Java Program to Convert Long to String (original) (raw)

Last Updated : 26 Dec, 2023

The long to String conversion in Java generally comes in need when we have to display a long number in a GUI application because everything is displayed in string form. In this article, we will learn about Java Programs to convert long to String.

Given a Long number, the task is to convert it into a String in Java.

**Examples of Long-to-String Conversion

**Input: Long = 20L
**Output: “20”

**Input: Long = 999999999999L
**Output: “999999999999”

Java Program for long-to-String Conversion

For converting any data type to string type, we can simply add/+ empty string indicated by double quotes(“).

**Syntax:

String str = l+" ";

Below is the implementation of the above method:

Java

public class GFG {

`` public static void main(String args[])

`` {

`` Long varLong = 999999999999L;

`` String str = varLong + " " ;

`` System.out.println( "Converted type : "

`` + str.getClass().getName());

`` System.out.println(str);

`` }

}

Output

Converted type : java.lang.String 999999999999

Methods for Conversion from long to String in Java

There are certain methods to Convert Long to String as mentioned below:

Example of Methods for Converting ong to String

Below is the implementation of the above methods:

Java

import java.util.*;

public class GFG {

`` public static void main(String args[])

`` {

`` Long varLong = 999999999999L;

`` System.out.println( "Method 1: String.valueOf()" );

`` String str = String.valueOf(varLong);

`` System.out.println( "Converted type : "

`` + str.getClass().getName()

`` + "\n" );

`` System.out.println( "Method 2: Long.toString()" );

`` str = Long.toString(varLong);

`` System.out.println( "Converted type : "

`` + str.getClass().getName()

`` + "\n" );

`` System.out.println( "Method 3: new Long(long l)" );

`` str = new Long(varLong).toString();

`` System.out.println( "Converted type : "

`` + str.getClass().getName()

`` + "\n" );

`` System.out.println( "Method 4: String.format()" );

`` str = String.format( "%d" , varLong);

`` System.out.println( "Converted type : "

`` + str.getClass().getName());

`` System.out.println(

`` "Method 5: StringBuilder, StringBuffer object" );

`` str = new StringBuilder()

`` .append(varLong)

`` .toString();

`` System.out.println( "Converted type : "

`` + str.getClass().getName());

`` System.out.println( "Output: " + str);

`` }

}

**Output

Method 1: String.valueOf()
Converted type : java.lang.String

Method 2: Long.toString()
Converted type : java.lang.String

Method 3: new Long(long l)
Converted type : java.lang.String

Method 4: String.format()
Converted type : java.lang.String
Method 5: StringBuilder, StringBuffer object
Converted type : java.lang.String
Output: 999999999999

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• Java Program to Check if two Arrays are Equal or not In Java, comparing two arrays means checking if they have the same length and identical elements. This checking process ensures that both arrays are equivalent in terms of content and structure. Example: In Java, the simplest way to check if two arrays are equal in Java is by using the built-in Arra 4 min read

• Remove all Occurrences of an Element from Array in Java In Java, removing all occurences of a given element from an array can be done using different approaches that are, Naive approach using array copyJava 8 StreamsUsing ArrayList.removeAll()Using List.removeIf()Problem Stament: Given an array and a key, the task is to remove all occurrences of the spec 5 min read

• Java Program to Find Common Elements Between Two Arrays Given two arrays and our task is to find their common elements. Examples:Input: Array1 = ["Article", "for", "Geeks", "for", "Geeks"], Array2 = ["Article", "Geeks", "Geeks"]Output: [Article, Geeks] Input: Array1 = ["a", "b", "c", "d", "e", "f"], Array2 = ["b", "d", "e", "h", "g", "c"]Output: [b, c, d 4 min read

• Array Copy in Java In Java, copying an array can be done in several ways, depending on our needs such as shallow copy or deep copy. In this article, we will learn different methods to copy arrays in Java. Example: Assigning one array to another is an incorrect approach to copying arrays. It only creates a reference to 6 min read

• Java Program to Left Rotate the Elements of an Array In Java, left rotation of an array involves shifting its elements to the left by a given number of positions, with the first elements moving around to the end. There are different ways to left rotate the elements of an array in Java. Example: We can use a temporary array to rotate the array left by 5 min read

Java 2-D Arrays (Matrix) Programs

• Print a 2D Array or Matrix in Java In this article, we will learn to Print 2 Dimensional Matrix. 2D-Matrix or Array is a combination of Multiple 1 Dimensional Arrays. In this article we cover different methods to print 2D Array. When we print each element of the 2D array we have to iterate each element so the minimum time complexity 4 min read

• Java Program to Add two Matrices Given two matrices A and B of the same size, the task is to add them in Java. Examples: Input: A[][] = {{1, 2}, {3, 4}} B[][] = {{1, 1}, {1, 1}} Output: {{2, 3}, {4, 5}} Input: A[][] = {{2, 4}, {3, 4}} B[][] = {{1, 2}, {1, 3}} Output: {{3, 6}, {4, 7}} Program to Add Two Matrices in JavaFollow the St 2 min read

• Sorting a 2D Array according to values in any given column in Java We are given a 2D array of order N X M and a column number K ( 1<=K<=m). Our task is to sort the 2D array according to values in Column K. Examples: Input: If our 2D array is given as (Order 4X4) 39 27 11 42 10 93 91 90 54 78 56 89 24 64 20 65 Sorting it by values in column 3 Output: 39 27 11 3 min read

• Java Program to Check if two Arrays are Equal or not In Java, comparing two arrays means checking if they have the same length and identical elements. This checking process ensures that both arrays are equivalent in terms of content and structure. Example: In Java, the simplest way to check if two arrays are equal in Java is by using the built-in Arra 4 min read

• Java Program to Find Transpose of Matrix Transpose of a matrix is obtained by changing rows to columns and columns to rows. In other words, the transpose of A[ ][ ] is obtained by changing A[i][j] to A[j][i]. Example of First Transpose of MatrixInput: [ [ 1 , 2 , 3 ] , [ 4 , 5 , 6 ] , [ 7 , 8 , 9 ] ]Output: [ [ 1 , 4 , 7 ] , [ 2 , 5 , 8 ] 5 min read

• Java Program to Find the Determinant of a Matrix The determinant of a matrix is a special calculated value that can only be calculated if the matrix has same number of rows and columns (square matrix). It is helpful in determining the system of linear equations, image processing, and determining whether the matrix is singular or non-singular. In t 5 min read

• Java Program to Find the Normal and Trace of a Matrix For a given 2D matrix, the purpose is to find the Trace and Normal of the matrix. In this article, we will learn about Normal and Trace of a Matrix in Java. Examples : Input : matrix[][] = {{1, 4, 4}, {2, 3, 7}, {0, 5, 1}}; Output : Normal = 11 Trace = 5 Explanation : Normal = sqrt(1*1+ 4*4 + 4*4 + 3 min read

• Java Program to Print Boundary Elements of the Matrix Given a matrix of size Row x Col Print the boundary elements of the matrix. Boundary elements are those elements which are not surrounded by elements on all four directions, i.e. elements in the first row, first column, last row and last column. Example: Input : 1 2 3 4 5 6 7 8 9 Output: 1 2 3 4 6 7 2 min read

• Java Program to Rotate Matrix Elements A matrix is simply a two-dimensional array. So, the goal is to deal with fixed indices at which elements are present and to perform operations on indexes such that elements on the addressed should be swapped in such a manner that it should look out as the matrix is rotated. For a given matrix, the t 6 min read

• Java Program to Compute the Sum of Diagonals of a Matrix For a given 2D square matrix of size N*N, the task is to find the sum of elements in the Principal and Secondary diagonals. For example, analyze the following 4 × 4 input matrix. a00 a01 a02 a03a10 a11 a12 a13a20 a21 a22 a23a30 a31 a32 a33 Example: Input 1 : 6 7 3 4 8 9 2 1 1 2 9 6 6 5 7 2Output 1 : 4 min read

• Java Program to Interchange Elements of First and Last in a Matrix Across Rows For a given 4 × 4 matrix, the task is to interchange the elements of the first and last rows and then return the resultant matrix. Illustration: Input 1: 1 1 5 0 2 3 7 2 8 9 1 3 6 7 8 2 Output 1: 6 7 8 2 2 3 7 2 8 9 1 3 1 1 5 0 Input 2: 7 8 9 10 11 13 14 1 15 7 12 22 11 21 30 1 Output 2: 11 21 30 1 3 min read

• Java Program to Interchange Elements of First and Last in a Matrix Across Columns For a given 4 x 4 matrix, the task is to interchange the elements of the first and last columns and then return the resultant matrix. Example Test Case for the ProblemInput : 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16Output : 4 2 3 1 8 6 7 5 12 10 11 9 16 14 15 13 Implementation of Interchange Elements 2 min read

Java String Programs

• Java Program to Get a Character from a String Given a String str, the task is to get a specific character from that String at a specific index. Examples: Input: str = "Geeks", index = 2Output: eInput: str = "GeeksForGeeks", index = 5Output: F Below are various ways to do so: Using String.charAt() method: Get the string and the indexGet the spec 5 min read

• Replace a character at a specific index in a String in Java In Java, here we are given a string, the task is to replace a character at a specific index in this string. Examples of Replacing Characters in a StringInput: String = "Geeks Gor Geeks", index = 6, ch = 'F'Output: "Geeks For Geeks."Input: String = "Geeks", index = 0, ch = 'g'Output: "geeks"Methods t 3 min read

• Reverse a String in Java In Java, reversing a string means reordering the string characters from the last to the first position. Reversing a string is a common task in many Java applications and can be achieved using different approaches. In this article, we will discuss multiple approaches to reverse a string in Java with 7 min read

• Java Program to Reverse a String using Stack The Stack is a linear data structure that follows the LIFO(Last In First Out) principle, i.e, the element inserted at the last is the element to come out first. Approach: Push the character one by one into the Stack of datatype character.Pop the character one by one from the Stack until the stack be 2 min read

• Sort a String in Java (2 different ways) The string class doesn't have any method that directly sorts a string, but we can sort a string by applying other methods one after another. The string is a sequence of characters. In java, objects of String are immutable which means a constant and cannot be changed once created. Creating a String T 6 min read

• Swapping Pairs of Characters in a String in Java Given string str, the task is to write a Java program to swap the pairs of characters of a string. If the string contains an odd number of characters then the last character remains as it is. Examples: Input: str = “Java”Output: aJav Explanation: The given string contains even number of characters. 3 min read

• Check if a given string is Pangram in Java Given string str, the task is to write Java Program check whether the given string is a pangram or not. A string is a pangram string if it contains all the character of the alphabets ignoring the case of the alphabets. Examples: Input: str = "Abcdefghijklmnopqrstuvwxyz"Output: YesExplanation: The gi 3 min read

• Print first letter of each word in a string using regex Given a string, extract the first letter of each word in it. "Words" are defined as contiguous strings of alphabetic characters i.e. any upper or lower case characters a-z or A-Z. Examples: Input : Geeks for geeksOutput :Gfg Input : United KingdomOutput : UKBelow is the Regular expression to extract 3 min read

• Java Program to Determine the Unicode Code Point at Given Index in String ASCII is a code that converts the English alphabets to numerics as numeric can convert to the assembly language which our computer understands. For that, we have assigned a number against each character ranging from 0 to 127. Alphabets are case-sensitive lowercase and uppercase are treated different 5 min read

• Remove Leading Zeros From String in Java Given a string of digits, remove leading zeros from it. Illustrations: Input : 00000123569Output: 123569 Input: 000012356090Output: 12356090 Approach: We use the StringBuffer class as Strings are immutable. Count leading zeros by iterating string using charAt(i) and checking for 0 at the "i" th indi 3 min read

• Compare two Strings in Java String in Java are immutable sequences of characters. Comparing strings is the most common task in different scenarios such as input validation or searching algorithms. In this article, we will learn multiple ways to compare two strings in Java with simple examples. Example: To compare two strings i 4 min read

• Compare two strings lexicographically in Java In this article, we will discuss how we can compare two strings lexicographically in Java. One solution is to use Java compareTo() method. The method compareTo() is used for comparing two strings lexicographically in Java. Each character of both the strings is converted into a Unicode value for comp 3 min read

• Java program to print Even length words in a String Given a string s, write a Java program to print all words with even length in the given string. Example to print even length words in a String Input: s = "i am Geeks for Geeks and a Geek" Output: am Geek Example: [GFGTABS] Java // Java program to print // even length words in a string class GfG { pu 3 min read

• Insert a String into another String in Java Given a String, the task is to insert another string in between the given String at a particular specified index in Java. Examples: Input: originalString = "GeeksGeeks", stringToBeInserted = "For", index = 4 Output: "GeeksForGeeks" Input: originalString = "Computer Portal", stringToBeInserted = "Sci 4 min read

• Split a String into a Number of Substrings in Java Given a String, the task it to split the String into a number of substrings. A String in java can be of 0 or more characters. Examples : (a) "" is a String in java with 0 character (b) "d" is a String in java with 1 character (c) "This is a sentence." is a string with 19 characters. Substring: A Str 5 min read