Prime numbers program in java

public class PrimeExample{    
  public static void main(String args[]){    
    int i,m=0,flag=0;      
    int n=3;//it is the number to be checked    
    m=n/2;      
    if(n==0||n==1) System.out.println(n+" is not prime number");      
    else{  
      for(i=2;i<=m;i++)	if(n%i==0) {      
        System.out.println(n+" is not prime number");      
        flag=1;      
        break;      
        }       
      if(flag==0) System.out.println(n+" is prime number");
    }//end of else  
  }    
}

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