すまん。changeDataが抜けてた public class Employee { private int n; private String s = "No name"; public Employee() {} public Employee(int n, String s) { changeData(n, s); } public void changeData(int n, String s) { this.n = n; this.s = s; } public static void description() { System.out.println("This is Program Printing Employee data."); System.out.println("Have fun!"); } public void print() { System.out.println("No : " + n); System.out.println("Name : " + s); } }