import Java Keyword

The import keyword makes one class or all classes in a package visible in the current Java source file.
Imported classes can be referened without the use of fully−qualified class names.

Examples

import java.io.File;
import java.net.*;

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case Java Keyword

The case is used to label each branch in a switch statement. Examples int arg = <some value>; switch (arg) { case 1: <statements> break; case 2: <statements> break; default: <statements> break; }

catch Java Keyword

The catch keyword is used to define exception handling blocks in try−catch or try−catch−finally statements. Examples try { <block that may throw exceptions> } catch (<java.lang.Exception or subclass> e) { <code to handle exception e> } try { <block that may throw different exceptions> } catch (FooException e) { <code to handle FooException e> } catch (BarException e) { <code to handle BarException e> } try { <block that may throw exceptions> } catch (<java.lang.Exception or subclass> e) { <code to handle exception e> } finally { <statements that execute with or without exception> }

Polymorphism and Dynamic Binding

Polymorphism: One piece of code works with all shape objects. Dynamic binding: How polymorphism is implemented Take previous Shape class hierarchy remove inheritance remove general and abstract class Shape

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