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public class TestClass extends JFrame{
 
	JPanel panel;
	JTable table;
	JScrollPane scrollPane;
	Container C;
	JButton testButton;
	ActionListener changeListener;
 
	String[] columnNames1 = {"First Name","Last Name","Age"};
	String[] columnNames2 = {"First Name","Last Name","Height"};
 
	Object[][] data1 = {
				{"Mary", "Campione", "Snowboarding", "5"},
				{"Alison", "Huml", "Rowing", "3"},
					{"Kathy", "Walrath", "Knitting", "2"},
						{"Sharon", "Zakhour", "Speed reading", "20"},
						{"Philip", "Milne",	"Pool", "10"}};
 
	 Object[][] data2 = {
			{"James", "Keenan", "Hiking", "65"},
			{"Josh", "Huml", "Running", "37"},
				{"Billy", "Walrath", "Swimming", "21"},
					{"Robert", "Zakhour", "Golfing", "88"},
					{"Mike", "Milne",	"Soccer", "1"}};
 
	public TestClass(){
		testButton = new JButton("Change Data");
		changeListener = new ChangeListener();
		testButton.addActionListener(changeListener);
 
		panel = new JPanel();
		Container C = getContentPane();
		C = getContentPane();
		C.add(panel);
 
		table = new JTable(data1, columnNames1);
		scrollPane = new JScrollPane(table);
		table.setPreferredScrollableViewportSize(new Dimension(500, 70));
		panel.add(scrollPane);
		panel.add(testButton);
	}
 
	class ChangeListener implements ActionListener{
		public void actionPerformed(ActionEvent evt){
			System.out.println("Change Button pressed");
			//change contents of JTable
		}
	}
 
	public static void main(String[] args){
			Frame f = new TestClass();
			f.setSize(600,600);
			f.setVisible(true);
			f.setTitle("University Database Application");
	}
}

public class TestClass extends JFrame{ JPanel panel; JTable table; JScrollPane scrollPane; Container C; JButton testButton; ActionListener changeListener; String[] columnNames1 = {"First Name","Last Name","Age"}; String[] columnNames2 = {"First Name","Last Name","Height"}; Object[][] data1 = { {"Mary", "Campione", "Snowboarding", "5"}, {"Alison", "Huml", "Rowing", "3"}, {"Kathy", "Walrath", "Knitting", "2"}, {"Sharon", "Zakhour", "Speed reading", "20"}, {"Philip", "Milne", "Pool", "10"}}; Object[][] data2 = { {"James", "Keenan", "Hiking", "65"}, {"Josh", "Huml", "Running", "37"}, {"Billy", "Walrath", "Swimming", "21"}, {"Robert", "Zakhour", "Golfing", "88"}, {"Mike", "Milne", "Soccer", "1"}}; public TestClass(){ testButton = new JButton("Change Data"); changeListener = new ChangeListener(); testButton.addActionListener(changeListener); panel = new JPanel(); Container C = getContentPane(); C = getContentPane(); C.add(panel); table = new JTable(data1, columnNames1); scrollPane = new JScrollPane(table); table.setPreferredScrollableViewportSize(new Dimension(500, 70)); panel.add(scrollPane); panel.add(testButton); } class ChangeListener implements ActionListener{ public void actionPerformed(ActionEvent evt){ System.out.println("Change Button pressed"); //change contents of JTable } } public static void main(String[] args){ Frame f = new TestClass(); f.setSize(600,600); f.setVisible(true); f.setTitle("University Database Application"); } }