CongSon Nguyen

I still don't get it. Can you please explain more clearly ?

Java.sun.com said "Thread.sleep causes the current thread to suspend execution for a specified period. This is an efficient means of making processor time available to the other threads of an application or other applications that might be running on a computer system".
Even when we don't use Thread.sleep(...), processor time is still available to the other threads -> I do not really understand it.

class A implements Runnable{ private String title; public A(String title){ this.title = title; } public void run() { while(true){ System.out.println(title + " is running"); } } } public class myThread { public static void main(String[] args){ Thread t1 = new Thread(new A("AAA")); Thread t2 = new Thread(new A("BBB")); t1.start(); t2.start(); } }

When we use Thread, we should call Thread.sleep() so that other thread has a chance to execute. However, in my simple app above, I do not need to use Thread.sleep(...), but both thread still have a chance to execute. So, why is it ? Is it because of multicore in my CPU ? If so, we do not need to use Thread.sleep(...). Can anyone please help me ? Thanks a lot.

Thanks, Rob Camick. I'm sorry.

When I add a new data row to the table, the scrollbar keeps staying at the same place (not move down). Here's the code:


package nhap; import java.awt.BorderLayout; import java.awt.Container; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JTable; import javax.swing.table.DefaultTableModel; public class ModelJTable extends JFrame { private DefaultTableModel model; private JTable table; public ModelJTable() { super(); model = new DefaultTableModel(); model.addColumn("First Name"); model.addColumn("Last Name"); model.addColumn("Years"); String[] socrates = { "Socrates", "", "469-399 B.C." }; model.addRow(socrates); String[] plato = { "Plato", "", "428-347 B.C." }; model.addRow(plato); String[] aquinas = { "Thomas", "Aquinas", "1225-1274" }; model.addRow(aquinas); String[] kierkegaard = { "Soren", "Kierkegaard", "1813-1855" }; model.addRow(kierkegaard); String[] kant = { "Immanuel", "Kant", "1724-1804" }; model.addRow(kant); String[] nietzsche = { "Friedrich", "Nietzsche", "1844-1900" }; model.addRow(nietzsche); String[] arendt = { "Hannah", "Arendt", "1906-1975" }; model.addRow(arendt); table = new JTable(model); JButton addButton = new JButton("Add Philosopher"); addButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent event) { String[] philosopher = { "", "", "" }; model.addRow(philosopher); } }); JButton removeButton = new JButton("Remove Selected Philosopher"); removeButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent event) { model.removeRow(table.getSelectedRow()); } }); JPanel inputPanel = new JPanel(); inputPanel.add(addButton); inputPanel.add(removeButton); Container container = getContentPane(); container.add(new JScrollPane(table), BorderLayout.CENTER); container.add(inputPanel, BorderLayout.NORTH); setDefaultCloseOperation(EXIT_ON_CLOSE); setSize(400, 200); //pack(); setVisible(true); } public static void main(String args[]) { new ModelJTable(); } }

How can I make the scrollbar go down ? I tried to search Google for answer, but so far I've not found any one. Thanks for your help.