ข้อมูลจาก : http://www.sun.com/training/catalog/courses/CX-310-035.xml
Section 5: Operators and Assignments
Determine the result of applying any operator (including assignment operators and instance of) to operands of any type class scope or accessibility or any combination of these.
Determine the result of applying the boolean equals (Object) method to objects of any combination of the classes java.lang.String, java.lang.Boolean and java.lang.Object.
In an expression involving the operators &, |, &&, || and variables of known values state which operands are evaluated and the value of the expression.
Determine the effect upon objects and primitive values of passing variables into methods and performing assignments or other modifying operations in that method.
Rule
http://www.janeg.ca/scjp/oper/conversions.html
- byte -> short -> int -> long -> float -> double
- char -> int -> long -> float -> double
- Reference Conversion
- convert from any class, interface or array reference to an Object reference
- convert from any class to any interface that it implements
- convert from any class, interface or array type to a null reference
- convert from any subinterface to any interface it extends
- from any array to type Cloneable or type java.io.Serializable
- from any array of references to an array of compatible reference types
- the above conversions never produce a runtime error or require special action
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