diff options
Diffstat (limited to 'java.html.markdown')
| -rw-r--r-- | java.html.markdown | 67 |
1 files changed, 25 insertions, 42 deletions
diff --git a/java.html.markdown b/java.html.markdown index 38b3c9aa..a6026651 100644 --- a/java.html.markdown +++ b/java.html.markdown @@ -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 @@ -208,47 +212,27 @@ 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){ - case 1: + case 1: monthString = "January"; break; - case 2: + case 2: monthString = "February"; break; - case 3: + 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."); - } /////////////////////////////////////// @@ -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 |