Arrays in Java| One D Arrays| 2 D Array |3 D Arrays

[ravipankaj]

Implement One Dimensional Arrays in java
package com.ds.algorithms.array;

import java.util.Scanner;

/**

@Author pankaj
@create 09/04/21 5:14 PM
Note: Arrays are Fixed in Size
Array store only homogeneous element */ public class ImplementOneDArray { public static void main(String[] args) { Scanner scanner=new Scanner(System.in); System.out.println("Plz Enter the Size of Array ???"); int size=scanner.nextInt(); //code to create array with size, given by user int[] array=new int[size]; System.out.println("Plz Enter all "+size+" Value to store in Array"); //code to insert all input element from user for (int i=0;i< size;i++) { array[i]=scanner.nextInt(); } // code to print all arrays element System.out.println("All the values stored in Array is Following"); for (int i=0;i<size;i++) { System.out.println(array[i]); } } } # Implement two Dimensional Arrays in Java package com.ds.algorithms.array;
import java.util.Scanner;

/**

@Author pankaj
@create 4/10/21 11:44 AM
*
In java multi dimensional array is implemented as array of arrays concept or jagged array
Note: In multidimensional array we must need to specify base size, and remaining can be ignored.
/
public class ImplementThreeDArray {
public static void main(String[] args) {
/ #######################################
int [][][] threeDArray =new int[2][][];
threeDArray[0] =new int[3][];
threeDArray[0][0]=new int[1];
threeDArray[0][1]=new int[2];
threeDArray[0][2]=new int[3];

threeDArray[1]=new int[2][2];
#############################################*/

Scanner scanner=new Scanner(System.in);
System.out.println("Plz Enter base siz 3D Array");
int basSize1=scanner.nextInt();
System.out.println("Plz Enter base size of 2D Array");
int basSize2=scanner.nextInt();
System.out.println("Plz Enter base size of 1D Array");
int basSize3=scanner.nextInt();
//create 3 D array
int [][][] threeDArray=new int[basSize1][basSize2][basSize3];
System.out.println("Please Enter all "+basSize1*basSize2*basSize3 +" values foe 3 D Array !!!!");
for (int i=0;i<basSize1;i++)
{
for (int j=0;j<basSize2;j++)
{
for (int k=0;k<basSize3;k++)
{
threeDArray[i][j][k]=scanner.nextInt();
}
}
}
// call method to print values
printThreeDArray(threeDArray);
}

public static void printThreeDArray(int [][][] array)
{

/* for (int i=0;i<array.length;i++)
{
for (int j=0;j<array[i].length;j++)
{
for ( int k=0;k<array[i][j].length;k++)
{
System.out.print(array[i][j][k] + " ");
}
}
System.out.println();
} */
for( int [][] i:array)
{
for(int [] j: i)
{
for( int k: j)
{
System.out.print(k+" ");
}
System.out.println();
}
System.out.println();
}
}
}

code to Add Two Dimensional Array || Add two Matrix
package com.ds.algorithms.array;

/**

@Author pankaj
@create 09/04/21 6:28 PM */ public class AdditionOfTwoDMertices { public static void main(String[] args) { //array 1 int [][] array1={ {2,2,2}, {3,3,3}, {4,4,4,} }; //array 2 int [][] array2={ {2,2,2}, {5,5,5}, {6,6,6,} }; System.out.println("Print array first"); ImplementTwoDArray.printTwoDArray(array1); System.out.println("print array second"); ImplementTwoDArray.printTwoDArray(array2); // create new array to store addition of array int [] [] resultArray=new int[array1.length][array1.length]; // logic for addition for (int i=0;i
/**

@Author pankaj
@create 09/04/21 5:51 PM
*/
public class ImplementTwoDArray {
public static void main(String[] args) {
//way 1
int [][] empSalary={
//emp sal department wise,sales,testing,dev
// 1 1 3 4 5
{44444,654,897,896347,7478456},
{5845,34,234,3645,876,78687,4545,435535},
{56645566,654646,4564666,12578,45564,3434,34435,53 42,234}
};
// print all emp salary
System.out.println("+++++++++++++ print all emp salary ++++++++++++++++");
printTwoDArray(empSalary);
// way 2
int [][] twoDArray=new int[3][4];
// 3 one D array with 4 elements
System.out.println("========== print 2d array with default values==========");
printTwoDArray(twoDArray);

}
public static void printTwoDArray(int [][] array){
for (int i = 0; i < array.length; i++) // 0 to 2
{
for (int j = 0; j < array[i].length; j++) {
System.out.print(array[i][j] + " ");
}
System.out.println();
}
}
}