In this class, I am using "display()" method which displays whether the number is a prime number. Note that method is different from object though it seems similar a little.
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class Test{
public static void main(String args[]){
display(44);
display(5);
display(46487);
display(97247);
}
private static void display(int Num){
if( isPrimeNum( Num ) ) {
System.out.println( Num + " is a prime number." );
} else{
System.out.println( Num +" isn't a prime number.");
}
}
private static boolean isPrimeNum( int x ) {
if( x == 2 )
return true;
if( x < 2 || x % 2 == 0 )
return false;
for( int a = 3; a <= Math.sqrt((double)x); a += 2 )
if( x % a == 0 )
return false;
return true;
}
}
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