uk19

mport java.io.;
public class Main {
static BufferedReader sc = new BufferedReader(new
InputStreamReader(System.in));
static int a[][] = new int[5][5];
public static void main(String[] args) throws NumberFormatException,
IOException {
int m = 0, n = 0;
System.out.print("Enter number of rows ");
m = Integer.parseInt(sc.readLine());
System.out.print("Enter number of columns ");
n = Integer.parseInt(sc.readLine());
if (m == n) {
int i, j;
System.out.println("Enter values for matrix: ");
for (i = 0; i < m; i++) {
for (j = 0; j < n; j++) {
a[i][j] = Integer.parseInt(sc.readLine());
}
}
System.out.println("Orignal Matrix :");
for (i = 0; i < m; i++) {
for (j = 0; j < n; j++) {
System.out.print("[" + a[i][j] + "]");
}
System.out.println("");
}
// Calculate and display the sum of the diagonal elements
int sum = 0;
for (i = 0; i < m; i++) {
sum += a[i][i];
}
System.out.println("Sum of diagonal elements: " + sum);
} else {
System.out.println("Rows not equal to columns");
}
}
}
Q2)
import java.awt.;
import javax.swing.;
import java.awt.event.;
class ComboBoxExample
{
JFrame f;
JTextField t1;
ComboBoxExample()
{
f=new JFrame("ComboBox Example");
final JLabel label = new JLabel();
t1=new JTextField(10);
label.setHorizontalAlignment(JLabel.CENTER);
label.setSize(400,100);
JButton b=new JButton("Show");
b.setBounds(200,100,75,20);
String languages[]={"C","C++","C#","Java","PHP"};
final JComboBox cb=new JComboBox(languages);
cb.setBounds(50, 100,90,20);
f.add(cb); f.add(label); f.add(b);
f.add(t1);
f.setLayout(new FlowLayout());
f.setSize(350,350);
f.setVisible(true);
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String data = "Programming language Selected: " +
cb.getItemAt(cb.getSelectedIndex());
t1.setText(data);
}
});
}
public static void main(String[] args)
{
new ComboBoxExample();
}
}