public class Dog {private String name;private String color;private int age;public Dog(String name, String color, int age) {this.name = name;this.color = color;this.age = age;}public void print() {System.out.print("名字： " + this.name + "\n" + "颜色：" + this.color + "\n"+ "年龄：" + this.age);}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getColor() {return color;}public void setColor(String color) {this.color = color;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}}

public class User {private String name;private String password;private static int num;public User() {num++;}public User(String name) {this.name = name;num++;}public User(String name, String password) {this.name = name;this.password = password;num++;}public void print() {System.out.print("用户个数：" + num + "\n");System.out.println("名字： " + name + "\t" + "口令：" + password + "\n");}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}}