Introduction to Algorithms, Programming, and Compilers Practice Test

A bank account program models each account as an object with encapsulated state (balance) and methods to change it. The withdraw method checks rules before updating the private field:

public boolean withdraw(double amount) {

  if (amount <= balance) {

    balance -= amount;

    return true;

  }

  return false;

}

Based on the passage, what is the main benefit of calling withdraw instead of changing balance directly?​

A bank account program stores balance inside each object and uses methods to update it. The balance field is private, so other classes cannot access it directly:

private double balance;

Based on the passage, why is making balance private consistent with encapsulation?​