4 Declarations and Access Control


4.1
 public class EditContext {     private Object selected;     public void setSelected(Object newSelected) {         selected = newSelected;     }     public Object getSelected() {         return selected;     } } 
4.2
 public interface Tool {     public void setContext(EditContext newContext);     public boolean isActive(); } 
4.3
 // Filename: Database.java // Specify package package com.megabankcorp.system; // Allow usage of Account class simply by referring to the name Account. import com.megabankcorp.records.Account; // Class must be abstract since it has abstract methods. public abstract class Database {     // Abstract and available from anywhere.     public abstract void deposit(Account acc, long amount);     // Abstract and available from anywhere.     public abstract void withdraw(Account acc, long amount);     // Abstract and only available from package and subclasses.     protected abstract long amount(Account acc);     // Unmodifiable and only available from package.     final void transfer(Account from, Account to, long amount) {         withdraw(from, amount);         deposit(to, amount);     } } 


A Programmer[ap]s Guide to Java Certification
A Programmer[ap]s Guide to Java Certification
ISBN: 201596148
EAN: N/A
Year: 2003
Pages: 284

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