Java anonymous inner class 🎭
Автор: Bro Code
Загружено: 2020-06-13
Просмотров: 36670
Java anonymous inner class tutorial
#java #anonymous #class
public class Main {
public static void main(String[] args) {
/*anonymous class = an inner class without a name
only a single object is created from one
The object may have “extras” or "changes"
and no need to create a separate innerclass
when it only need it once.
Helps us to avoid cluttering code with a class name
Syntax is similar to a constructor,
except that there is also a class definition
within a block of code.
GREAT FOR LISTENERS
*/
MyFrame myFrame = new MyFrame();
}
}
import java.awt.event.*;
import javax.swing.*;
public class MyFrame extends JFrame{
JButton button1 = new JButton("Button #1");
JButton button2 = new JButton("Button #2");
JButton button3 = new JButton("Button #3");
MyFrame(){
button1.setBounds(100,100,100,100);
button2.setBounds(200,100,100,100);
button3.setBounds(300,100,100,100);
button1.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
System.out.println("You pressed button #1");
}
});
button2.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
System.out.println("You pressed button #2");
}
});
button3.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
System.out.println("You pressed button #3");
}
});
this.add(button1);
this.add(button2);
this.add(button3);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setSize(500, 500);
this.setLayout(null);
this.setVisible(true);
}
}
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