java method TestJava4_9 方法的参数与返回值

public class TestJava4_9 {
public static void main(String args[]) {
int num;
num = star(7);//运行star(7)方法，然后把返回值赋给num
System.out.println(num+" stars printed");
}

public static int star(int n) {
for (int i = 1; i < 2*n; i++) {
System.out.print("*");
}
System.out.print("\n");
return 2*n; //star()的返回值是：2*n
}
}