Java Exercises: Check if the value 20 appears three times and no 20's are next to each other in a given array of integers
Java Basic: Exercise-98 with Solution
Write a Java program to check if the value 20 appears three times and no 20’s are next to each other in a given array of integers.
Pictorial Presentation:

Sample Solution:
Java Code:
import java.util.*;
import java.io.*;
public class Exercise98 {
public static void main(String[] args)
{
int[] array_nums = {10, 20, 10, 20, 40, 13, 20};
int count = 0, result =0;
if(array_nums.length >= 1 && array_nums[0] == 20)
count++;
for(int i = 1; i < array_nums.length; i++) {
if(array_nums[i - 1] == 20 && array_nums[i] == 20)
{
System.out.printf( String.valueOf(false));
result = 1;
}
if(array_nums[i] == 20)
count++;
}
if (result==0)
{
System.out.printf( String.valueOf(count == 3));
}
System.out.printf("\n");
}
}
Sample Output:
true
Flowchart:

Java Code Editor:
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Previous: Write a Java program to check if an array of integers contains a specified number next to each other or there are two same specified numbers separated by one element.
Next: Write a Java program to check if a specified number appears in every pair of adjacent element of a given array of integers.
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Java: Tips of the Day
countOccurrences
Counts the occurrences of a value in an array.
Use Arrays.stream().filter().count() to count total number of values that equals the specified value.
public static long countOccurrences(int[] numbers, int value) { return Arrays.stream(numbers) .filter(number -> number == value) .count(); }
Ref: https://bit.ly/3kCAgLb
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