Java End Term: 3 April 2022, Set AN1 (January 2022 term)

1import java.io.*;
2import java.util.*;
3
4public class FClass{
5    static boolean writeToFile(String filename) {
6        try {
7            FileOutputStream fos = new FileOutputStream(filename);
8            PrintStream bos = new PrintStream(fos);
9            bos.println("2 numbers are");
10            bos.println("3.14 and");
11            bos.println("10");
12            return true;
13        }catch(IOException e) {
14            return false;
15        }
16    }
17    static boolean readFromFile(String filename) {
18        try {
19            FileInputStream fis = new FileInputStream(filename);
20            Scanner sc = new Scanner(fis);
21            System.out.println(sc.nextInt());
22            System.out.println(sc.nextLine());
23            System.out.println(sc.nextDouble());
24            System.out.println(sc.nextLine());
25            return true;
26        }catch(IOException e) {
27            return false;
28        }
29    }
30    public static void main(String[] args) throws IOException{
31        if(writeToFile("E:\\myfile.txt") == false)
32            System.out.println("write failed");
33        if(readFromFile("E:\\myfile.txt") == false)
34            System.out.println("read failed");
35    }
36}

1import javax.swing.*;
2import java.awt.*;
3import java.awt.event.*;
4public class FClass extends JFrame implements ActionListener{
5    JCheckBox cbColor;
6    JPanel pnlColor, pnlBtn;
7    public FClass(){
8        setSize(200, 200);
9        cbColor = new JCheckBox("Red Panel");
10        cbColor.addActionListener(this);
11        pnlColor = new JPanel();
12        pnlBtn = new JPanel();
13        pnlBtn.add(cbColor);
14        add(pnlBtn, "South");
15        add(pnlColor, "Center");
16        pnlColor.setBackground(Color.blue);
17        setVisible(true);
18    }
19    public void actionPerformed(ActionEvent e) {
20        /*--------------------*/
21        /*****CODE SEGMENT*****/
22        /*--------------------*/
23    }
24    public static void main(String[] args){
25        new FClass();
26    }
27}

1class Employee{
2    String name;
3    int salary;
4    public Employee(String n, int s){
5        name = n;
6        salary = s;
7    }
8    public Employee(Employee e){
9        this.name = e.name;
10        this.salary = e.salary;
11    }
12    public double bonus(){
13        return salary * 0.1;
14    }
15}
16public class Test {
17    public static void main(String[] args) {
18        Employee e1 = new Employee("raju",12000);
19        var e2 = new Employee(e1);
20        e2.salary = 10000;
21        System.out.println(e1.bonus());
22        System.out.println(e2.bonus());
23    }
24}