# Java Program to Increment by 1 to all the Digits of a given Integer

• Last Updated : 24 Nov, 2020

Given an integer, the task is to generate a Java Program to Increment by 1 All the Digits of a given Integer.

Examples:

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```Input: 12345
Output: 23456

Input: 110102
Output: 221213
```

Approach 1:

In this approach, we will create a number which will be of the same length as the input and will contain only 1 in it. Then we will add them.

1. Take the integer input.
2. Find its length and then generate the number containing only 1 as digit of the length.
4. Print the result.

## Java

 `// Java Program to Increment by 1 All the Digits of a given``// Integer`` ` `// Importing Libraries``import` `java.util.*;``import` `java.io.*;`` ` `class` `GFG {``    ``// Main function``    ``public` `static` `void` `main(String[] args)``    ``{``        ``// Declaring the number``        ``int` `number = ``110102``;`` ` `        ``// Converting the number to String``        ``String string_num = Integer.toString(number);`` ` `        ``// Finding the length of the number``        ``int` `len = string_num.length();`` ` `        ``// Declaring the empty string``        ``String add = ``""``;`` ` `        ``// Generating the addition string``        ``for` `(``int` `i = ``0``; i < len; i++) {``            ``add = add.concat(``"1"``);``        ``}`` ` `        ``// COnverting it to Integer``        ``int` `str_num = Integer.parseInt(add);`` ` `        ``// Adding them and displaying the result``        ``System.out.println(number + str_num);``    ``}``}`
Output
```221213
```

Approach 2:

In this approach, we will take an integer variable with value 1, we will multiply that variable with 10 and keep on adding the variable to the number till both of them have the same length.

1. Take the integer input.
2. Add value 1 to the input.
3. Multiply 1 with 10 and again add them.
4. Keep on repeating step 2 and 3 till both of them have the same length.
5. Print the result.

## Java

 `// Java Program to Increment by 1 All the Digits of a given``// Integer`` ` `// Importing Libraries``import` `java.util.*;``import` `java.io.*;`` ` `class` `GFG {``    ``// Main function``    ``public` `static` `void` `main(String[] args)``    ``{``        ``// Declaring the number``        ``int` `number = ``110102``;``        ``// Declaring another variable with value 1``        ``int` `add = ``1``;`` ` `        ``for` `(``int` `i = ``0``; i < String.valueOf(number).length();``             ``i++) {``            ``// Adding variable add  and number``            ``number = number + add;`` ` `            ``// Multiplying value of the add with 10``            ``add = add * ``10``;``        ``}``        ``// Printing result``        ``System.out.println(number);``    ``}``}`
Output
```221213
```

Time Complexity: O(l) where l is the length of an integer.

Space Complexity: O(1)

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