Penggunaan Dialog Box

Scanner
3.13

 public class Account  
 {  
   private double balance;  
   public Account(double initialBalance){  
     if(initialBalance > 0.0)  
       balance = initialBalance;  
   }  
   public void credit(double amount){  
     balance = balance + amount;  
   }  
   public double getBalance(){  
     return balance;  
   }  
 }  

3.14

 import java.util.Scanner;  
 public class AccountTest  
 {  
   public static void main(String[] args){  
     Account account1 = new Account(50.00);  
     Account account2 = new Account(-7.53);  
     System.out.printf("account1 balance: $%.2f\n", account1.getBalance());  
     System.out.printf("account2 balance: $%.2f\n", account2.getBalance());  
     Scanner input = new Scanner(System.in);  
     double depositAmount;  
     System.out.print("Enter deposit amount for account1: ");  
     depositAmount = input.nextDouble();  
     System.out.printf("\nadding %.2f to account1 balance\n\n", depositAmount);  
     account1.credit(depositAmount);  
     System.out.printf("account1 balance: $%.2f\n", account1.getBalance());  
     System.out.printf("account2 balance: $%.2f\n", account2.getBalance());  
     System.out.print("Enter deposit amount for account2: ");  
     depositAmount = input.nextDouble();  
     System.out.printf("\nadding %.2f to account2 balance\n\n", depositAmount);  
     account2.credit(depositAmount);  
     System.out.printf("account1 balance: $%.2f\n", account1.getBalance());  
     System.out.printf("account2 balance: $%.2f\n", account2.getBalance());  
   }  
 }  

Libary

1. Dialog Box

  import javax.swing.JOptionPane;   
  public class Dialog1   
  {   
   public static void main (String[] args)   
   {   
    JOptionPane.showMessageDialog(null,"Welcome to java");   
   }   
  }   

2.Name Dialog Box

  import javax.swing.JOptionPane;   
  public class NameDialog   
  {   
   public static void main(String[] args)   
   {   
    String name=JOptionPane.showInputDialog("What is your name?");   
    String message=String.format("Welcome, %s, to Java Programming!", name);   
    JOptionPane.showMessageDialog(null, message);   
   }   
  } 

3. Memodifikasi Account Test mengguanakan Dialog Box

  import javax.swing.JOptionPane;   
  public class AccountTestDialogBox   
  {   
   public static void main (String[] args)   
   {   
    Account account1 = new Account (50.00);   
    Account account2 = new Account (-7.53);   
    String output1 = String.format ("account1 balance : $%.2f\naccount2 balance : $%.2f\n\n", account1.getBalance(), account2.getBalance());   
    JOptionPane.showMessageDialog (null, output1);   
    String input1 = JOptionPane.showInputDialog ("Enter deposit amount for account1 : ");   
    Double input1a = Double.parseDouble (input1);   
    account1.credit (input1a);    
    String message1 = String.format ("\nadding %s to account1 balance\n\n", input1);   
    JOptionPane.showMessageDialog (null, message1);   
    String output2 = String.format ("account1 balance : $%.2f\naccount2 balance : $%.2f\n\n", account1.getBalance(), account2.getBalance());   
    JOptionPane.showMessageDialog (null, output2);   
    String input2 = JOptionPane.showInputDialog ("Enter deposit amount for account2 : ");   
    Double input2a = Double.parseDouble (input2);   
    account2.credit (input2a);   
    String message2 = String.format ("\nadding %s to account2 balance\n\n", input2);   
    JOptionPane.showMessageDialog (null, message2);   
    String output3 = String.format ("account1 balance : $%.2f\naccount2 balance : $%.2f\n", account1.getBalance(), account2.getBalance());   
    JOptionPane.showMessageDialog (null, output3);   
   }   
  }