Question

Write Java code which will create a GUI window on screen. The window has one button: Doggy. When the user selects Doggy, “Bow Bow” should be printed on screen. Justify your syntax. ASAP

Answer 1

Code:

import java.awt.;       //this package is used to create gui and components in java
import java.awt.event.; //this used to handle events from components
class Main extends Frame implements ActionListener{  //extend frame class to create window and addActionListener interface to handle events
    Label l;    //create lable object to display message on click
    Button b;   //create button for click event
    Main(){     //constructor of class to initialize components 
        b=new Button("Doggy");   //initialize button with text Doggy
        b.setBounds(175,150,60,30); //it used to specify where button should display
        l=new Label();           //initialize lable 
        l.setBounds(180,200, 60,30);//it used to specify where label should display
        b.addActionListener(this);  //when button is clicked then actionPerformed method called automatically because we handled button event    
        l.setForeground(Color.RED);  //set color of label text to red
                add(b);      //add button to the frame
        add(l);      //add Label to the frame
        setSize(400,400);   //specify size(height,width) of frame 
        setLayout(null);    
        setVisible(true);   //here it used to visible frame to screen
    }  
    public void actionPerformed(ActionEvent e) {  //when button clicked event is handles here
        try{    
          l.setText("Bow Bow");  //it sets this message to the label
        }
        catch(Exception ex)
        {System.out.println(ex);}  
    }  
    public static void main(String[] args) {  
        new Main();    //create object of main class 
    }  
}

Save file with Main.java
Then compile javac Main.java
Then run java Main

Output:

After Doggy button clicked: