -0,0 +1,105 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "type": "java",
+            "name": "Launch Random_Number",
+            "request": "launch",
+            "mainClass": "Random_Number",
+            "projectName": "Simple-Java-Projects_3ac92137"
+        },
+        {
+            "type": "java",
+            "name": "Launch Time_Difference_calc",
+            "request": "launch",
+            "mainClass": "Time_Difference_calc",
+            "projectName": "Simple-Java-Projects_3ac92137"
+        },
+        {
+            "type": "java",
+            "name": "Launch Time_Difference",
+            "request": "launch",
+            "mainClass": "Time_Difference",
+            "projectName": "Simple-Java-Projects_3ac92137"
+        },
+        {
+            "type": "java",
+            "name": "Launch Rectangle_perimeter",
+            "request": "launch",
+            "mainClass": "Rectangle_perimeter",
+            "projectName": "Simple-Java-Projects_3ac92137"
+        },
+        {
+            "type": "java",
+            "name": "Launch Square_Area",
+            "request": "launch",
+            "mainClass": "Square_Area",
+            "projectName": "Simple-Java-Projects_3ac92137"
+        },
+        {
+            "type": "java",
+            "name": "Launch Square_perimeter",
+            "request": "launch",
+            "mainClass": "Square_perimeter",
+            "projectName": "Simple-Java-Projects_3ac92137"
+        },
+        {
+            "type": "java",
+            "name": "Launch Sorter",
+            "request": "launch",
+            "mainClass": "Sorter",
+            "projectName": "Simple-Java-Projects_3ac92137"
+        },
+        {
+            "type": "java",
+            "name": "Launch HelloWorld",
+            "request": "launch",
+            "mainClass": "HelloWorld",
+            "projectName": "Simple-Java-Projects_3ac92137"
+        },
+        {
+            "type": "java",
+            "name": "Launch Circumference",
+            "request": "launch",
+            "mainClass": "Circumference",
+            "projectName": "Simple-Java-Projects_3ac92137"
+        },
+        {
+            "type": "java",
+            "name": "Launch CircleArea",
+            "request": "launch",
+            "mainClass": "CircleArea",
+            "projectName": "Simple-Java-Projects_3ac92137"
+        },
+        {
+            "type": "java",
+            "name": "Launch Multiplication",
+            "request": "launch",
+            "mainClass": "Multiplication",
+            "projectName": "Simple-Java-Projects_3ac92137"
+        },
+        {
+            "type": "java",
+            "name": "Launch Sum",
+            "request": "launch",
+            "mainClass": "Sum",
+            "projectName": "Simple-Java-Projects_3ac92137"
+        },
+        {
+            "type": "java",
+            "name": "Launch Difference",
+            "request": "launch",
+            "mainClass": "Difference",
+            "projectName": "Simple-Java-Projects_3ac92137"
+        },
+        {
+            "type": "java",
+            "name": "Launch Current File",
+            "request": "launch",
+            "mainClass": "${file}"
+        }
+    ]
+}
\ No newline at end of file
diff --git a/Java-calculator/Difference.java b/Java-calculator/Difference.java
new file mode 100644
index 0000000..49cead8
--- /dev/null
+++ b/Java-calculator/Difference.java
@@ -0,0 +1,13 @@
+import java.util.Scanner;
+public class Difference {
+    public static void main(String[]args)
+	{
+        	Scanner sc=new Scanner(System.in);
+        	System.out.println("enter first number: ");
+        	int num1=sc.nextInt();
+	     	System.out.println("enter second number: ");
+        	int num2=sc.nextInt();
+		int Total=num1-num2;
+		System.out.println("the Difference of "+num1+" and "+num2+" is "+Total);
+	}
+}
diff --git a/Java-calculator/Division.java b/Java-calculator/Division.java
new file mode 100644
index 0000000..5c388de
--- /dev/null
+++ b/Java-calculator/Division.java
@@ -0,0 +1,13 @@
+import java.util.Scanner;;
+public class Division {
+    public static void main(String[]args)
+	{
+        	Scanner sc=new Scanner(System.in);
+        	System.out.println("enter first number: ");
+        	int num1=sc.nextInt();
+		System.out.println("enter second number: ");
+        	int num2=sc.nextInt();
+		float Total=num1/num2;
+		System.out.println("the Division of "+num1+" and "+num2+" is "+Total);
+	}
+}
diff --git a/Java-calculator/Multiplication.java b/Java-calculator/Multiplication.java
new file mode 100644
index 0000000..0ecbb17
--- /dev/null
+++ b/Java-calculator/Multiplication.java
@@ -0,0 +1,13 @@
+import java.util.Scanner;
+public class Multiplication {
+    public static void main(String[]args)
+	{
+        	Scanner sc=new Scanner(System.in);
+        	System.out.println("enter first number: ");
+        	int num1=sc.nextInt();
+		System.out.println("enter second number: ");
+        	int num2=sc.nextInt();
+		int Total=num1*num2;
+		System.out.println("the Multiplication of "+num1+" and "+num2+" is "+Total);
+	}
+}
diff --git a/Java-circle-area-calculator/CircleArea.java b/Java-circle-area-calculator/CircleArea.java
new file mode 100644
index 0000000..1607043
--- /dev/null
+++ b/Java-circle-area-calculator/CircleArea.java
@@ -0,0 +1,11 @@
+import java.util.Scanner;
+public class CircleArea {
+    public static void main(String[]args)
+	{
+        	Scanner sc=new Scanner(System.in);
+        	System.out.println("enter the radius of the circle: ");
+			int r=sc.nextInt();
+			Double Area=3.14*r*r;
+			System.out.println("the Area of circle with radius "+r+" is "+Area);
+	}
+}
diff --git a/Java-circle-circumference-calculator/Circumference.java b/Java-circle-circumference-calculator/Circumference.java
new file mode 100644
index 0000000..6f29091
--- /dev/null
+++ b/Java-circle-circumference-calculator/Circumference.java
@@ -0,0 +1,10 @@
+import java.util.Scanner;
+public class Circumference {
+    public static void main(String[] args) {
+        Scanner sc=new Scanner(System.in);
+        System.out.println("enter the radius of the circle: ");
+        int r=sc.nextInt();
+        Double result=2*3.14*r;
+        System.out.println("the Circumference of circle with radius "+r+" is "+result);
+    }
+}
diff --git a/Java-helloworld/HelloWorld.java b/Java-helloworld/HelloWorld.java
new file mode 100644
index 0000000..167c4ab
--- /dev/null
+++ b/Java-helloworld/HelloWorld.java
@@ -0,0 +1,5 @@
+public class HelloWorld {
+    public static void main(String[] args) {
+        System.out.println("Hello World");
+    }
+}
diff --git a/Java-number-sorter/Sorter.java b/Java-number-sorter/Sorter.java
new file mode 100644
index 0000000..17c4326
--- /dev/null
+++ b/Java-number-sorter/Sorter.java
@@ -0,0 +1,30 @@
+import java.util.Scanner;
+public class Sorter {
+    public static void main(String[] args) {
+        Scanner sc=new Scanner(System.in);
+        System.out.println("enter size of array: ");
+        int n=sc.nextInt();
+        int[] a=new int[n];
+        int i,j;
+        System.out.println("enetr the elements :");
+        for(i=0;i<n;i++){
+            a[i]=sc.nextInt();
+        }
+        for(i=0;i<n;i++){
+            int loc=i;
+            for(j=i;j<n;j++){
+                if(a[j]<a[loc]){
+                    loc=j;
+                }
+                int t=a[loc];
+                a[loc]=a[i];
+                a[i]=t;
+            }
+        }
+        System.out.println("the sorted array is ");
+        for( i=0;i<n;i++){
+            System.out.println(a[i]);
+        }
+
+    }
+}
diff --git a/Java-random-number-generator/Random_Number.class b/Java-random-number-generator/Random_Number.class
new file mode 100644
index 0000000..98f9432
Binary files /dev/null and b/Java-random-number-generator/Random_Number.class differ
diff --git a/Java-random-number-generator/Random_Number.java b/Java-random-number-generator/Random_Number.java
new file mode 100644
index 0000000..58bd956
--- /dev/null
+++ b/Java-random-number-generator/Random_Number.java
@@ -0,0 +1,13 @@
+import java.util.*;
+public class Random_Number {
+    public static void main(String[] args) {
+        Scanner sc=new Scanner(System.in);
+        System.out.println("enter starting  range: ");
+        int min=sc.nextInt();
+        System.out.println("enter end range: ");
+        int max=sc.nextInt();
+        double a=Math.random()*(max-min+1)+min;
+        System.out.println("thre randome number between "+min+" and "+max+" is "+a);
+    }
+
+}
diff --git a/Java-rectangle-area-calculator/RectangleAreaCal.java b/Java-rectangle-area-calculator/RectangleAreaCal.java
index ed0dd99..2fac119 100644
--- a/Java-rectangle-area-calculator/RectangleAreaCal.java
+++ b/Java-rectangle-area-calculator/RectangleAreaCal.java
@@ -1,5 +1,4 @@
 import java.util.Scanner;
-
 public class RectangleAreaCal {
 
     public static void main(String[] args) {
diff --git a/Java-rectangle-perimeter-calculator/Rectangle_perimeter.java b/Java-rectangle-perimeter-calculator/Rectangle_perimeter.java
new file mode 100644
index 0000000..2998a7f
--- /dev/null
+++ b/Java-rectangle-perimeter-calculator/Rectangle_perimeter.java
@@ -0,0 +1,15 @@
+import java.util.Scanner;
+
+import java.util.Scanner;
+public class Rectangle_perimeter {
+    public static void main(String[] args) {
+        Scanner sc=new Scanner(System.in);
+        System.out.println("enter length of the rectangle: ");
+        Double l=sc.nextDouble();
+        System.out.println("enter breadth of the rectangle: ");
+        Double b=sc.nextDouble();
+        Double Total=2*(l+b);
+        System.out.println("the perimeter of the Rectangle of length "+l+" and breath "+b+" is "+Total);
+    }
+    
+}
diff --git a/Java-square-area-calculator/Square_Area.java b/Java-square-area-calculator/Square_Area.java
new file mode 100644
index 0000000..e40726d
--- /dev/null
+++ b/Java-square-area-calculator/Square_Area.java
@@ -0,0 +1,10 @@
+import java.util.Scanner;
+public class Square_Area {
+    public static void main(String[] args) {
+        Scanner sc=new Scanner(System.in);
+        System.out.println("enter size of the Square: ");
+        Double a=sc.nextDouble();
+        Double Total=a*a;
+        System.out.println("the Area of sqare of size "+a+" is "+Total);
+    }
+}
diff --git a/Java-square-perimeter-calculator/Square_perimeter.java b/Java-square-perimeter-calculator/Square_perimeter.java
new file mode 100644
index 0000000..b2eca7c
--- /dev/null
+++ b/Java-square-perimeter-calculator/Square_perimeter.java
@@ -0,0 +1,10 @@
+import java.util.*;
+public class Square_perimeter {
+    public static void main(String[] args) {
+        Scanner sc=new Scanner(System.in);
+        System.out.println("enter size of the Square: ");
+        Double a=sc.nextDouble();
+        Double Total=4*a;
+        System.out.println("the Perimeter of sqare of size "+a+" is "+Total);
+    }
+}
diff --git a/Java-time-spent-calculator/Time_Difference.class b/Java-time-spent-calculator/Time_Difference.class
new file mode 100644
index 0000000..55bfaf8
Binary files /dev/null and b/Java-time-spent-calculator/Time_Difference.class differ
diff --git a/Java-time-spent-calculator/Time_Difference.java b/Java-time-spent-calculator/Time_Difference.java
new file mode 100644
index 0000000..fb16d05
--- /dev/null
+++ b/Java-time-spent-calculator/Time_Difference.java
@@ -0,0 +1,43 @@
+import java.util.Scanner;
+public class Time_Difference {
+    public static void main(String[] args) {
+        Scanner sc=new Scanner(System.in);
+        System.out.println("enter strating time: ");
+        System.out.println("enter hours: ");
+        int start_hours=sc.nextInt();
+        System.out.println("enter minutes: ");
+        int start_minutes=sc.nextInt();
+        System.out.println("enter seconds: ");
+        int start_sec=sc.nextInt();
+        System.out.println("enter finishing time: ");
+        System.out.println("enter hours: ");
+        int finish_hours=sc.nextInt();
+        System.out.println("enter minutes: ");
+        int finish_minutes=sc.nextInt();
+        System.out.println("enter seconds: ");
+        int finish_sec=sc.nextInt();
+        int result_hours=0,result_minutes,result_sec;
+        if(finish_sec-start_sec<0){
+            start_minutes+=1;
+            result_sec=60+(finish_sec-start_sec);
+        }
+        else{
+            result_sec=finish_sec-start_sec;
+        }
+        if(finish_minutes-start_minutes<0){
+            start_hours+=1;
+            result_minutes=60+(finish_minutes-start_minutes);
+        }
+        else{
+            result_minutes=finish_minutes-start_minutes;
+        }
+        if(finish_hours-start_hours<0){
+            System.out.println("error invalid operation");
+        }
+        else{
+            result_hours=finish_hours-start_hours;
+        }
+        System.out.println("the Difference of the start time and finish time is "+result_hours+" : "+result_minutes+" : "+result_sec);
+    }
+    
+}