Now Starting regular Codes Of Java
You Want To practice these Codes in Regular basis

// #3 Arrays in Java

public class MyClass {
public static void main(String args[]) {

int arr[] = {2, 3, 6};
//Array declaration and initialization

System.out.println(arr[0]);
//Showing Array First element

}
}

//#4 Declaring & iniitializing Array

public class MyClass {
public static void main(String args[]) {

int arr[]; //declaring array
arr = new int[20]; // allocating memory

arr[0]= 55; //iniitializing first element
arr[1]= 33; //initi.... 2nd Element
System.out.println(arr[0]);
}
}

// #5 Atithmetic Operations in Java

public class MyClass {
public static void main(String args[]) {

// declaring variables
int add, sub, div, mul, rem;

// Declaring two varables
int x=4;
int y=2;

// performing Operations
add = x+y; // Addition
sub = x-y; // Subtraction
div = x/y; // Division
mul = x+y; // Multiply
rem= x%y; // reminder

// Showing results
System.out.println("4 + 2 = "+ add);
System.out.println("4 - 2 = "+ sub);
System.out.println("4 * 2 = "+ mul);
System.out.println("4 / 2 = "+ div);
System.out.println("4 % 2 = "+ rem);
}
}

//#6 2 Number Adder(Calculator) from user input

// This for Scan anything entered by user (user inputs)
import java.util.Scanner;

class myClass {
public static void main(String[] args) {

int x,y,Sum;

Scanner s = new Scanner(System.in);
// it will take input from keyboard

System.out.println("Enter 1st Number: ");
x = s.nextInt(); // scanning

System.out.println("Enter 2nd Number: ");
y = s.nextInt(); // scanning

Sum = x+y;
System.out.println("Sum = "+ Sum);
}
}

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// Percentage Calculator in Java

import java.util.Scanner;

public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);

// #For_Taking_Total_Sub_and_Max_Marks
System.out.print("Total subjects: ");
int tsub = sc.nextInt();
System.out.print("\nMax Marks: ");
float mmark = sc.nextInt();
System.out.println("");

int [] arr = new int[tsub];

// #For_taking_Subject_values
for (int i =0; i< tsub;i++){
System.out.print("Enter Marks of "+(i+1)+": ");
arr[i] = sc.nextInt();
}

float percent, avg=0, iper;

// #For_Showing_Results_and_Percentage
for (int i =0; i< tsub;i++){
System.out.println("\nMarks of "+(i+1)+" is "+arr[i]);
iper = ((arr[i]/mmark)*100);
System.out.println("Percentage of "+(i+1)+" is "+ iper);
avg = avg + iper;
}

percent = avg/tsub;

System.out.println("\nTotal Percent: "+ percent+ "%");

}
} // @Java_Codes_Pro

//enum code for advance java

enum Day{
SUN("sunday"), MON("monday"), TUE("tuesday"), WED("wednesday"), THU("thursday"), FRI("friday"), SAT("saturday");
public String Valu;
Day(String valu){
this.Valu = valu;
}

public String getValue(){
return Valu;
}
}

public class Main {
public static void main(String[] args) {
Day d = Day.MON;
System.out.println("Enum name: " + d.name() + " Value is " + d.getValue());

for(Day e: Day.values()){
System.out.println(e.name() + " " +e.getValue());
}
}
} // @Java_Codes_pro

// Serialization - Deserialization Advance java concept

// Warning : for using this code change path of 'filename' (written below in Serializ class) to your file path

import java.io.*;

class Student implements Serializable {
private static final long serialVersionUID = 1L;

private String name;
private int age;
private String address;
// transient int x; if we create this then this will be no serialized

public Student(String name, int age, String address) {
this.name = name;
this.age = age;
this.address = address;
}

public void setName(String name) {
this.name = name;
}

public void setAge(int age) {
this.age = age;
}

public void setAddress(String address) {
this.address = address;
}

public String getName() {
return name;
}

public int getAge() {
return age;
}

public String getAddress() {
return address;
}

public String get(String z){
return z;
}

public int get(int age){
return age;
}

@Override
public String toString() {
return ("Student name is " + this.getName() + ", age is " + this.getAge() + ", and address is "
+ this.getAddress());
}
}

public class Serializ {
public static void main(String[] args) {
Student student = new Student("Sid", 19, "UP India");
FileOutputStream fileOut = null;
ObjectOutputStream objOut = null;
String filename = "C:\\Users\\mynms\\Desktop\\BCA\\Code\\Java2\\unit 4\\Test.txt";
// Serialization
try {
fileOut = new FileOutputStream(filename);
objOut = new ObjectOutputStream(fileOut);

objOut.writeObject(student);
objOut.close();
fileOut.close();

System.out.println("Object has been serialized: " + student);
} catch (Exception e) {
System.out.println("Not Serialized");
}

// Deserialization
FileInputStream fileIn = null;
ObjectInputStream objIn = null;

try {
fileIn = new FileInputStream(filename);
objIn = new ObjectInputStream(fileIn);

Student object = (Student) objIn.readObject();

System.out.println("Object has been deserialized " + object);

objIn.close();
fileIn.close();

} catch (IOException e) {
System.out.println("IO Exception " + e);
}
catch(ClassNotFoundException e){
System.out.println("Class not found exception " + e);
}
}
} // @Java_Codes_Pro