javaprogram

Banking program

A beginner-friendly console program for one account, starting with a balance of 0.0. It uses only standard Java and requires Java 14 or newer for the enhanced switch statement.

Compile and run from the repository directory:

javac BankingProgram.java
java BankingProgram

Choose 1 to show the balance, 2 to deposit, 3 to withdraw, or 4 to exit. Balances display two decimal places. Invalid menu selections and amounts leave the balance unchanged; negative amounts and overdrafts are rejected. Nonnumeric or non-finite amounts are also rejected, as are deposits that would overflow the balance. End-of-input exits cleanly.

How it works

• The while loop repeats the menu while isRunning is true.
• The enhanced switch selects the action; option 4 sets isRunning to false.
• Methods are static so main can call them without creating an account object.
• deposit() returns the valid amount to add to the balance, or 0 on rejection.
• withdraw(balance) returns the amount to subtract only if it is nonnegative and no greater than the current balance; otherwise it returns 0.
• One class-level Scanner is shared by main, deposit, and withdraw, and is closed when the program exits.