findprime.java

it is a good tool to help you study java

class FindPrime{
public static void main(String args[]){
int num;
boolean isprime=true;
num=7;
for(int i=2;i<=num/2;i++)
{
if(num%i==0){    //if语句判断是否为素数
isprime=false;
break;             //break:一旦遇到被整除,则退出循环
}
}
if(isprime) System.out.println("prime");
else System.out.println("not prime");
}
}