用Java编写在1.为Person类增加以下方法： （1）int getAge(int year) //返回在year年的年龄 （2）int getAge() //返回今年的年龄，重载 （3）int olderThen(Person per) //返回this与per //的年龄差值，按年龄比较对象大小 （4）boolean equals(Person per) //比较this与 // per引用实例对应成员变量值是否相等 2. 实现银行账户类构造方法成成员方法。 public class Account //账户类 { private String name; //储户姓名 private double balance; //账户余额 public Account(String name) //构造方法 public String getName() //返回账户名 public double balance() //查看账户余额 public boolean put(double value)//存款，存入金额 public double get(double value) //取款，参数为取款金额，返回实际取到金额 }的基础上，声明实现Comparble<T>接口，提供按照账户余额比较账户大小的方法；同时，使用Comparator<T>接口声明比较器类CompareName,按照账户名比较账户大小；编写main方法测试相应的接口实现方法。

下面是Java代码实现： 1. Person类： ```java public class Person implements Comparable<Person> { private String name; private int birthYear; public Person(String name, int birthYear) { this.name = name; this.birthYear = birthYear; } public int getAge(int year) { return year - birthYear; } public int getAge() { return getAge(Calendar.getInstance().get(Calendar.YEAR)); } public int olderThan(Person per) { return this.birthYear - per.birthYear; } public boolean equals(Person per) { if (this == per) { return true; } if (per == null) { return false; } return this.name.equals(per.name) && this.birthYear == per.birthYear; } @Override public int compareTo(Person per) { return Integer.compare(this.birthYear, per.birthYear); } } ``` 2. Account类： ```java import java.util.Comparator; public class Account implements Comparable<Account> { private String name; private double balance; public Account(String name) { this.name = name; this.balance = 0; } public String getName() { return name; } public double getBalance() { return balance; } public boolean put(double value) { if (value <= 0) { return false; } balance += value; return true; } public double get(double value) { if (value <= 0 || balance < value) { return 0; } balance -= value; return value; } @Override public int compareTo(Account acc) { return Double.compare(this.balance, acc.balance); } public static class CompareName implements Comparator<Account> { @Override public int compare(Account acc1, Account acc2) { return acc1.name.compareTo(acc2.name); } } } ``` 3. 测试代码： ```java import java.util.ArrayList; import java.util.Collections; import java.util.List; public class Main { public static void main(String[] args) { // 测试Person类 Person p1 = new Person("Tom", 1990); Person p2 = new Person("Jerry", 1995); System.out.println("Tom's age in 2021: " + p1.getAge(2021)); System.out.println("Jerry's age in 2021: " + p2.getAge(2021)); System.out.println("Tom's age: " + p1.getAge()); System.out.println("Jerry's age: " + p2.getAge()); System.out.println("Tom older than Jerry: " + p1.olderThan(p2)); System.out.println("Tom equals Jerry: " + p1.equals(p2)); // 测试Account类 List<Account> accounts = new ArrayList<>(); Account acc1 = new Account("Tom"); acc1.put(1000); accounts.add(acc1); Account acc2 = new Account("Jerry"); acc2.put(2000); accounts.add(acc2); Account acc3 = new Account("Alice"); acc3.put(1500); accounts.add(acc3); // 按照余额排序 System.out.println("Sort by balance:"); Collections.sort(accounts); for (Account acc : accounts) { System.out.println(acc.getName() + " " + acc.getBalance()); } // 按照账户名排序 System.out.println("Sort by name:"); Collections.sort(accounts, new Account.CompareName()); for (Account acc : accounts) { System.out.println(acc.getName() + " " + acc.getBalance()); } } } ```