Databases
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Postsdbo
PO
 

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  1. PO
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    <p><img src="https://i.stack.imgur.com/qSAUW.png" alt="enter image description here"></p> <pre><code>public class TestReceipts { public static void main(String[] args) { new TestReceipts(); } public TestReceipts() { EventQueue.invokeLater(new Runnable() { @Override public void run() { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch (ClassNotFoundException ex) { } catch (InstantiationException ex) { } catch (IllegalAccessException ex) { } catch (UnsupportedLookAndFeelException ex) { } JFrame frame = new JFrame("Bill me"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(600, 400); frame.setLocationRelativeTo(null); frame.setLayout(new BorderLayout()); frame.add(new ReceiptPane()); frame.setVisible(true); } }); } protected class ReceiptPane extends JPanel { private JTextArea textArea; public ReceiptPane() { setLayout(new BorderLayout()); textArea = new JTextArea(); textArea.setEditable(false); add(new JScrollPane(textArea)); List&lt;Item&gt; lstItems = new ArrayList&lt;Item&gt;(25); lstItems.add(new Item("Cakes", 1.5d, 5)); lstItems.add(new Item("Cakes with cream", 2d, 5)); lstItems.add(new Item("Cakes with chocolate", 2d, 5)); lstItems.add(new Item("Cakes with chocolate &amp; cream", 2.5d, 5)); lstItems.add(new Item("Diet Coke (Can)", 2.5d, 5)); generateReceipt(lstItems, 100d); } protected void generateReceipt(List&lt;Item&gt; lstItems, double amountTendered) { List&lt;List&lt;String&gt;&gt; lstRows = new ArrayList&lt;List&lt;String&gt;&gt;(25); int totalQty = 0; double subTotal = 0; NumberFormat nf = NumberFormat.getCurrencyInstance(); for (Item item : lstItems) { String unit = nf.format(item.getUnitCost()); String total = nf.format(item.getUnitCost() * item.getQty()); lstRows.add(createRow( Integer.toString(item.getQty()), item.getDescription(), unit, total)); subTotal += item.getUnitCost() * item.getQty(); } int maxWidth = 60; int qtyWidth = 4; int unitWidth = 8; int totalWidth = 8; int descWidth = maxWidth - qtyWidth - unitWidth - totalWidth; StringBuilder sbHeader = new StringBuilder(maxWidth); sbHeader.append("Qty "); sbHeader.append(fillWith("Item", " ", descWidth)); sbHeader.append(padWith("Cost", " ", unitWidth)); sbHeader.append(padWith(" Total", " ", totalWidth)); textArea.append(sbHeader.toString() + "\n"); System.out.println(sbHeader.toString()); for (List&lt;String&gt; row : lstRows) { StringBuilder sb = new StringBuilder(maxWidth); sb.append(padWith(row.get(0), " ", 3)); sb.append(" "); String desc = row.get(1); if (desc.length() &gt; descWidth) { desc = desc.substring(0, descWidth); } sb.append(fillWith(desc, ".", descWidth)); sb.append(padWith(row.get(2), " ", unitWidth)); sb.append(padWith(row.get(3), " ", totalWidth)); textArea.append(sb.toString() + "\n"); } textArea.append(padWith("Sub-total " + padWith(nf.format(subTotal), " ", totalWidth), " ", maxWidth) + "\n"); double tax = subTotal * 0.1d; textArea.append(padWith("Tax " + padWith(nf.format(tax), " ", totalWidth), " ", maxWidth) + "\n"); double total = tax + subTotal; textArea.append(padWith("Total " + padWith(nf.format(total), " ", totalWidth), " ", maxWidth) + "\n"); textArea.append(padWith("Total " + padWith(nf.format(amountTendered), " ", totalWidth), " ", maxWidth) + "\n"); double change = amountTendered - total; textArea.append(padWith("Change " + padWith(nf.format(change), " ", totalWidth), " ", maxWidth) + "\n"); } protected List&lt;String&gt; createRow(String... columns) { return Arrays.asList(columns); } } public static String fillWith(String sValue, int width) { StringBuilder sb = new StringBuilder(width); for (int index = 0; index &lt; width; index++) { sb.append(sValue); } return sb.toString(); } public static String fillWith(String sValue, String fill, int width) { return sValue + fillWith(fill, width - sValue.length()); } public static String pad(int iValue, int iMinLength) { return pad(Integer.toString(iValue), iMinLength); } public static String pad(String sValue, int iMinLength) { return padWith(sValue, "0", iMinLength); } public static String padWith(String value, String padding, int iMinLength) { StringBuilder sb = new StringBuilder(iMinLength); sb.append(value); while (sb.length() &lt; iMinLength) { sb.insert(0, padding); } return sb.toString(); } protected class Item { private String description; private double unitCost; private int qty; public Item(String description, double unitCost, int qty) { this.description = description; this.unitCost = unitCost; this.qty = qty; } public String getDescription() { return description; } public double getUnitCost() { return unitCost; } public int getQty() { return qty; } } } </code></pre>
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    1. This table or related slice is empty.
    1. POHow to show the computation area in JTextArea field? Like a receipt with tax and total and change
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      1. PTQuestion
    1. PTAnswer
    1. This table or related slice is empty.
    1. USMadProgrammer
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. VO
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      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COthanks! i've been trying this one too but it seems that i forget something.. i'll try it now. this has been a good help anyway :)
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      1. PO
      1. USghie
 

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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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