Java Program to Replace all the Positive Elements of the Array with 1 and all the Negative Elements with 0

In the previous article, we have seen Java Program to sort array alternatively based on highest average of even or odd elements of the array

In this article we are going to see how to replace all the negative integers with zero and all the positive integers with one using Java programming language.

Java Program to Replace all the Positive Elements of the Array with 1 and all the Negative Elements with 0

Array is a data structure which stores a fixed size sequential collection of values of single type. Where with every array elements/values memory location is associated. Each array elements have it’s own index where array index starts from 0.

In Array set of variables referenced by a single variable name and it’s array index position. It is also called as a container object which contains elements of similar type.

Declaration of an array:

dataType[] arrayName; (or)                              //Declaring an array
dataType []arrayName; (or)
dataType arr[];

Instantiation of an Array:

arrayName = new datatype[size];                    //Allocating memory to array

Combining both Statements in One:

dataType[] arrayName = new dataType[size] //Declaring and Instantiating array

Initialization of an Array:

arrayName[index-0]= arrayElement1             //Initializing the array

...

arrayName[index-s]= arrayElementS

Combining all Statements in One:

dataType arrayName[ ]={e1,e2,e3};               //declaration, instantiation and initialization

Let’s see different ways to replace all the negative integers with zero and all the positive integers with one.

By Static Initialization of Array Elements
By Dynamic Initialization of Array Elements

Method-1: Java Program to Replace all the Positive Elements of the Array with 1 and all the Negative Elements with 0 By Static Initialization of Array Elements

Approach:

Declare and initialize an array.
Iterate over the array.
If the current element is negative replace it with 0.
Else, if it is positive replace it with 1.

Program:

public class Main
{
    public static void main(String[] args) 
    {
        //array declared
        int[] arr = { 12, 32, 45, -23, -1 };

        // printing the array
        System.out.print("Original array: ");
        printArray(arr);

        // iterating over the array
        for (int i = 0; i < arr.length; i++) 
        {
            // if the element is negative replace it with 0
            if (arr[i] < 0) 
            {
                arr[i] = 0;
                
            }
            // if the element is positive replace it with 1
            else 
            {
                arr[i] = 1;
            }
        }
        // printing the array
        System.out.print("Modified array: ");
        //calling printArray() method
        printArray(arr);
    }
    
    //method to print the array
    public static void printArray(int[] arr) 
    {
        for (int i = 0; i < arr.length; i++) 
        {
            System.out.print(arr[i] + " ");
        }
        System.out.println();
    }

}

Output:

Original array: 12 32 45 -23 -1 
Modified array: 1 1 1 0 0

Method-2: Java Program to Replace all the Positive Elements of the Array with 1 and all the Negative Elements with 0 By Dynamic Initialization of Array Elements

Approach:

Create scanner class object.
Ask user for length of the array.
Initialize the array with given size.
Ask the user for array elements.
Iterate over the array.
If the current element is negative replace it with 0.
Else, if it is positive replace it with 1.

Program:

import java.util.Scanner;

public class Main
{
    public static void main(String[] args) 
    {
        // create scanner class object
        Scanner sc = new Scanner(System.in);
        // take input from user for array size
        System.out.print("Enter the size of array: ");
        int n = sc.nextInt();
        // initialize array with size n
        int[] arr = new int[n];
        // take input from user for array elements
        System.out.print("Enter array elements: ");
        for (int i = 0; i < n; i++) {
            arr[i] = sc.nextInt();
        }
        // printing the array
        System.out.print("Original array: ");
        printArray(arr);

        // iterating over the array
        for (int i = 0; i < arr.length; i++) 
        {
            // if the element is negative replace it with 0
            if (arr[i] < 0) 
            {
                arr[i] = 0;
               
            } 
             // if the element is positive replace it with 1
            else 
            {
                arr[i] = 1;
            }
        }
        // printing the array
        System.out.print("Modified array: ");
        printArray(arr);
    }

    //method to print the array
    public static void printArray(int[] arr) 
    {
        for (int i = 0; i < arr.length; i++) 
        {
            System.out.print(arr[i] + " ");
        }
        System.out.println();
    }

}

Output:

Enter the size of array: 5
Enter array elements: 1 -2 -3 4 5
Original array: 1 -2 -3 4 5 
Modified array: 1 0 0 1 1

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