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CHAPTERSEVEN

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Arrays in Java

Explore the different cores of java programming below

Declaring and Initializing Arrays

To use arrays in Java, they must first be declared and initialized.

Advantages and Limitations of Arrays

Arrays are fast for data access due to their indexed structure and are simple to implement for small datasets.




Example 1: Declaring an Array







public class ArrayExample {
public static void main(String[] args) {
// Declare and initialize an array
int[] numbers = {10, 20, 30, 40, 50};
// Print the array elements
for (int number : numbers) {
System.out.println( "count" + number);
}
}
}
    
/* After excution of the code 
    
Count: 0
Count: 1
Count: 2
Count: 3
Count: 4
     */
Output: 

Count: 0
Count: 1
Count: 2
Count: 3
Count: 4




Example 2: Inserting an Item in an Array 




import java.util.Arrays;

public class InsertInArray {
public static void main(String[] args) {
int[] numbers = {10, 20, 30, 40};
int position = 2; // Index to insert the new value
int valueToInsert = 25;
  
// Create a new array with additional space
int[] newArray = new int[numbers.length + 1];
  
// Copy elements up to the insertion point
for (int i = 0; i < position; i++) {
newArray[i] = numbers[i];
}
  
// Insert the new value
newArray[position] = valueToInsert;
  
// Copy the remaining elements
for (int i = position; i < numbers.length; i++) {
newArray[i + 1] = numbers[i];
}
  
System.out.println("Array after insertion: " + Arrays.toString(newArray));
}
  }
Output: 

10 20 25 30 40

Example 3: Removing an Element in an Array



import java.util.Arrays;

public class RemoveFromArray {
public static void main(String[] args) {
int[] numbers = {10, 20, 30, 40, 50};
int positionToRemove = 2; // Index to remove the element
                  
// Create a new array with one less space
int[] newArray = new int[numbers.length - 1];
                  
// Copy elements except the one to remove
for (int i = 0, k = 0; i < numbers.length; i++) {
if (i != positionToRemove) {
newArray[k++] = numbers[i];
}

}
                  
System.out.println("Array after removal: " + Arrays.toString(newArray));
}
}
Output: 
10 20  40 50




Example 4: Performing Other Array Operations



import java.util.Arrays;

public class ArrayOperations {
public static void main(String[] args) {
int[] numbers = {5, 2, 9, 1, 6};
                  
// Sort the array
Arrays.sort(numbers);
System.out.println("Sorted Array: " + Arrays.toString(numbers));
                  
// Search for an element
int searchKey = 9;
int index = Arrays.binarySearch(numbers, searchKey);
if (index >= 0) {
System.out.println("Element " + searchKey + " found at index: " + index);
} else {
System.out.println("Element " + searchKey + " not found.");

}
                  
// Find the maximum element
int max = Arrays.stream(numbers).max().getAsInt();
System.out.println("Maximum Element: " + max);
                  
// Find the sum of all elements
int sum = Arrays.stream(numbers).sum();
System.out.println("Sum of Elements: " + sum);
}
}
Output: 

23




TESTIMONIES

vildash network team has had alot of impact on others but here are the vildash network team testimonies and expirience while working with the team

favour

am a graphic designer for vildash. when i first join vildash my first dream was programing but i got to know that programing neeeds alot of patients and coding but now my dream is more on the front end so i design graphics and make amazing ui/ux design. vildash is and amazing and great team

MR BK

when i first joined vildash my first vision was that i wanted to upgrade my skills and i really wanted to take a longer time but with vildash i got to know the fastest way in other to be perfect in programing and building amazing projects with ease

MR ENGEBEL

i was nothing in programing and i was discouraged cause i discovered that all programers had laptops but i didnt have and i got discouragecd cause, i thought i didnt evn have that chance to be a programer because of that but when i join vildash i got to know that its not just about the laptop its about the determination and if i have the determination i can archive. and i got to start programing with just my android phone and just like that am gradually getting there

MR LEWIS

vildash network has given me a chance to become a programmer, i now do thinks i didnt know i would be able to do, i now know tyhat i dont have to get distracted i need to stay focused and archive my goals

MR BROSKII

am a good programmer and i didnt have a team but i never knew how working with a team fills like but vildash network has given me the best expirience of how that feel, now i can boast of working with a team and the best team. it feels really greate cause with vildashi have to know that i can use my skills to do more than i dreamed of.

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