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Edited back java updates a bit

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Adam 2013-07-07 21:11:29 -07:00
parent 86395dd83d
commit 4936dcf810
1 changed files with 25 additions and 42 deletions
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@ -16,7 +16,8 @@ Java is a general-purpose, concurrent, class-based, object-oriented computer pro
Multi-line comments look like this.
*/
/**
JavaDoc comments look like this. Used to describe the Class or various attributes of a Class.
JavaDoc comments look like this. Used to describe the Class or various
attributes of a Class.
*/
// Import ArrayList class inside of the java.util package
@ -61,12 +62,16 @@ public class LearnJava {
// Long - 64-bit signed two's complement integer
// (-9,223,372,036,854,775,808 <= long <= 9,223,372,036,854,775,807)
long fooLong = 100000L; // L is used to denote that this variable value is of type Long; else it is treated as integer by default.
long fooLong = 100000L;
// L is used to denote that this variable value is of type Long;
// anything without is treated as integer by default.
// Note: Java has no unsigned types
// Float - Single-precision 32-bit IEEE 754 Floating Point
float fooFloat = 234.5f; // f is used to denote that this variable value is of type float; else it is treated as double.
float fooFloat = 234.5f;
// f is used to denote that this variable value is of type float;
// otherwise it is treated as double.
// Double - Double-precision 64-bit IEEE 754 Floating Point
double fooDouble = 123.4;
@ -150,7 +155,6 @@ public class LearnJava {
& Bitwise AND
^ Bitwise exclusive OR
| Bitwise inclusive OR
[Java Bitwise Operators](http://docs.oracle.com/javase/tutorial/java/nutsandbolts/op3.html)
*/
// Incrementations
@ -168,12 +172,12 @@ public class LearnJava {
// If statements are c-like
int j = 10;
if (j == 10){ // Evaluates to true only if value of j is equal to 10.
System.out.println("In this case, I get executed and I print this since j is equal to 10.");
} else if (i > 10) { // Evaluates to true only if value of j is greater than 10.
System.out.println("I never run if j = 10; I will run only if j is greater than 10");
} else { // If none of the above if-conditions match, then control will fall back to else-condition; In this case, if value of j is less than 10.
System.out.println("I also never run if j = 10; I will run only if j is less than 10");
if (j == 10){
System.out.println("I get printed");
} else if (j > 10) {
System.out.println("I don't");
} else {
System.out.println("I also don't");
}
// While loop
@ -208,8 +212,10 @@ public class LearnJava {
System.out.println("fooFor Value: " + fooFor);
// Switch Case
//A switch works with the byte, short, char, and int primitive data types.
//It also works with enumerated types (discussed in Enum Types), the String class, and a few special classes that wrap certain primitive types: Character, Byte, Short, and Integer.
// A switch works with the byte, short, char, and int data types.
// It also works with enumerated types (discussed in Enum Types),
// the String class, and a few special classes that wrap
// primitive types: Character, Byte, Short, and Integer.
int month = 3;
String monthString;
switch (month){
@ -222,34 +228,12 @@ public class LearnJava {
case 3:
monthString = "March";
break;
default: //The default section handles all values that are not explicitly handled by one of the case sections.
default:
monthString = "Some other month";
break;
}
System.out.println("Switch Case Result: " + monthString);
// Effective JDK 7.0, Strings can be used for case-matching in Switch statement.
final String dayOfWeek = "Friday";
switch (dayOfWeek) {
case "Monday":
System.out.println("Aargh!! Start of the work week!");
break;
case "Tuesday":
case "Wednesday":
case "Thursday":
System.out.println("Midweek");
break;
case "Friday":
System.out.println("Awesome! End of work week");
break;
case "Saturday":
case "Sunday":
System.out.println("Weekend");
break;
default:
System.out.println("There is no such weekday, at least on our planet.");
}
///////////////////////////////////////
// Converting Data Types And Typcasting
@ -287,11 +271,10 @@ public class LearnJava {
Bicycle trek = new Bicycle();
// Call object methods
trek.speedUp(3); // Should always use setter and getter methods to access the attributes of a class
trek.speedUp(3); // You should always use setter and getter methods
trek.setCadence(100);
// toString is a convention to display the attribute values of this Object.
// Has to be overridden in the POJO (Plain Old Java Objects) to see the actual values else internal representation of the address will be displayed.
// toString is a convention to display the value of this Object.
System.out.println("trek info: " + trek.toString());
} // End main method
@ -312,7 +295,7 @@ class Bicycle {
// Bicycle's Fields/Variables
public int cadence; // Public: Can be accessed from anywhere
private int speed; // Private: Only accessible from within the class
protected int gear; // Protected: Accessible from the class and all the subclasses
protected int gear; // Protected: Accessible from the class and subclasses
String name; // default: Only accessible from within this package
// Constructors are a way of creating classes