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Java For Loop Programs

In this tutorial, we will learn how to implement a for loop in different scenarios. But before moving further, if you are not familiar with the concept of for loop, then do check the article on Loops in Java.

Program 1: Java For Loop Program

In this program, we will see how to implement for loop program in java. Here, we will consider a scenario where we will find the multiplication table of a particular number. Instead of writing the multiplication table for each element, we will use a for loop for the same. We will write the statement once and it will be implemented multiple times.

Algorithm:

  1. Start
  2. Create an instance of the Scanner class.
  3. Declare a number
  4. Ask the user to initialize the number.
  5. Use a for loop to print the multiplication table of that number.
  6. Display the result.
  7. Stop.

Below is the code example of for loop in Java.

//Java Program to find the multiplication table of a given number
import java.util.*;

public class Main
{
     public static void main(String []args)
     {
        //Take input from the user
        //Create instance of the Scanner Class
        Scanner sc=new Scanner(System.in); 
        System.out.println("Enter a number: ");
        int n=sc.nextInt();      //Declare and initialize the number
        System.out.println("The multiplication table of "+n+" is: ");
        //Print the multiplication table
        for(int i=1;i<=10;i++)
        {
            System.out.println(n+" * "+i+" = "+ (n*i));
        }
     }
}


Enter a number: 5
The multiplication table of 5 is:
5 * 1 = 5
5 * 2 = 10
5 * 3 = 15
5 * 4 = 20
5 * 5 = 25
5 * 6 = 30
5 * 7 = 35
5 * 8 = 40
5 * 9 = 45
5 * 10 = 50

Program 2: Java For Loop Program

In this program, we will see how to implement a for each loop program in java.

Algorithm

  1. Start
  2. Create an instance of the Scanner class.
  3. Declare the array size.
  4. Ask the user to initialize the array size.
  5. Declare an array.
  6. Ask the user to initialize the array.
  7. Use a for loop to initialize the array.
  8. Use a for each loop to print the array elements.
  9. Print the array elements.
  10. Stop.

Below is the code example of for loop in Java.

//Java Program to see the implementation of for and for-each loop
import java.util.*;

public class Main
{
     public static void main(String []args)
     {
        //Take input from the user
        //Create instance of the Scanner Class
        Scanner sc=new Scanner(System.in); 
        System.out.println("Enter the size of the array: ");
        int n=sc.nextInt();      //Declare and initialize the number
        int arr[]=new int[n];    //Declare an Array
        System.out.println("Enter the array elements: ");
        //Initialize the array        
        for(int i=0; i<n; i++)
        {
            arr[i]=sc.nextInt();
        }
        System.out.println("The array elements are: ");
        //Print the number infinite times
        for(int t:arr)
        {
            System.out.println(t);
        }
     }
}


Enter the size of the array: 5
Enter the array elements: 1 2 3 4 5
The array elements are:
1
2
3
4
5

Program 3: Java Program to Implement For Loop

In this program, we will see how to implement an infinite for loop. A point to be noted here is that, in order to exit from an infinite loop, you need to press ctrl+c.

Algorithm:

  1. Start
  2. Create an instance of the Scanner class.
  3. Declare a number.
  4. Ask the user to initialize the number.
  5. Print the number infinite times using a for loop.
  6. Give infinite conditions in the for loop.
  7. Display the result.
  8. Stop.
Below is the java code example for the for loop.
//Java Program to see the implementation of infinite for loop
import java.util.*;
public class Main
{
     public static void main(String []args)
     {
        //Take input from the user
        //Create instance of the Scanner Class
        Scanner sc=new Scanner(System.in); 
        System.out.println("Enter a number: ");
        int n=sc.nextInt();      //Declare and initialize the number
        //Print the number infinite times
        for(int i=1;i<=10;i--)
        {
            System.out.println(i + " The entered number is "+n);
        }
     }


Enter a number: 5
1 The entered number is 5
0 The entered number is 5
-1 The entered number is 5
-2 The entered number is 5
-3 The entered number is 5
-4 The entered number is 5
ctrl+c

Program 4:Java Program to Implement For Loop

In this program, we will see how to print a number infinite times using a for loop. A point to be noted here is that, in order to exit from an infinite loop, you need to press ctrl+c.

Algorithm:

  1. Start
  2. Create an instance of the Scanner class.
  3. Declare a number.
  4. Ask the user to initialize the number.
  5. Print the number infinite times using a for loop.
  6. Give infinite conditions in the for loop.
  7. Display the result.
  8. Stop.
Below is the code for the same.
//Java Program to see the implementation of infinite for loop
import java.util.*;

public class Main
{
     public static void main(String []args)
     {
        //Take input from the user
        //Create instance of the Scanner Class
        Scanner sc=new Scanner(System.in); 
        System.out.println("Enter the number: ");
        int n=sc.nextInt();      //Declare and initialize the number
        //Infinite Loop Example      
        for(; ;)
        {
            System.out.println("Number is "+n);
        }
        
     }
}


Enter the number: 3
Number is 3
Number is 3
Number is 3
Number is 3
Number is 3
Number is 3
Number is 3
Number is 3
Number is 3
ctrl+c