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@MananAmin
Created September 8, 2021 16:22
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package com.learn;
import java.util.Arrays;
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
System.out.println("Hello World");
// variables
String name = "Manan";
// primitive type
int number = 007;
double pi = 3.14;
long phone = 7359251716L;
byte temp = 127;
float pi2 = 3.142F;
char c = 'a';
boolean flag = true;
// new keyword
String str = new String("Hello guys");
//Strings
String str1 = "lost";
String str2 = "boy";
String con_str = str1 + str2;
System.out.println(con_str.charAt(4));
String str3 = str1.replace('a','b');
String sub = str1.substring(0,4);
System.out.println(sub);
// Arrays
int len = 100;
int[] array = new int[len];
boolean[] bool_array = new boolean[len];
int length = array.length;
//sort array
Arrays.sort(array);
int[][] matrix= new int[len][len];
// casting
double price = 100.50;
double final_price = price - 10; // Example of implicit casting
int cost = 100;
int final_cost = cost - (int)18.9; // Explicit casting
// Constants
final float PI = 3.14F;
//Operators
int val1 = 100;
int val2 = 50;
int sum = val1 + val2 - (int)PI;
int mod = val1 % val2;
boolean antiflag = !flag;
sum++;
--sum;
// Math class
Math.max(val1,val2);
double ran = 100*Math.random();
//input
Scanner sc = new Scanner(System.in);
// int num = sc.nextInt();
// String name2 = sc.next(); // input until space
// String line = sc.nextLine(); // Inute line
// comparison operators
boolean is_eq = val1 ==val2;
// Condition statements
if(val1 > val2){
System.out.println("Val1 is large");
}
else {
System.out.println("Val2 is large");
}
// logical operators
if(name=="Manan" &&val1 > 18){
System.out.println("okay ");
}
// switch
int day = 1;
switch(day){
case 1 :
System.out.println("Monday");
case 2:
System.out.println("Tuesday");
break;
default:
System.out.println("Holiday");
}
// loops
for(int i =0 ; i < array.length ;i++){
System.out.println(i);
if(i==37){
continue;
}
}
int fl = 30;
while(fl>0){
System.out.println(fl);
fl--;
}
int k =1;
do{
System.out.println("Enter Even number");
k = sc.nextInt();
}while(!isEven(k));
// exception handling
try{
System.out.println(array[1000]);
}catch(Exception ex){
System.out.println("Inside Exception "+ ex);
}
}
// function
public static boolean isEven(int number){
if(number % 2==1)
return false;
return true;
}
}
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