public class Employee {
  private String name;
  private String gender;
  private int age;
  private double salary;

  public Employee() {
    this.salary = 1000.0;
  }

  public Employee(String name, String gender, int age, double salary) {
    this.name = name;
    this.gender = gender;
    this.age = age;
    this.salary = salary;
  }
}

public class Employee {
  private String name;
  private String gender;
  private int age;
  private double salary = 1000.0;

  public Employee() {
  }
  public Employee(String name, String gender, int age, double salary) {
    this.name = name;
    this.gender = gender;
    this.age = age;
    this.salary = salary;
  }
}

public class Employee {
  private String name;
  private String gender;
  private int age;
  private double salary;
  private static String test;

  //靜態(tài)初始化塊：類(lèi)第一次被加載時(shí)執(zhí)行
  static {
    System.out.println("類(lèi)加載");
    test = "hello world!"
  }
  
  //初始化塊
  {
    name = "xiao";
    gender = "m";
    age = 20;
    salary = 1000.0;
    System.out.println("初始化");
  }

  @Override
  public String toString() {
    return "Employee{" +
        "name='" + name + '\'' +
        ", gender='" + gender + '\'' +
        ", age=" + age +
        ", salary=" + salary +
        '}';
  }
  public static void main(String[] args) {
    Employee employee = new Employee();
    System.out.println(employee.toString());
  }
}