Create Simple Bank System.java

varunu28 · web-flow · commit 96a599fc14e3 · 2021-10-17T20:53:33.000-05:00
diff --git a/Medium/Simple Bank System.java b/Medium/Simple Bank System.java
@@ -0,0 +1,44 @@
+class Bank {
+
+  private long[] balance;
+  public Bank(long[] balance) {
+    this.balance = balance;
+  }
+
+  public boolean transfer(int account1, int account2, long money) {
+    if (isInvalidAccount(account1) || isInvalidAccount(account2) || balance[account1 - 1] < money) {
+      return false;
+    }
+    balance[account1 - 1] -= money;
+    balance[account2 - 1] += money;
+    return true;
+  }
+
+  public boolean deposit(int account, long money) {
+    if (isInvalidAccount(account)) {
+      return false;
+    }
+    balance[account - 1] += money;
+    return true;
+  }
+
+  public boolean withdraw(int account, long money) {
+    if (isInvalidAccount(account) || balance[account - 1] < money) {
+      return false;
+    }
+    balance[account - 1] -= money;
+    return true;
+  }
+
+  private boolean isInvalidAccount(int accountId) {
+    return !(accountId >= 1 && accountId <= this.balance.length);
+  }
+}
+
+/**
+ * Your Bank object will be instantiated and called as such:
+ * Bank obj = new Bank(balance);
+ * boolean param_1 = obj.transfer(account1,account2,money);
+ * boolean param_2 = obj.deposit(account,money);
+ * boolean param_3 = obj.withdraw(account,money);
+ */
