head first java

head first java

head first java reading notes

• This book is suitable for zero-based entry, there are certain programming based on people watching but there will be little redundant.

• Java, integer
  and boolean are two types. And is not compatible. Boolean must
  be tested boolean variable. isHot = true; while (isHot) {}

• There are hundreds of built-java class, java API of java libraries.

• instanceof determines whether a class

• Only in reference to a variable class does have the method to call it, the public methods of the class as is the content of the contract, the contract is a commitment agreement to other programs.

• super.runReport () method calls the parent class.

• If you write a constructor with arguments, no-argument constructor also need to write one.

• Reference means is null, the reference count is 0, the object will be garbage collected machine (GC) manufactured released.

• Static final variables constant, is marked as a variable representing the final once it is initialized not change. After the class is loaded static final variable will always maintain its value.

• Use static import, a bit like in the global namespace C ++.

Difference Iaas, Paas and Saas of

• Used to describe Pizza