Primitive | Wrapper Class | Constructor Arguments |
boolean | Boolean | boolean or String |
char | Character | char |
byte | Byte | byte or String |
short | Short | short or String |
int | Integer | int or String |
long | Long | long or String |
float | Float | float, double, or String |
double | Double | double or String |
Saturday, April 16, 2011
Wrapper Classes and Their Constructor Arguments
Labels:
Java
Default Values for Primitives and Refrence Types in Java
Variable Type | Default Value |
Object reference | null (not referencing any object) |
byte, short, int, long | 0 |
float, double | 0.0 |
boolean | false |
char | '\u0000' |
Labels:
Java
SCJP Exam Watch 11 - Access instance variable/method from static mathod
One of the mistakes most often made by new Java programmers is attempting to access an instance variable (which means nonstatic variable) from the static main() method (which doesn't know anything about any instances, so it can't access the variable). The following code is an example of illegal access of a nonstatic variable from a static method:
Understand that this code will never compile, because you can't access a nonstatic (instance) variable from a static method. Just think of the compiler saying, "Hey, I have no idea which Foo object's x variable you're trying to print!". Remember, it's the class running the main() method, not an instance of the class.
Of course, the tricky part for the exam is that the question won't look as obvious as the preceding code. The problem you're being tested for accessing a nonstatic variable from a static method will be buried in code that might appear to be testing something else. For example, the preceding code would be more likely to appear as
Refrence: SCJP Sun® Certified Programmer for Java™ 6 Study Guide Exam (310-065)
class Foo { int x = 3; public static void main(String[] args) { system.out.println("x is " + x); } }
Understand that this code will never compile, because you can't access a nonstatic (instance) variable from a static method. Just think of the compiler saying, "Hey, I have no idea which Foo object's x variable you're trying to print!". Remember, it's the class running the main() method, not an instance of the class.
Of course, the tricky part for the exam is that the question won't look as obvious as the preceding code. The problem you're being tested for accessing a nonstatic variable from a static method will be buried in code that might appear to be testing something else. For example, the preceding code would be more likely to appear as
class Foo { int x = 3; float y = 4.3f; public static void main(String[] args) { for (int z - x; z < ++x; z--, y = y + z) { // complicated looping and branching code } } }So, while you're trying to follow the logic, the real issue is that x and y can't be used within main(), because x and y are instance, not static, variables! The same applies for accessing nonstatic methods from a static method. The rule is, a static method of a class can't access a nonstatic (instance) method or variable of its own class.
Refrence: SCJP Sun® Certified Programmer for Java™ 6 Study Guide Exam (310-065)
Sunday, April 10, 2011
Compiler generated constractor code
class Foo {}======>
class Foo { Foo() { super(); } }
class Foo { Foo() {} }======>
class Foo { Foo() { super(); } }
public class Foo {}======>
public class Foo { public Foo() { super(); } }
class Foo { Foo(String s) {} }======>
class Foo { Foo(String s) { super(); } }
class Foo { Foo(String s) { super(); } }======>
Nothing, compiler doesn't need to insert anything.
class Foo { void Foo() {} }======>
class Foo { void Foo() {} Foo() { super(); } }
(void Foo() is a method, not a constructor.)
Refrence: SCJP Sun® Certified Programmer for Java™ 6 Study Guide Exam (310-065)
Labels:
Java
SCJP Exam Watch 10 - Methods return an abstract class or interface
Watch for methods that declare an abstract class or interface return type, and know that any object that passes the IS-A test (in other words, would test true using the instanceof operator) can be returned from that method - for example:
This code will compile, the return value is a subtype.
Refrence: SCJP Sun® Certified Programmer for Java™ 6 Study Guide Exam (310-065)
public abstract class Animal {} public class Bear extends Animal {} public class Test { public Animal go () { return new Bear(); // OK, Bear "is-a" Animal } }
This code will compile, the return value is a subtype.
Refrence: SCJP Sun® Certified Programmer for Java™ 6 Study Guide Exam (310-065)
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