Java Program to find Index of specific Element in an array

Java Program to find Index of Specific element in the array:

The above diagram depicts array of size 5, if we want to find at which location number 50 is stored in the array, So we can find an index/ location of 50 with the help of this program. Here Index of 50 is ‘4’ so the program must return 4 as an output.

Algorithm/Program Explanation.

• Start
• Create Index method with parameters.
  • public static int index(int array[], int temp)
  • where temp is variable whose index is to be found.
• Store the length of array in variable length.
  • int length=array.length;
• check for index with while loop
  • while(i<length)
  • if(array[i]==temp) return i//return index when array[i]=temp;
  • else(i=i+1)
• Given array input
  • int array[]={10,20,30,40,50};
  • print index of an elements;
• end

Example 1: Taking Static Input

import java.util.*;
public class findindex()
{
  public static int index(int array[],int temp){
  if(array==null)return 0;
  int length=array.length;
  int i=0;
  while(i<length)
  {
   if(array[i]==temp) return i;
   else(i=i+1)
  }
 return 0;
}
  public static void main (String args[]){
 int array={10,20,30,40,50};
 System.out.println("Index of Array Element 50 is" +index(array,50));
}
}

Output:
Index of Array Element 50 is 4

Example 2: Taking Input from User

• Start
• Create Index method with parameters.
  • public static int index(int array[], int temp)
• where temp is variable whose index is to be found.
• Store the length of array in variable length.
  • int length=array.length;
• check for index with while loop.
  • while(i<length)
  • if(array[i]==temp) return i//return index when array[i]=temp;
  • else(i=i+1)
• Given array input
  • int size;
  • Scanner sc=new Scanner(System.in);
  • size=sc.nextInt();
  • int array[]=new int[size];
  • using for loop take input to array
    • for(int i=0;i<size;i++){
    • array[i]=sc.nextInt();}
• print index of an elements;
• end

import java.util.*;
public class findindex()
{
  public static int index(int array[],int temp){
  if(array==null)return 0;
  int length=array.length;
  int i=0;
  while(i<length)
  {
   if(array[i]==temp) return i;
   else(i=i+1)
  }
 return 0;
}
  public static void main (String args[]){
   int size;
 System.out.println(Enter Number of Array Elements:);
 Scanner sc=new Scanner(System.in);
 size=sc.nextInt();
 System.out.println("Enter Elements to Array:");
 for(int i=0;i,size;i++){
 array[i]=sc.nextInt();
}
 System.out.println("Index of Array Element 50 is" +index(array,50));
}
}

Output:
Enter Number of Array Elements:
5
Enter Elements to Arrays:
10 20 30 40 50
Index of Array Element 50 is 4

Java Program to find the Index of Specific element in the array: Question can be asked in this topic

1. Write a program to find the index of the given number in array?
2. Find Index of element in user-defined array?
3. State different ways to find the index of the element in an array?
4. Given is an array of size 6 find index of Number 29 in array?
   • In this type of question just write the logic, No need of defining an array.

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