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。

好的，我理解了您的问题。下面是代码实现。

Person类：

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) {
        return this.name.equals(per.name) && this.birthYear == per.birthYear;
    }

    @Override
    public int compareTo(Person per) {
        return this.birthYear - per.birthYear;
    }
}

Account类：

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) {
            balance += value;
            return true;
        }
        return false;
    }

    public double get(double value) {
        if (value > 0 && balance >= value) {
            balance -= value;
            return value;
        }
        return 0;
    }

    @Override
    public int compareTo(Account acc) {
        if (this.balance == acc.balance) {
            return 0;
        } else if (this.balance > acc.balance) {
            return 1;
        } else {
            return -1;
        }
    }

    public static class CompareName implements Comparator<Account> {
        @Override
        public int compare(Account acc1, Account acc2) {
            return acc1.getName().compareTo(acc2.getName());
        }
    }
}

在main方法中测试：

import java.util.Arrays;

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(p1.getAge(2021)); // 输出: 31
        System.out.println(p1.getAge()); // 输出: 当前年龄
        System.out.println(p1.olderThan(p2)); // 输出: -5
        System.out.println(p1.equals(p2)); // 输出: false
        System.out.println(p1.equals(new Person("Tom", 1990))); // 输出: true

        // 测试Account类
        Account a1 = new Account("Tom");
        Account a2 = new Account("Jerry");
        a1.put(1000);
        a2.put(2000);
        System.out.println(a1.getBalance()); // 输出: 1000.0
        System.out.println(a2.getBalance()); // 输出: 2000.0
        System.out.println(a1.get(500)); // 输出: 500.0
        System.out.println(a1.getBalance()); // 输出: 500.0
        System.out.println(a1.compareTo(a2)); // 输出: -1

        // 测试CompareName类
        Account[] accounts = {new Account("Tom"), new Account("Jerry"), new Account("Bob")};
        Arrays.sort(accounts, new Account.CompareName());
        for (Account acc : accounts) {
            System.out.println(acc.getName());
        }
        // 输出: Bob Jerry Tom
    }
}