Prime number checking in java, checking the prime numbers from list of random numbers

public class PrimeCheckerImpl {
/**
* @Srinivas Kumar
*/


public Map<Integer, Boolean> primeChecker(List<Integer> randList) {
int i,m=0,flag=0;  
Map<Integer,Boolean> primeCheckMap=new HashMap<>();
Iterator<Integer> itrList= randList.iterator();
if(itrList.hasNext()){
int randNum=itrList.next();
 m=randNum/2;  
 for(i=2;i<=m;i++){  
  if(randNum%i==0){  
  System.out.println("Number is not prime");  
  flag=1;
  primeCheckMap.put(randNum, false);
  break;  
  }  
 }  
 if(flag==0)  
 System.out.println("Number is prime");
 primeCheckMap.put(randNum, true);
}    
return primeCheckMap;
}
public static void main(String[] args) {

PrimeCheckerImpl   look_up=new PrimeCheckerImpl ();
                List<Integer>  posNumList=new ArrayList<Integer>();
               Random randomList=new Random();
Integer genNum=randomList.nextInt();
System.out.println(randomList.nextInt());
for (int i=0;i<10;i++){
IRandom randomnum=new Random();
if(randomnum>0){
posNumList.add(num);
}
                                   }

Map<Integer, Boolean> primeList=look_up.primeChecker(posNumList);
/
System.out.println(primeList);
}

}

Share This