GitHub Tutorial: Push an Existing Local Project to GitHub

      As developers, we perform Git operations such as commit, checkout, pull, fetch, and push on a daily basis. In this post, we will learn how to push an existing local project to a GitHub repository.

For example, suppose you have a project named EmployeeManagement (EMS) on your local machine. Until you create a GitHub repository and push the project to it, other developers cannot access, collaborate on, or modify the code.

The steps to push an existing local project to a GitHub repository are as follows:

1) Create a repository on GitHub.

Create a GitHub account if you don't have.
Then Go to Account --> Your  repositories 
Click on New as shown in below screenshot. 

Github New Repo Creation

When click on New button, will open Create New Repository page.

Create Repository

Provide repository name(Usually project name)

Select public or private repository option

     To avoid merge conflicts, do not initialize the new repository with a README, LICENSE, or .gitignore file. You can add these files after your project has been pushed to GitHub.

Click the Create repository button.

2) Initialize the local directory as a Git repository.

    Change the current working directory to your local project, and then initialize it as a Git repository by running the git init command.

For example, if your project is located at C:\ProjectRepo\EMS, run the following commands:

C:\ProjectRepo\EMS>git init

3) Add the files in your new local repository(using git add command). This stages them for the first commit.

Add files to the GitHub,

C:\ProjectRepo\EMS>git add .

If you want to add a specific file instead of all files, use the following command:

C:\ProjectRepo\EMS>git add <file-path>

Adds files to the local repository and stages them for commit. To unstage a file, use the git reset HEAD <file-name> command.

4) Commit the files that you've staged in your local repository.

Use command -  git commit -m "First commit" to commit the added file to gitHub.

C:\ProjectRepo\EMS>git commit -m "First commit"

5) At the top of your GitHub repository's Quick Setup page, click  to copy the remote repository URL.

Copy below HTTPS or SSH Project URL

Remote Repo HTTPS o SSH URL

         

    In the Command prompt, add the URL for the remote repository where your local repository will be pushed.
>git remote add origin "remote repository URL"

C:\ProjectRepo\EMS>git remote add origin "remote repo HTTPS or SSH URL"

6) Push the changes in your local repository to GitHub.

 Using git push command, you can the committed files to the remote repository as follow,

C:\ProjectRepo\EMS>git push origin master

master - is the branch name.


Related Post:--
Permission denied(publickey), fatal:couldn't read from remote repository - Gihub Error

Java Program to Perform Matrix Addition and Subtraction

          In the previous post, written code for matrix transpose. In the current post, I have written a java program to perform a simple matrix addition and subtraction. 

Below is the source code of the Java Program to Perform Matrix Multiplication,

MatrixAdditionSubtraction.java,

package com.example.demo;

public class MatrixAdditionSubtraction {

        public static void main(String[] args) {

                int[][] a = { { 4, 5, 6 }, { 7, 8, 9 }, { 10, 11, 12 } };
                int[][] b = { { 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 } };

                int rows = 3;
                int columns = 3;

                int[][] c = new int[rows][columns];

                for (int i = 0; i < rows; i++) {
                       for (int j = 0; j < columns; j++) {
                              c[i][j] = a[i][j] + b[i][j];
                       }
                }

                System.out.println("The sum of the two matrices is");

                for (int i = 0; i < rows; i++) {
                       for (int j = 0; j < columns; j++) {
                              System.out.print(c[i][j] + " ");
                       }
                       System.out.println();
                }

                for (int i = 0; i < rows; i++) {
                       for (int j = 0; j < columns; j++) {
                               c[i][j] = a[i][j] - b[i][j];
                       }
                }

                System.out.println("The subtraction of the two matrices is");

                for (int i = 0; i < rows; i++) {
                       for (int j = 0; j < columns; j++) {
                              System.out.print(c[i][j] + " ");
                       }
                       System.out.println();
                }

        }
}

Output:--
The sum of the two matrices is
5 7 9 
11 13 15 
17 19 21 
The subtraction of the two matrices is
3 3 3 
3 3 3 
3 3 3 

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2) Java Program to Perform Matrix Multiplication
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4) Java Code to Print the Numbers as Pyramid - Examples
5) Java Program to find the Missing Number in an Array
6) Java program to print the first n prime numbers
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Java Program to Transpose a Matrix

            In the previous post, written code for matrix  multiplication, in the current post, we will a write a java code to transpose a given matrix. The transpose of matrix is to interchange the rows and columns for the given matrix. 

Example:-

Transpose of Matrix

The below code is the source code of java program to transpose of a given matrix,

MatrixTranspose.java,

package com.example.demo;

public class MatrixTranspose {
 
       public static void main(String[] args) {
  
               int matrix[][] = {{1,2,3,4},{5,6,7,8},{9,10,11,12}};
       
               int m = 3;    //no. of rows
               int n = 4;    //no. of columns
       
               System.out.println("Matrix before transpose is - ");

               for (int i = 0; i < m; i++) {
                      for (int j = 0; j < n; j++) {
                             System.out.print(matrix[i][j]+" ");
                      }
                      System.out.println(" ");
               }
       
               int transMatrix[][] = new int[n][m];
       
               System.out.println("Matrix after transpose is - ");

               for (int i = 0; i < n; i++) {
                      for (int j = 0; j < m; j++) {
                              transMatrix[i][j] = matrix[j][i];
                              System.out.print(transMatrix[i][j]+" ");
                      }
                      System.out.println(" ");
               }  
       }
}

Output:--
Matrix before transpose is - 
1   2   3   4  
5   6   7   8  
9 10 11 12  
Matrix after transpose is - 
1 5  9  
2 6 10  
3 7 11  
4 8 12

Related Posts:--
1) Java code to move all zero of an integer array to the end of the array
2) Java Program to Perform Matrix Multiplication
3) Write a Java program to print the Floyd's triangle
4) Java Code to Print the Numbers as Pyramid - Examples
5) Java Program to find the Missing Number in an Array
6) Java program to print the first n prime numbers
7) Swap two variables without using third variable in Java
8) Java program to find second largest number in an array
9) Sort a binary array using one traversal in Java
10) Difference between NoClassDefFoundError and ClassNotFoundException in Java

Java Program to Perform Matrix Multiplication

          In the current post, I have written a java program to perform a simple matrix multiplication. For matrix multiplication the column of the first matrix should be equal to the row of the second matrix, then only we can perform matrix multiplication.

         In matrix multiplication, one row element of first matrix is multiplied by all columns of second matrix.

Matrix multiplication example

Below is the source code of the Java Program to Perform Matrix Multiplication,

MatrixMultiplication.java,

package com.example.demo;

public class MatrixMultiplication {
 
        public static void main(String[] args) {
  
                int a[][] = {{1,2,3},{4,5,6},{7,8,9}};    
  

                int b[][] = {{1,2,3},{4,5,6},{7,8,9}};    
      
                int c[][] = new int[3][3];  //rows - 3 and columns -3 
      
                for (int i = 0; i < 3; i++) {    
   

                       for (int j = 0; j < 3; j++) {    
    

                                 c[i][j] = 0;      
    

                                 for (int k = 0; k < 3; k++) {      
     

                                       c[i][j]+= a[i][k]*b[k][j];      
    

                                 } 
    

                                 System.out.print(c[i][j]+" ");   
                         } 
   

                        System.out.println(); 
                }    
        }
}

Output:--
30 36 42 
66 81 96 
102 126 150


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2) Write a Java program to print the Floyd's triangle
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5) Java program to print the first n prime numbers
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8) Java program to find second largest number in an array
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Java Program to Move All Zeros to the End of an Array

          In this post, we will implement a Java program to move all the zeros in a given integer array to the end of the array while maintaining the relative order of the non-zero elements.

For example:

Input:

{2, 1, 0, 3, 5, 0, 9, 0}

Output:

{2, 1, 3, 5, 9, 0, 0, 0}

package com.example.demo;

public class ZeroNonZerosSeparate {
 
          public static void main(String[] args) {
  
                   int[] nums = {2,1,0,3,5,0,9,0};
  
                   int index = 0;
                   
                   for (int i = 0; i<nums.length; i++) {
                         if (nums[i] != 0) {
                                nums[index] = nums[i];
                                index++;
                         }
                   }
  
                   while (index < nums.length) {
                          nums[index] = 0;
                          index++;
                   }
  
                   for (int i = 0; i<nums.length; i++) {
                          System.out.print(nums[i]+" ");
                   }
           }

 }

Output:-
2 1 3 5 9 0 0 0 

Thank you for visting the blog.

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6) Java Program to find the Missing Number in an Array
7) Java program to print the first n prime numbers
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Difference between NoClassDefFoundError and ClassNotFoundException in Java

        Both NoClassDefFoundError and ClassNotFoundException occurs when particular class is not found at run time.They related to java classpath only but occurs different scenario's.

Difference:-

ClassNotFoundException Vs NoClassDefFoundError

1) Java Program to illustrate ClassNotFoundException

    The below code is to throw the ClassNotFoundException because JavaClass class is not found in the classpath.


ClassNotFoundExceptionExample.java

package com.example.demo;

public class ClassNotFoundExceptionExample {
 
         public static void main(String[] args) {
  
                  try {
                       Class.forName("JavaClass");
                  } catch (Exception ex) {
                       ex.printStackTrace();
                  }
         }

}

Output:-
java.lang.ClassNotFoundException: JavaClass
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at com.example.demo.ClassNotFoundExceptionExample.main(ClassNotFoundExceptionExample.java:8)

2) Program to illustrate NoClassDefFoundError

      For this you don't use any IDE, use command prompt, compile and run separately. In the below code example, created Employee class in the current class. After compilation JVM will create two classes NoClassDefFOundErrorExample.class and Example.class, before run main class delete Example.class and run the main class.

NoClassDefFoundErrorExample.java

package com.example.demo;

public class NoClassDefFOundErrorExample {
 
         public static void main(String[] args) {
                  Example ex = new Example();
                  ex.getNumber();
         }
}

Run this command for compilation,

>javac NoClassDefFoundErrorExample.java

After compilation, delete Example.class file and run the below command,

> java NoClassDefFoundErrorExample

Exception in thread "main" java.lang.NoClassDefFoundError.


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