Lecture 2
14
Bank.java line 107
somewhere in Terminal.java
Message invoking a method
String command  =                                        atm.readWord(“transaction: ”);
readWord (String  prompt )
{
    print prompt on screen
    get first word user types
    return thatWord
}
prompt = “transaction: ”
command = thatWord
execution flow: line 107 in Bank.java sends a readWord message to a Terminal. Code for readWord method in Terminal.java runs, then work resumes at line 104 in Bank.java