diff options
| -rw-r--r-- | java.html.markdown | 47 |
1 files changed, 45 insertions, 2 deletions
diff --git a/java.html.markdown b/java.html.markdown index 1fbf6a21..3cab973e 100644 --- a/java.html.markdown +++ b/java.html.markdown @@ -101,14 +101,17 @@ public class LearnJava { // Arrays //The array size must be decided upon instantiation - //The format for declaring an array is follows: + //The following formats work for declaring an arrow //<datatype> [] <var name> = new <datatype>[<array size>]; + //<datetype> <var name>[] = new <datatype>[<array size>]; int [] intArray = new int[10]; String [] stringArray = new String[1]; - boolean [] booleanArray = new boolean[100]; + boolean boolArray [] = new boolean[100]; // Another way to declare & initialize an array int [] y = {9000, 1000, 1337}; + String names [] = {"Bob", "John", "Fred", "Juan Pedro"}; + boolean bools[] = new boolean[] {true, false, false}; // Indexing an array - Accessing an element System.out.println("intArray @ 0: " + intArray[0]); @@ -405,6 +408,46 @@ class PennyFarthing extends Bicycle { } +//Interfaces +//Interface declaration syntax +//<access-level> interface <interface-name> extends <super-interfaces> { +// //Constants +// //Method declarations +//} + +//Example - Food: +public interface Edible { + public void eat(); //Any class that implements this interface, must implement this method +} + +public interface Digestible { + public void digest(); +} + + +//We can now create a class that implements both of these interfaces +public class Fruit implements Edible, Digestible { + public void eat() { + //... + } + + public void digest() { + //... + } +} + +//In java, you can extend only one class, but you can implement many interfaces. +//For example: +public class ExampleClass extends ExampleClassParent implements InterfaceOne, InterfaceTwo { + public void InterfaceOneMethod() { + + } + + public void InterfaceTwoMethod() { + + } +} + ``` ## Further Reading |