Oop lecture9

Dec 28, 2012Download as ppt, pdf0 likes220 views

The document discusses implementing listeners and overriding methods in Java. It shows code to add an item change listener to a combo box that prints the selected item to a text field. It also demonstrates overriding the paint() method to draw shapes on a panel and overriding the getCgpa() method to calculate grade point averages differently in subclasses.

Lecture 9
More on implementing Listeners

Object Oriented Programming
Eastern University, Dhaka
Md. Raihan Kibria

Add a combo box

We will add an
item change
listener and print
to console.

See next page
for code

$public class ComboDemo extends JFrame { ComboDemo(){ super.setBounds(0, 0, 500, 400); super.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); super.setLayout(new FlowLayout()); final JTextField text = new JTextField("Select an item"); class MyItemListener implements ItemListener{ JComboBox combo; MyItemListener(JComboBox combo){ this.combo = combo; } public void itemStateChanged(ItemEvent e) { text.setText(combo.getSelectedItem().toString()); } } JComboBox combo = new JComboBox(new String[]{"Square", "Circle", "Triangle"}); combo.addItemListener(new MyItemListener(combo)); super.add(combo); super.add(text); super.setVisible(true); } public static void main(String[] args){ new ComboDemo(); } }$

$Overriding paint method of Component public class OverridePaintDemo { public static void main(String[] args) { JFrame f = new JFrame(); f.setBounds(0, 0, 500, 400); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.setLayout(new FlowLayout()); f.add(new MyFirstPanel()); f.setVisible(true); } } class MyFirstPanel extends JPanel{ MyFirstPanel(){ setBackground(Color.GRAY); setPreferredSize(new Dimension(100, 100)); } }$

Output

We want to add a circle to the panel above

$public class OverridePaintDemo { public static void main(String[] args) { JFrame f = new JFrame(); f.setBounds(0, 0, 500, 400); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.setLayout(new FlowLayout()); f.add(new MyFirstPanel()); f.setVisible(true); } } class MyFirstPanel extends JPanel{ MyFirstPanel(){ setBackground(Color.GRAY); setPreferredSize(new Dimension(100, 100)); } public void paint(Graphics g) { super.paint(g); g.setColor(Color.RED); g.drawOval(5, 5, 90, 90); } }$

$Now we want to add a circle, a rectangle and a triangle public class OverridePaintDemo { public static void main(String[] args) { JFrame f = new Jframe(); f.setBounds(0, 0, 500, 400); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE ); f.setLayout(new FlowLayout()); f.add(new MyFirstPanel()); f.add(new MySecondPanel()); f.add(new MyThirdPanel()); f.setVisible(true); } } More code next..$

class MyFirstPanel extends JPanel{
MyFirstPanel(){
setBackground(Color.GRAY);
setPreferredSize(new Dimension(100, 100));
}

public void paint(Graphics g) {
super.paint(g);
g.setColor(Color.RED);
g.drawOval(5, 5, 90, 90);
}
}

class MySecondPanel extends JPanel{
MySecondPanel(){
setBackground(Color.GRAY);
setPreferredSize(new Dimension(100, 100));
}

public void paint(Graphics g) {
super.paint(g);
g.setColor(Color.RED);
g.drawRect(10, 15, 80, 60);
}
}

More code next..

class MyThirdPanel extends JPanel{
MyThirdPanel(){
setBackground(Color.GRAY);
setPreferredSize(new Dimension(100, 100));
}

public void paint(Graphics g) {
super.paint(g);
g.setColor(Color.RED);
g.drawLine(10, 90, 90, 90);
g.drawLine(10, 90, 90, 10);
g.drawLine(90, 10, 90, 90);
}
}

More on overriding
public class OverrideMethodDemo {

public static void main(String[] args) {
System.out.println("CGPA by class I: " + new I().getCgpa());
System.out.println("CGPA by class J: " + new J().getCgpa());
}
}

class I{
int[] gpas = new int[]{3, 4, 2, 4, 5};

int calculateSum(){
int sum = 0;
for (int i=0; i<gpas.length; i++)
sum += gpas[i];
return sum;
}

public float getCgpa(){
int sum = calculateSum();
return sum/gpas.length;
}
}

class J extends I{

public float getCgpa() {
int sum = calculateSum();
return (float)sum / (float)gpas.length;
}
}

Output
CGPA by class I: 3.0
CGPA by class J: 3.6

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import java.awt.Color;import java.awt.Insets;import java.awt.Con.pdfvenkt12345

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Import java.awt.; Import acm.program.; Import acm.graphics.;.pdfapexcomputer54

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Oop lecture9

1. Lecture 9 More on implementing Listeners Object Oriented Programming Eastern University, Dhaka Md. Raihan Kibria

2. Add a combo box We will add an item change listener and print to console. See next page for code

3. public class ComboDemo extends JFrame { ComboDemo(){ super.setBounds(0, 0, 500, 400); super.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); super.setLayout(new FlowLayout()); final JTextField text = new JTextField("Select an item"); class MyItemListener implements ItemListener{ JComboBox combo; MyItemListener(JComboBox combo){ this.combo = combo; } public void itemStateChanged(ItemEvent e) { text.setText(combo.getSelectedItem().toString()); } } JComboBox combo = new JComboBox(new String[]{"Square", "Circle", "Triangle"}); combo.addItemListener(new MyItemListener(combo)); super.add(combo); super.add(text); super.setVisible(true); } public static void main(String[] args){ new ComboDemo(); } }

4. Output

5. Overriding paint method of Component public class OverridePaintDemo { public static void main(String[] args) { JFrame f = new JFrame(); f.setBounds(0, 0, 500, 400); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.setLayout(new FlowLayout()); f.add(new MyFirstPanel()); f.setVisible(true); } } class MyFirstPanel extends JPanel{ MyFirstPanel(){ setBackground(Color.GRAY); setPreferredSize(new Dimension(100, 100)); } }

6. Output We want to add a circle to the panel above

7. public class OverridePaintDemo { public static void main(String[] args) { JFrame f = new JFrame(); f.setBounds(0, 0, 500, 400); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.setLayout(new FlowLayout()); f.add(new MyFirstPanel()); f.setVisible(true); } } class MyFirstPanel extends JPanel{ MyFirstPanel(){ setBackground(Color.GRAY); setPreferredSize(new Dimension(100, 100)); } public void paint(Graphics g) { super.paint(g); g.setColor(Color.RED); g.drawOval(5, 5, 90, 90); } }

8. Output

9. Now we want to add a circle, a rectangle and a triangle public class OverridePaintDemo { public static void main(String[] args) { JFrame f = new Jframe(); f.setBounds(0, 0, 500, 400); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE ); f.setLayout(new FlowLayout()); f.add(new MyFirstPanel()); f.add(new MySecondPanel()); f.add(new MyThirdPanel()); f.setVisible(true); } } More code next..

10. class MyFirstPanel extends JPanel{ MyFirstPanel(){ setBackground(Color.GRAY); setPreferredSize(new Dimension(100, 100)); } public void paint(Graphics g) { super.paint(g); g.setColor(Color.RED); g.drawOval(5, 5, 90, 90); } } class MySecondPanel extends JPanel{ MySecondPanel(){ setBackground(Color.GRAY); setPreferredSize(new Dimension(100, 100)); } public void paint(Graphics g) { super.paint(g); g.setColor(Color.RED); g.drawRect(10, 15, 80, 60); } } More code next..

11. class MyThirdPanel extends JPanel{ MyThirdPanel(){ setBackground(Color.GRAY); setPreferredSize(new Dimension(100, 100)); } public void paint(Graphics g) { super.paint(g); g.setColor(Color.RED); g.drawLine(10, 90, 90, 90); g.drawLine(10, 90, 90, 10); g.drawLine(90, 10, 90, 90); } }

13. More on overriding public class OverrideMethodDemo { public static void main(String[] args) { System.out.println("CGPA by class I: " + new I().getCgpa()); System.out.println("CGPA by class J: " + new J().getCgpa()); } }

14. class I{ int[] gpas = new int[]{3, 4, 2, 4, 5}; int calculateSum(){ int sum = 0; for (int i=0; i<gpas.length; i++) sum += gpas[i]; return sum; } public float getCgpa(){ int sum = calculateSum(); return sum/gpas.length; } } class J extends I{ public float getCgpa() { int sum = calculateSum(); return (float)sum / (float)gpas.length; } }

15. Output CGPA by class I: 3.0 CGPA by class J: 3.6

Oop lecture9

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