Source Code : Is Prime

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Is Prime

      
//package util;

import java.util.ArrayList;
import java.util.List;

public class IsPrimeOld {
  private static List<Long> primeList = new ArrayList<Long>();
  private static long maxNumber = 3;

  private static long newMaxNumber = 0;

  private boolean isPrimer;

  private long number;

  public IsPrimeOld(long number) {
    this.number = number;
    if (number == 2L || number == 3L) {
      this.isPrimer = true;
    } else if (number < maxNumber) {
      this.isPrimer = initIsPrimer();
    } else {
      newMaxNumber = number;
      initPrimeList();
      this.isPrimer = initIsPrimer();
    }
  }
  private static void initPrimeList() {

    long start = System.currentTimeMillis();
    if (maxNumber == 3) {
      primeList.add(2L);
      primeList.add(3L);
    }
    for (long i = maxNumber; i < newMaxNumber; i += 2) {
      long j = 1;
      double temp = Math.sqrt(i);
      for (j = 2; j < temp; j++) {
        if (i % j == 0)
          break;
      }
      if (j == (long) temp + 1) {
        primeList.add(i);
      }
    }
    long end = System.currentTimeMillis();
    maxNumber = newMaxNumber;
  }
  private boolean initIsPrimer() {
    long start = System.currentTimeMillis();
    boolean b = true;
    for (Long primer : primeList) {
      if (number % primer == 0) {
        b = false;
        break;
      }
    }
    long end = System.currentTimeMillis();
    return b;
  }
}

   
    
    
    
    
    
  

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