java反射-获取类的Class对象方式

public class UserInfo {
 
    private long id;
    private String username;
    private String password;
 
    public UserInfo() {
        System.out.println("public UserInfo()");
    }
 
    public UserInfo(long id) {
        super();
        this.id = id;
    }
 
    public UserInfo(long id, String username) {
        super();
        this.id = id;
        this.username = username;
    }
 
    public UserInfo(long id, String username, String password) {
        super();
        this.id = id;
        this.username = username;
        this.password = password;
        System.out.println("public UserInfo(long id, String username, String password)");
        System.out.println(id + " " + username + " " + password);
 
    }
 
    public long getId() {
        return id;
    }
 
    public void setId(long id) {
        this.id = id;
    }
 
    public String getUsername() {
        return username;
    }
 
    public void setUsername(String username) {
        this.username = username;
    }
 
    public String getPassword() {
        return password;
    }
 
    public void setPassword(String password) {
        this.password = password;
    }
 
    public void test() {
        System.out.println("public void test1()");
    }
 
    public void test(String address) {
        System.out.println("public void test2(String address) address=" + address);
    }
 
    public String test(int age) {
        System.out.println("public String test3(int age) age=" + age);
        return "我是返回值";
    }
}

 public static void main(String[] args) throws IOException, ClassNotFoundException {
        //通过类获取Class对象
        Class<UserInfo> aClass1 = UserInfo.class;
        //通过对象获取Class对象
        Class<? extends UserInfo> aClass2 = new UserInfo().getClass();
        //通过类加载器加载全路径获取Class对象
        Class<?> aClass3 = UserInfo.class.getClassLoader().loadClass("org.example.entity.UserInfo");
        //通过静态方法获取类的Class对象
        Class<?> aClass4 = Class.forName("org.example.entity.UserInfo");
        System.out.println(aClass1.hashCode());
        System.out.println(aClass2.hashCode());
        System.out.println(aClass3.hashCode());
        System.out.println(aClass4.hashCode());
    }