Constructors II

BankAccount.java

/** * Create a new bank account with the given balance */ public BankAccount(int initialAmount) { balance = initialAmount; }

More than one constructor may be declared for a class, provided that they can all be distinguished by their signature, i.e. the number of parameters and their types.

The selection of a particular constructor depends then on the parameter list given to the new operator.

Example 1: account = new BankAccount();
The default constructor is taken as no parameters are provided. Consequently, the balance is initialized to 0.

Example 2: account = new BankAccount(1000);
The other constructor (above) is taken and the balance is set to 1000 cents.

If just the second constructor above would have been provided, no default constructor would be available and a new operator without parameters would not permitted, i.e. example 1 would be rejected by the compiler.

	More than one constructor may be declared for a class, provided that they can all be distinguished by their signature, i.e. the number of parameters and their types.
	The selection of a particular constructor depends then on the parameter list given to the new operator.
	Example 1: `account = new BankAccount();` The default constructor is taken as no parameters are provided. Consequently, the balance is initialized to 0.
	Example 2: `account = new BankAccount(1000);` The other constructor (above) is taken and the balance is set to 1000 cents.
	If just the second constructor above would have been provided, no default constructor would be available and a new operator without parameters would not permitted, i.e. example 1 would be rejected by the compiler.