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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. 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 // Import ArrayList class inside of the java.util package
@ -61,12 +62,16 @@ public class LearnJava {
// Long - 64-bit signed two's complement integer // Long - 64-bit signed two's complement integer
// (-9,223,372,036,854,775,808 <= long <= 9,223,372,036,854,775,807) // (-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 // Note: Java has no unsigned types
// Float - Single-precision 32-bit IEEE 754 Floating Point // 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 - Double-precision 64-bit IEEE 754 Floating Point
double fooDouble = 123.4; double fooDouble = 123.4;
@ -150,7 +155,6 @@ public class LearnJava {
& Bitwise AND & Bitwise AND
^ Bitwise exclusive OR ^ Bitwise exclusive OR
| Bitwise inclusive OR | Bitwise inclusive OR
[Java Bitwise Operators](http://docs.oracle.com/javase/tutorial/java/nutsandbolts/op3.html)
*/ */
// Incrementations // Incrementations
@ -168,12 +172,12 @@ public class LearnJava {
// If statements are c-like // If statements are c-like
int j = 10; int j = 10;
if (j == 10){ // Evaluates to true only if value of j is equal to 10. if (j == 10){
System.out.println("In this case, I get executed and I print this since j is equal to 10."); System.out.println("I get printed");
} else if (i > 10) { // Evaluates to true only if value of j is greater than 10. } else if (j > 10) {
System.out.println("I never run if j = 10; I will run only if j is greater than 10"); System.out.println("I don't");
} 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. } else {
System.out.println("I also never run if j = 10; I will run only if j is less than 10"); System.out.println("I also don't");
} }
// While loop // While loop
@ -208,47 +212,27 @@ public class LearnJava {
System.out.println("fooFor Value: " + fooFor); System.out.println("fooFor Value: " + fooFor);
// Switch Case // Switch Case
//A switch works with the byte, short, char, and int primitive data types. // 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 certain primitive types: Character, Byte, Short, and Integer. // 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; int month = 3;
String monthString; String monthString;
switch (month){ switch (month){
case 1: case 1:
monthString = "January"; monthString = "January";
break; break;
case 2: case 2:
monthString = "February"; monthString = "February";
break; break;
case 3: case 3:
monthString = "March"; monthString = "March";
break; break;
default: //The default section handles all values that are not explicitly handled by one of the case sections. default:
monthString = "Some other month"; monthString = "Some other month";
break; break;
} }
System.out.println("Switch Case Result: " + monthString); 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.");
}
/////////////////////////////////////// ///////////////////////////////////////
@ -287,11 +271,10 @@ public class LearnJava {
Bicycle trek = new Bicycle(); Bicycle trek = new Bicycle();
// Call object methods // 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); trek.setCadence(100);
// toString is a convention to display the attribute values of this Object. // toString is a convention to display the value 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.
System.out.println("trek info: " + trek.toString()); System.out.println("trek info: " + trek.toString());
} // End main method } // End main method
@ -312,7 +295,7 @@ class Bicycle {
// Bicycle's Fields/Variables // Bicycle's Fields/Variables
public int cadence; // Public: Can be accessed from anywhere public int cadence; // Public: Can be accessed from anywhere
private int speed; // Private: Only accessible from within the class 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 String name; // default: Only accessible from within this package
// Constructors are a way of creating classes // Constructors are a way of creating classes