User 클래스

public class User {
	private int userNo;
	private String id;
	private String email;
	public int getUserNo() {
		return userNo;
	}
	public void setUserNo(int userNo) {
		this.userNo = userNo;
	}
	public String getId() {
		return id;
	}
	public void setId(String id) {
		this.id = id;
	}
	public String getEmail() {
		return email;
	}
	public void setEmail(String email) {
		this.email = email;
	}
	@Override
	public String toString() {
		return "User [userNo=" + userNo + ", id=" + id + ", email=" + email + "]";
	}	
}

Main 클래스

public class Main {
	public static void main(String[] args) {
		// Bean - 값을 가지고 있는 객체
		User user = new User();
		user.setUserNo(1);
		user.setId("admin");
		user.setEmail("admin@naver.com");
		System.out.println(user);
	}
}

출력:
User [userNo=1, id=admin, email=admin@naver.com]