# Java Program to Print the Series 1, 12, 123, 1234, …, n

In the previous article, we have discussed about Java Program to Find the Sum of Series 1 + 1 / (1+2) + 1 / (1+2+3) + ……… + 1 / (1+2+3+ … + N)

In this article we are going to see how to print the series 1, 12, 123, 1234, …, n by using Java programming language. Additionally we include from the view of beginners 1 12 123 pattern in java, print 1 12 123 in java, How to print 1 12 123 in java, java program to print 1 12 123, Java program for pattern 1 12 123, 1 12 123 series in java, 1 12 123 pattern in java using for loop, wap to print 1 12 123, 1 12 123 1234 12345 Pattern In Java etc.

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## Java Program to Print the Series 1, 12, 123, 1234, …, n

On observing the pattern carefully, we can see each term starts from 1 and the last digit of the term is exact same as the nth term.

Example:

Suppose n = 5

Then series: 1, 12, 123, 1234, 12345

Let’s see different ways to print the series 1, 12, 123, 1234, …, n.

### Method-1: Java Program to Print the Series 1, 12, 123, 1234, …, n By Using For Loop

Approach:

• Declare an integer variable say ‘n’ which holds the value of Nth term.
• Create Scanner class object.
• Prompt the user to enter a number as value of n.
• Use a for loop from i=1 to i<=n (incremented by 1)
• Inside the for loop, we will again do a for loop from j=1 to j<=i (incremented by 1)
• Inside that loop we will print the value of j separated by comma.

Program:

import java.util.*;
public class Main
{
public static void main(String [] args)
{
//creating object of Scanner class
Scanner s = new Scanner(System.in);
//Taking input of number of elements in the series
System.out.println("Enter the value of 'n' ");
int n = s.nextInt();
//for loop to print the series
for (int i = 1; i <= n; i++)
{
for (int j = 1; j <= i; j++)
{
System.out.print(j);
}
System.out.print(", ");
}
}
}

Output:

Enter the value of 'n'
3
1, 12, 123,

### Method-2: Java Program to Print the Series 1, 12, 123, 1234, …, n By Using While Loop

Approach:

• Declare an integer variable say ‘n’ which holds the value of Nth term.
• Create Scanner class object.
• Prompt the user to enter a number as value of n.
• Use a while loop from i=1 to i<=n (incremented by 1)
• Inside the while loop, we will again continue a while loop from j=1 to j<=i (incremented by 1)
• Inside that loop we will print the value of j separated by comma.

Program:

import java.util.*;
public class Main
{
public static void main(String [] args)
{
//creating object of Scanner class
Scanner s = new Scanner(System.in);
//Taking input of number of elements in the series
System.out.println("Enter the value of 'n' ");
int n = s.nextInt();
// while loop to print the series
double sum = 0;
int i = 1;
while(i <= n)
{
int j = 1;
while ( j <= i)
{
System.out.print(j);
j++;
}
System.out.print(", ");
i++;
}
}
}

Output:

Enter the value of 'n'
3
1, 12, 123,

### Method-3: Java Program to Print the Series 1, 12, 123, 1234, …, n By Using User Defined Method

Approach:

• Declare an integer variable say ‘n’ which holds the value of Nth term.
• Create Scanner class object.
• Prompt the user to enter a number as value of n.
• Then call a user defined method say printSeries() by passing n as parameter.
• Inside method use a for loop from i=1 to i<=n (incremented by 1)
• Inside the for loop, we will again do a for loop from j=1 to j<=i (incremented by 1)
• Inside that loop we will print the value of j separated by comma.

Program:

import java.util.*;
public class Main
{
public static void main(String[] args)
{
// creating object of scanner class
Scanner s = new Scanner(System.in);
//Taking input of number of elements in the series
System.out.println("Enter the value of nth term 'n' ");
int n = s.nextInt();
// calling printSeries() method to print the series
printSeries(n);
}
public static void printSeries(int n)
{
for (int i = 1; i <= n; i++)
{
for (int j = 1; j <= i; j++)
{
System.out.print(j);
}
System.out.print(", ");
}
}
}


Output:

Enter the value of nth term 'n'
4
1, 12, 123, 1234,

Are you new to the java programming language? We recommend you to ace up your practice session with these Basic Java Programs Examples

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