Assignment_4 Added

Assignment_4.md

@@ -0,0 +1,64 @@
+package Core_Java_Assignments;
+
+import java.io.*;
+
+// Account class With initial Balance of 1000
+class Account {
+
+    int balance = 1000;
+
+    void widraw(int bal) {
+        this.balance = balance - bal;
+
+    }
+
+    public int getbal() {
+        return balance;
+    }
+}
+
+// Thread Decleration and exexution
+
+public class Assignment_4 extends Thread {
+
+    Account acc = new Account();
+
+    public static void main(String[] args) {
+        Assignment_4 Asign = new Assignment_4();
+        Thread p1 = new Thread(Asign, "Person_1");
+        Thread p2 = new Thread(Asign, "Person_2");
+        p1.start();
+        p2.start();
+
+    }
+
+    @Override
+    public void run() {
+
+        for (int i = 0; i < 2; i++) {
+            widrawMoney(100);
+//widrawMoney(500);
+//widrawMoney(800);
+        }
+    }
+
+    // To Make The Program Thread Safe I used synchronized method. 
+    private synchronized void widrawMoney(int bal) {
+        if (acc.getbal() >= bal) {
+            System.out.println(Thread.currentThread().getName() + "Is Trying to widraw : " + bal);
+            try {
+
+                Thread.sleep(1000);
+            } catch (Exception e) {
+                e.printStackTrace();
+            }
+            acc.widraw(bal);
+
+            System.out.println(Thread.currentThread().getName() + " Is completed The widrawal of : " + bal);
+            System.out.println("Avalible Balance :" + acc.getbal());
+        } else {
+            System.out.println("Account Does Not Have Enough Money To widraw.." + '\n' + "Please make Deposit..!");
+        }
+
+    }
+}