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.Tutorial # 3. |
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Slide 1
// Instantiating An Object With Different Constructors
Car DefaultCar = new Car();
Car YourCar = new Car(... ..., ... ..., ... ..., ... ..., ... ...);
// Return Values
public boolean TurnOver(boolean blah) { return !blah; }
// System.out.println() vs.System.out.print()
System.out.print("He");
System.out.println("llo");
// Magic Numbers
private final int WHEELS = 4;
// Difference between assignment and declaration
/* Summary: Declaration introduces the variable & class while
Assignment assigns a variable.
Assignment: The association of a value with a variable; the new value
replaces any previous value associated with the variable.
Assignment Statement: A statement that results in an assignment; the
statement consists of the name of the variable being assigned, the
assignment operator =, and an expression that gives the value that is
assigned to the variable.
Declaration: A java statement that introduces a variable into a Java
program. A declaration of a reference variable specifies the name
of the variable and the class of object to which it may refer.*/
int num = 5; // both
// OR //
int num; // declaration
num = 5; // assignment
String name = new String("John"); // both
// OR //
String name; // declaration
name = new String("John"); // assignment
name = "John"; // assignment again, same thing
Snippet.java - A snippet of code we will be reviewing CarProgram.java - CarProgram (Version 2) Car.java - Car (Version 2) |