public class Employee {//实例化对象时,在调用构造函数之前前初始化字段;    private int id; // 实例化对象时初始化为0    private String name; // 实例化对象时初始化为null    private boolean flag; // 实例化对象时初始化为false    private static int age = 22; // 加载类时初始化为22    // 在构造函数之前初始化    {        int num = 1111; // 实例化对象时初始化为1111        String name = "QA";// 实例化对象时初始化为QA        setId(num); // 实例化对象时调用        SetName(name); // 实例化对象时调用        System.out.println("call instance method");    }//类加载时调用静态方法初始化静态字段;    static {        System.out.println("age is: " + age);        age = 30; // 加载类时初始化为33        print(); // 加载类时时调用    }    public void SetName(String name) {        this.name = name;    }    public int getId() {        return id;    }    public String getName() {        return name;    }    public static int getAge() {        return age;    }    public void setId(int num) {        id = num;    }    public static void print() {        System.out.println("call static method");    }    public Employee() {        // TODO Auto-generated constructor stub    }    public Employee(int id, String name) {        // TODO Auto-generated constructor stub        this.id = id;        this.name = name;        System.out.println("call constructor method");    }    public static void main(String[] args) {        // TODO Auto-generated method stub        System.out.println("---------------------------");        System.out.println("age is: " + Employee.getAge());        System.out.println("---------------------------");        Employee e = new Employee();        System.out.println("id is: " + e.getId());        System.out.println("name is: " + e.getName());        System.out.println("---------------------------");        Employee e2 = new Employee(2222, "Dev");        System.out.println("id is: " + e2.getId());        System.out.println("name is: " + e2.getName());    }}