Handling Labels, Textfields, Buttons

 

import java.awt.*;

import javax.swing.*;

import javax.swing.JFrame;

import java.awt.event.*;

import javax.swing.event.*;

public class Lab2 extends JFrame implements ActionListener

{

JLabel l1,l2,l3,l;

JTextField t1,t2;

JTextArea ta,ta1;

JButton b;

Lab2()

        {

        super("Student Form");

        l=new JLabel("Student Details");

        l1=new JLabel("Enter Number:");

        l2=new JLabel("Enter Total Marks:");

        l3=new JLabel("Enter Address:");

        t1=new JTextField(20); 

        t2=new JTextField(20);

        ta=new JTextArea("",20,20);

        ta1=new JTextArea("",20,20);

        b=new JButton("Result");

        setSize(410,450);

        setResizable(false);

        setLayout(null);

        add(l).setBounds(80,1,150,50);

        add(l1).setBounds(10,60,150,20); 

        add(t1).setBounds(150,60,200,20);

        add(l2).setBounds(10,90,150,20); 

           

        add(t2).setBounds(150,90,200,20);

        add(l3).setBounds(10,110,150,20);

        add(ta1).setBounds(150,130,200,100);

        add(b).setBounds(150,250,120,20);

        add(ta).setBounds(150,300,200,100);

        b.addActionListener(this);

 

         addWindowListener(new WindowAdapter(){

                        public void windowClosing(WindowEvent e)

                        {

                                    System.exit(0);

                        }

            });

         }

        public void actionPerformed(ActionEvent e)

        {

            if(e.getSource()==b)

            if ( Integer.parseInt(t2.getText()) <100 )

            ta.insert("Below Average",0);

else if( Integer.parseInt(t2.getText()) >=100 && Integer.parseInt(t2.getText()) <=300)

            ta.insert("Average",0);

           

else if( Integer.parseInt(t2.getText()) >=500 && Integer.parseInt(t2.getText()) <=1000)

            ta.insert("Good",0);

                    }

public static void main(String str[])

        {

        Lab2 l=new Lab2();

        l.setVisible(true);

        }

}

Output: