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Objects have:
Characteristics or attributes
construction schemes called constructors
sets of actions called methods |
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| a text file that containts the specification fo a java class. car.java |
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| the smallest syntactic unit in java |
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| a sequence of characters wrapped in a double quote |
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| the java method where application execution begins. Always Static. |
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| The first line of a class definition; it includes the name of the class. |
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A java access qualifier. If a method is marked public, then it is directly accessible in any other class. |
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Case Sensitive(system.out.println != System.out.println
Statements always end with a Semicolon
Packaging markers, such as " ", (), {}, must always match
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| "=" is the assignment operator. it does not mean equality. |
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retrieves the value of an object's attributes.
ex .getAge();
"." is the invocation symbol |
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| Changes an object's state. |
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a statement used to construct an object from that class.
public Car(String what, double cap, double amt) {
make =what;
fuelCapacity = cap;
fuelAmount = amt;
} |
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A variable given in a method or constructor definition.
ex. f(x)=3*x; "x" is the formal parameter |
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| Java keyword. Return type for a method indication no value is returned. Mutator methods, and methods that make "announcements" using print and println statements have return type void |
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Associated w/ the formal parameter.
f(x)=3*x is the formal parameter
f(3)=3*x is the actual parameter |
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| The names given to variables, constants, classes, $ methods. |
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| Car stacysCar = new Car("Honda",12.0,4.5); |
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| Constructor. creates a new car object called stacysCar. |
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| Attribute (or Instance Variable) |
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| A feature or characteristic of an object. |
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A method in the String class. "Length" reports the length of the string; the nuber of charecters in the string.
String s = "woof";
int len = s.length();
woof has a length of 4 characters, w=0, f=3 |
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| Identifies a package or file that is to be included in (made available to) the class bearing the import statement |
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