int count = 1;

for (int i = 1; i <= 5; i++) {//第一次i出去是1

       count += i;}

System.out.println(count);

 String s = new String("abcdefg");

for (int i=0; i<s.length(); i+=2){

System.out.print(s.charAt(i));

} 

public class test { static int i; public int aMethod() {

  i++;

  return i;

 }

public static void main (String[] args) {   

        Test test=new Test() ; 

        test.aMethod () ;

System.out.println (test.aMethod()) ; } }