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Use Sieve of Eratosthenes algorithm public int countPrimes(int n) { boolean[] isPrime = new boolean[n]; for(int i = 2; i < n; i++) { isPrime[i] = true; } for(int i = 2; i * i < n; i++) { if(!isPrime[i]) { continue; } else { for(int j= i * i; j < n; j += i) { isPrime[j] = false; } } } int counter = 0; for(int i = 2; i < n; i++) { if(isPrime[i]) { counter++; } } return counter; }
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