Write a Program Print 2D Array in Java - Technology369kk

 Print 2D Array 

Program:  

// Program |Code                                                      

import java.util.*;                                                   //import :- java labaries file from java server.  

class TwoDArray{                                                      // class : This is a keyword declare in java it is complasarry.

    public static void main(String args[]){                           // public : is a access modifier and

                                                                     // "static" : is also a keyword but static method executed by JVM and save memory.

                                                                     // " void"  : is return type of method, it means it doesn't return any value

                                                                    //  "main" :  it is entry point of pragram, start program from here and it is called by runtime system.

                                                                    // "String arg[]" : it is used to command line argument.  

        int twoD[][]= new int[4][5];

        int k = 0, i, j;

        for (i = 0;  i< 4; i++)

        for (j = 0;  j< 5; j++){

            twoD[i][j] = k;

            k++;

        }

        for(i =0; i< 4; i++){

            for(j =0; j<5; j++)

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

            System.out.println();                                   // System.out.Println():  it is used to print statement.

        }

    }

}

Explanation of this program:  

Key Components of the Program:

1. import java.util.*;

Imports all classes from the java.util package.

Not directly needed here as no utility classes (like Scanner) are used.

2. Class Declaration: 

class TwoDArray{

• Defines the class TwoDArray. In Java, all code must reside inside a class.

3. main Method:

    public static void main(String args[]){  

• public: Makes the method accessible to the JVM.
• static: Allows the method to run without creating an instance of the class.
• void: Specifies that the method does not return any value.
• String args[]: Allows the program to accept command-line arguments.

4. Two-Dimensional Array Declaration:

   int twoD[][]= new int[4][5];

• twoD is a 2D array with 4 rows and 5 columns.
• Memory is allocated using new int[4][5].

5. Looping the Array:

 

        int k = 0, i, j;

        for (i = 0;  i< 4; i++)

        for (j = 0;  j< 5; j++){

            twoD[i][j] = k;

            k++;

        }

•  k starts at 0 and increments by 1 for each element.
• This loop assigns values to each element of the 2D array row by row.

6. Printing the Array:  

• Outer loop (i) iterates over rows.
• Inner loop (j) iterates over columns.
• System.out.print prints values in the same line, separated by spaces.
• System.out.println moves to the next line after printing each row.

OUTPUT:

PS D:\Learning File\BCA\BCA 3rd Sem\JAVA OOP\AllPraQue> java TwoDArray

0 1 2 3 4

5 6 7 8 9

10 11 12 13 14

15 16 17 18 19