Find Unique Elements in Array Java algorithm and source code

How to find unique elements in array java

Write a java program that inputs 5 numbers, each between 10 and 100 inclusive. As each number is read display it only if it‘s not a duplicate of any number already read display the complete set of unique values input after the user enters each new value.

Description :

The main two conditions of these programs are

  1. A number once read should not be read again.
  2. The number we read should be in the range of 10 and 100.

The logic is as follows

  1. If the number lies between 10 and 100,

Compare the recently read number with all the previously read numbers, if any number matches then declare that it a duplicate and ask the user to enter another number. Else declare that the number is not in the range of 10 and 100 and read another number.


  1. import java package
    1. import*;
    2. import java.util.*;
  2. Create class Array
  3. create main function
    1. public static void main(String ar[])
  4. Declare variable
    1. int temp, i, flag = 0;
    2. int a[] = new int[10];
  5. Scanner s = new Scanner(;
  6. Pass message to enter values
    1. System.out.println(” Enter values: “);
  7. Use for loop and write a statement and also perform the comparison.
  8. for( i = 0; i<5;)
    1. term = s.nestInt();
    2. flag = 0;
    3. if (temp > 10 && temp < 100)
      1. for int j= 0; j++)
        1. if (a[j] == temp)
          1. flag = 1;
      2. if( flag == 0);
        1. a [i] = temp;
        2. i++;
      3. else Print Number already exist, enter another value:
      4. else print number not in range
    4. Print Number in the array are:
  9. for( int j = 0; j < 5; j++)
    1. print a[j];

Program to find Unique Array Element Source code:

import java.util.*;
public class Arrayy
            public static void main(String ar[])
                        int temp,i,flag=0;
                        int a[]=new int[10];
                        Scanner s=new Scanner(;
                        System.out.println("Enter values :  ");
                        for( i=0;i<5;)
                                    if(temp>10 && temp<100)
                                                for(int j=0;j<i;j++)
                                    System.out.println("Number already entered. Enter another value : ");
                                    System.out.println("Number not in range. Enter another values : ");
                        System.out.println("Numbers in the array are : "); 
                        for(int j=0;j<5;j++)

Sample output :

find unique elements in array java

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Pramod Kumar Yadav is from Janakpur Dham, Nepal. He was born on December 23, 1994, and has one elder brother and two elder sisters. He completed his education at various schools and colleges in Nepal and completed a degree in Computer Science Engineering from MITS in Andhra Pradesh, India. Pramod has worked as the owner of RC Educational Foundation Pvt Ltd, a teacher, and an Educational Consultant, and is currently working as an Engineer and Digital Marketer.

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