Java Programs


 If-else Example

import java.util.Scanner;
public class Grading {
    public static void main(String[] args) {
        // Getting input
        System.out.print("Enter your mark : ");
        Scanner sc = new Scanner(System.in);
        int mark = sc.nextInt();
        char grade;
        if(mark>=90){
            grade = 'A';
        }else if(mark>=80){
            grade = 'B';
        }else if(mark>=70){
            grade = 'C';
        }else if(mark>=60){
            grade = 'D';
        }else if(mark>=50){
            grade = 'E';
        }else{
            grade = 'F';
        }
        System.out.println("Your grade is "+grade);
    }
}

In Simple company, transport of company is based on weight and kilometres. Get the weight and kilometres and calculate cost as Rs.10 per kg for each kilometer. Give discount of 10% for cost greater than 1000, 5% for cost greater than 500


import java.util.Scanner;

class HelloWorld {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        float weight; float kms;
        float cost; float discount = 0;
       
        System.out.print("Enter the total weight : ");
        weight = sc.nextFloat();
        System.out.print("Enter the total distance : ");
        kms = sc.nextFloat();
       
        cost = 10 * weight * kms;
       
        if(cost> 1000){
            discount = cost * 0.10f;
            cost -= discount;
        }else if(cost > 500){
              discount = cost * 0.05f;
            cost -= discount;
        }
       
        System.out.println("Original Price : "+(cost+discount));
        System.out.println("Discount : "+discount);
        System.out.println("Cost : "+cost);
       
       
    }
}

Simple User info Printing Screen

import java.util.Scanner;
public class userinfo {
   public static void main(String[] args) {
    String name;
    Long mobileNo;
    Character initial;
    Float cgpa;
    Scanner sc = new Scanner(System.in);
    System.out.println("Enter your name without initial : ");
    name = sc.nextLine();
    System.out.println("Enter your Initial(one word) : ");
    initial = sc.nextLine().charAt(0);
    System.out.println("Enter your mobile number : ");
    mobileNo = sc.nextLong();
    System.out.println("Enter yout cgpa : ");
    cgpa = sc.nextFloat();

    System.out.println("------------------------------------");
    System.out.println("\tYour Details");
    System.out.println("------------------------------------");
    System.out.println("Your name without initial : "+name);
    System.out.println("Your Initial(one word) : "+initial);
    System.out.println("Your mobile number : "+mobileNo);
    System.out.println("Yout cgpa : "+cgpa);

   }
 
}

Simple Switch Case Example

// Online Java Compiler
// Use this editor to write, compile and run your Java code online
import java.util.Scanner;

class HelloWorld {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
float num1, num2, ans;
System.out.println("Enter the number 1");
num1 = sc.nextInt();
System.out.println("Enter the number 2");
num2 = sc.nextInt();
System.out.println("1.Division \n2.Remainder");
System.out.println("Enter your option : ");
int option = sc.nextInt();
switch(option){
case 1:
ans = num1/num2;
System.out.println(num1+" divided by"+num2+" = "+ans);
break;
case 2:
ans = num1%num2;
System.out.println("Remainder of "+num1+" divided by "+num2+" = "+ans);
break;
default:
System.out.println("Not a valid choice");
}

}
}

Loops in java

// Online Java Compiler
// Use this editor to write, compile and run your Java code online

class HelloWorld {
public static void main(String[] args) {
int i = 1;
// while loop
while(i<10){
System.out.println(i);
i++;
}
i = 10;
// do while loop
do {
System.out.println(i);
i++;
}while(i<10);
// for loop
for (i = 1; i<10; i+=2){
System.out.println(i);
}
}
}

Find sum of all the numbers divisible by 3 between 1 to 30

// Online Java Compiler
// Use this editor to write, compile and run your Java code online

class HelloWorld {
public static void main(String[] args) {
int sum = 0;
for (int i = 3; i<=30; i+=3){
sum+=i;
}
System.out.println("The Sum of all numbers divisible by 3 between 1-30 is "+sum);
}
}


class HelloWorld {
public static void main(String[] args) {
int sum = 0;
int i = 1;
while (i<=30)
{
if (i%3==0){
sum = sum+i;
}
i++;
}
System.out.println("The Sum of all numbers divisible by 3 between 1-30 is "+sum);
}
}



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