Java : practical guide for programmers - download pdf or read online


By Zbigniew M Sikora

ISBN-10: 0585449961

ISBN-13: 9780585449968

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In the case of a withdrawal from our bank account, the balance will be decreased by the amount withdrawn. If the resulting balance is less than zero, an error message is printed and no withdrawal is made. We would also like our method to return the value of the outstanding balance. println(''Insufficient Funds"); } else { balance = balance - amount; } return balance; } Later in Chapter 6, we will see how the Java exception mechanism provides a better way to report this condition. Note the return statement in the withdraw method.

Println(string1 + args[0] + string2 + area); The + is used as a concatenation operator. Where a String is concatenated with a value that is not a String, such as args[0] or area, the compiler will convert that value to a String. A String is actually an object in Java; we discuss objects in detail in Chapter 4. A string can be created using the following objectlike syntax: String string1 = new String("A circle of radius "); This statement, and the statement String string1 = "A circle of radius "; are both legal in Java.

1 Class and Object with No Methods To start, we will define a class, Account, corresponding to a bank account. This class will have member variables defined for account number, account name, and balance. At this stage, we have defined no methods for this class. Account 1 2 3 4 5 class Account { int accountNo; String accountName; double balance; } Account The class identifier, Account, in line 1 can be any valid Java identifier. By convention, class identifiers are nouns, in mixed case with the first letter of each internal word capitalized.

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Java : practical guide for programmers by Zbigniew M Sikora

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