override the toString method in your classes : toString « Class Definition « Java Tutorial

1. Java Tutorial
2. Class Definition
3. toString

public class MainClass {
  public static void main(String[] args) {
    Employee emp = new Employee("Martinez", "Anthony");
    System.out.println(emp.toString());
  }
}

class Employee {
  private String lastName;

  private String firstName;

  public Employee(String lastName, String firstName) {
    this.lastName = lastName;
    this.firstName = firstName;

  }

  public String toString() {
    return "Employee[" + this.firstName + " " + this.lastName + "]";
  }
}