https://github.com/anower77/java
Basic Java
https://github.com/anower77/java
Last synced: about 2 months ago
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Basic Java
- Host: GitHub
- URL: https://github.com/anower77/java
- Owner: Anower77
- Created: 2023-07-31T16:04:15.000Z (almost 3 years ago)
- Default Branch: main
- Last Pushed: 2023-08-01T06:22:57.000Z (almost 3 years ago)
- Last Synced: 2025-12-30T16:42:39.540Z (5 months ago)
- Language: Java
- Size: 9.77 KB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
### Basic JAVA
---
### String Input
```java
import java.util.Scanner;
public class stringConcept{
public static void main(String[] args){
// input keywords declaration
Scanner input = new Scanner(System.in);
// variable declaration
String name;
System.out.print("Enter your name : ");//optional sta!
name = input.nextLine();
System.out.print("Okay! Welcome, " + name);
}
}
```
### Sub-String
___
```java
class substring{
public static void main(String[] args){
String name = "Anower and Hossain";
System.out.println(name.substring(7, 11));
}
}
```
### Input
___
```java
// import files
import java.util.Scanner;
public class input{
public static void main(String[] args){
// input keywords
Scanner inputs = new Scanner(System.in);
int number;
// show number statement
System.out.print("Enter integers number : ");
number = inputs.nextInt();
System.out.println("Number = " + number);
}
}
```
### Function
___
```java
// method and function
class function{
// function-1
public static void printJava(){
System.out.println("Java==java");
}
// function-2
public static void prnitName(String name){
System.out.println(name);
}
// function-3
public static void printSum(int a, int b){
int sum = a + b;
System.out.println("Addition = " +sum);
}
public static void main(String[] args){
// function-1 call
printJava();
printJava();
printJava();
// function-2
prnitName("Anwoer hossain");
prnitName("Mahamudul Islam");
prnitName("Shahadat hossain");
// function=3
printSum(10, 20);
printSum(20, 20);
printSum(40, 50);
}
}
```
### Exception
___
```java
class exception{
public static void main(String[] args) {
// Try - catch Exception Handling
int marks[] = {97, 98, 92};
try{
System.out.println(marks[5]);
}catch(Exception exception){
// do somethind after catching
}
System.out.println("The name is anower");
}
}
```
### Loop (For, While, Do-While)
___
```java
class loop{
public static void main(String[] args) {
// looop statment -- for, while, do-while
// for loop
for(int i = 100; i >= 1; i--){
System.out.println(i);
}
//while loop
int j = 100;
while(j >= 1){
System.out.println(j);
j--;
}
//do-while
int k = 100;
do{
System.out.println(k);
k--;
}while(k >= 1);
}
}
```
### In-Loop
___
```java
//take a input run loop statment
import java.util.Scanner;
class inLoop{
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int number = 0;
do{
System.out.print("Enter any Number : ");
number = sc.nextInt();
System.out.print("Here is your Numer = ");
System.out.println(number);
}while(number >= 0);
// if you press negative number then show stt..
System.out.print("THE NUMBER!");
}
}
```
### Conditional
___
```java
class conditional{
public static void main(String[] args){
boolean isSunUp = false;
if(isSunUp == true)
System.out.println("day");
else
System.out.println("night");
}
}
```
### Prime Function
___
```java
// print name using function
import java.util.*;
class printnamefunc{
// function
public static void printName(String name){
System.out.println(name);
return;
}
public static void main(String[] args){
Scanner sc = new Scanner(System.in);
System.out.print("Enter your name : ");
String name = sc.nextLine();
printName("Welcome..." + name);
}
}
```
### Repleace
___
```java
class repleace{
public static void main(String[] args){
String name = "Anower";
String name2 = name.replace('e', 'E');
System.out.println(name2);
System.out.print(name);
}
}
```
### Summation Function
___
```java
// calculate sum
import java.util.*;
class sumfunc{
public static int calculateSum(int a, int b){
int sum = a + b;
System.out.print(sum);
return 1;
}
// main
public static void main(String[] args){
Scanner sc = new Scanner(System.in);
System.out.print("Enter a value : ");
int a = sc.nextInt();
System.out.print("Enter b value : ");
int b = sc.nextInt();
System.out.print("Summation : ");
calculateSum(a, b);
}
}
```
### Switch
___
```java
class switch1{
public static void main(String[] args) {
// conditional statment -- switch
int day = 4;
switch (day) {
case 1:
System.out.println("Sat");
break;
case 2:
System.out.println("Sun");
break;
default:
System.out.println("Mon - wed");
}
}
}
```
### Triangle
___
```java
import java.util.Scanner;
class Triangle{
public static void main(String[] args){
Scanner input = new Scanner(System.in);
double base, height, area;
System.out.print("Enter base : ");
base = input.nextDouble();
System.out.print("Enter height : ");
height = input.nextDouble();
//triangle formula
area = (0.5)* base * height;
System.out.println("Area = " + area);
}
}
```
### Factorial
___
```java
// print name using function
import java.util.*;
class printnamefunc{
// function
public static void printFactorial(int n){
if(n < 0){
System.out.println("Invalid Number!");
return;
}
int factorial = 1;
for (int i = n; i >= 1; i--){
factorial = factorial * i;
}
System.out.println(factorial);
return;
}
public static void main(String[] args){
Scanner sc = new Scanner(System.in);
System.out.print("Enter any number : ");
int n = sc.nextInt();
System.out.print("total factorial = ");
printFactorial(n);
}
}
```
### Array
___
```java
import java.util.Arrays;
class array2d{
public static void main(String[] args){
int[][] finalMarks = {{90, 89, 70}, {90, 99, 80}};
System.out.println(finalMarks[0][1]);
}
}
```
### Circle
___
```java
import java.util.Scanner;
class circleArea{
public static void main(String[] args){
Scanner input = new Scanner(System.in);
double area, radius, pi;
pi = 3.1416;
System.out.print("Enter radius : ");
radius = input.nextDouble();
// circle formula
area = pi * (radius * radius);
System.out.println("Circle area = " + area);
}
}
```
### Casting
___
```java
class array2d{
public static void main(String[] args){
double price = 100.00;
double totalPrice = price + 18;
System.out.println(totalPrice);
// wrong methods
int price1 = 100;
int totalPrice1 = price1 + (int)18.00;
System.out.println(totalPrice1);
}
}
```
### IF-else
___
```java
import java.util.Scanner;
class ifelsestatement{
public static void main(String[] args){
Scanner input = new Scanner(System.in);
int num;
System.out.print("Enter any number : ");
num = input.nextInt();
// if else
if(num > 0 ){
System.out.print("Positive Number");
}else if(num < 0 ){
System.out.print("Nagetive Number");
}else{
System.out.print("Zero");
}
}
}
```
### Double Concept
___
```java
class array2d{
public static void main(String[] args){
double price = 100.00;
double totalPrice = price + 18;
System.out.println(totalPrice);
// wrong methods
int price1 = 100;
int totalPrice1 = price1 + (int)18.00;
System.out.println(totalPrice1);
}
}
```
### Circle Area
___
```java
import java.util.Scanner;
class circleArea{
public static void main(String[] args){
Scanner input = new Scanner(System.in);
double area, radius, pi;
pi = 3.1416;
System.out.print("Enter radius : ");
radius = input.nextDouble();
// circle formula
area = pi * (radius * radius);
System.out.println("Circle area = " + area);
}
}
```
### Assignment-01
___
```java
class assignment {
public static void main(String[] args){
System.out.println("ID: 12093");
System.out.println("Description: something like that!");
System.out.println("Laptop: lanovo");
System.out.println("Price: 2394K");
}
}
```
### Assignment-02
___
```java
class assignment2{
public static void main(String[] args){
int a = 29393;
double d = 23.2;
short s = 329;
int i = 5;
float f = 5.99f;
char c = 'D';
boolean b = true;
System.out.println("double = " + d);
System.out.println("short = " + s);
System.out.println("int = " + i);
System.out.println("float = " + f);
System.out.println("char = " + c);
System.out.println("boolean = " + b);
}
}
```
### Assignment-03
___
```java
// package beginnerjava.beginnerjava;
import java.util.Scanner;
public class assignment3 {
public static void main(String[] args) {
// Variable Declaration
int id,price;
String title,description,category;
// Input the values from the users
// For ID
Scanner idIn = new Scanner(System.in);
System.out.print("Enter the id : ");
id = idIn.nextInt();
// For TIltle
Scanner titleIn = new Scanner(System.in);
System.out.print("Enter the title : ");
title = titleIn.nextLine();
// For Price
Scanner priceIn = new Scanner(System.in);
System.out.print("Enter the price(USD) : ");
price = priceIn.nextInt();
// For Description
Scanner descriptionIn = new Scanner(System.in);
System.out.print("Enter the description : ");
description = descriptionIn.nextLine();
// For Category
Scanner categoryIn = new Scanner(System.in);
System.out.print("Enter the category : ");
category = categoryIn.nextLine();
// Print the values
System.out.println("\n\n"+"The value input by the users are given below : ");
System.out.println("================================================");
System.out.println("id : "+id);
System.out.println("title : "+title);
System.out.println("price(USD) : "+price);
System.out.println("description : "+description);
System.out.println("category : "+category);
}
}
```
### Assignment-04
___
```java
import java.util.Scanner;
// Create a program to calculate installment amount for per month
public class Assignment4 {
public static void main(String[] args) {
try (Scanner input = new Scanner(System.in)) {
int phonePrice = 1800; // 1800 euros
int numberOfInstallment, installmentPerMonth;
System.out.println("Number of installments? ");
// get number of installments from user
System.out.print("Enter numberOfInstallment : ");
numberOfInstallment = input.nextInt();
installmentPerMonth = phonePrice / numberOfInstallment;
// calculate installment amount for per month
System.out.println("Monthly installment Amount: "+installmentPerMonth + " euros");
}
}
}
```
### Assignment-05
___
```java
import java.util.Scanner;
class Assignment5{
public static void main(String[] args){
Scanner input = new Scanner(System.in);
int age;
System.out.print("Enter you age : ");
age = input.nextInt();
System.out.print("your age : " + age);
// if statement
if(age > 18){
System.out.print(" you are voter and you can vote!");
}else if(age < 18){
System.out.print(" you are under 18, you can't vote");
}else{
System.out.print(" Invalid Ages!");
}
}
}
```