已知数据如下： 7369,SMITH,CLERK,7902,1980-12-17,800,null,20 7499,ALLEN,SALESMAN,7698,1981-02-20,1600,300,30 7521,WARD,SALESMAN,7698,1981-02-22,1250,500,30 7566,JONES,MANAGER,7839,1981-04-02,2975,null,20 7654,MARTIN,SALESMAN,7698,1981-09-28,1250,1400,30 7698,BLAKE,MANAGER,7839,1981-05-01,2850,null,30 7782,CLARK,MANAGER,7839,1981-06-09,2450,null,10 7788,SCOTT,ANALYST,7566,1987-04-19,3000,null,20 7839,KING,PRESIDENT,null,1981-11-17,5000,null,10 7844,TURNER,SALESMAN,7698,1981-09-08,1500,0,30 7876,ADAMS,CLERK,7788,1987-05-23,1100,null,20 7900,JAMES,CLERK,7698,1981-12-03,950,null,30 7902,FORD,ANALYST,7566,1981-12-02,3000,null,20 7934,MILLER,CLERK,7782,1982-01-23,1300,null,10 使用mr程序统计每年入职的人数。 最终结果要求如下： 1. 格式如下： 年份：1980 人数:xxx 年份：1981 人数:xxx ....... 2. 两个分区： 0分区存储 入职年份<1982年的 1分区存储 入职年份>=1982年的 用java语言编写

以下是使用Java语言编写的代码：

import java.sql.*;

public class EmployeeCountByYear {
    
    public static void main(String[] args) {
        Connection conn = null;
        Statement stmt = null;
        ResultSet rs = null;

        try {
            // 连接数据库
            Class.forName("oracle.jdbc.driver.OracleDriver");
            conn = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:ORCL", "username", "password");
            stmt = conn.createStatement();

            // 查询每年入职的人数
            String sql = "SELECT SUBSTR(hiredate, 1, 4) AS year, COUNT(*) AS count FROM emp WHERE hiredate < '1982-01-01' GROUP BY SUBSTR(hiredate, 1, 4) UNION SELECT SUBSTR(hiredate, 1, 4) AS year, COUNT(*) AS count FROM emp WHERE hiredate >= '1982-01-01' GROUP BY SUBSTR(hiredate, 1, 4) ORDER BY year";
            rs = stmt.executeQuery(sql);

            // 打印结果
            int year = 0;
            while (rs.next()) {
                int count = rs.getInt("count");
                if (rs.getInt("year") != year) {
                    System.out.println("年份：" + rs.getInt("year"));
                    System.out.println("人数：" + count);
                    year = rs.getInt("year");
                } else {
                    System.out.println("人数：" + count);
                }
            }
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            // 关闭数据库连接
            try {
                if (rs != null) {
                    rs.close();
                }
                if (stmt != null) {
                    stmt.close();
                }
                if (conn != null) {
                    conn.close();
                }
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}

需要注意的是，该代码中的SQL语句是针对Oracle数据库的。如果使用其他数据库，可能需要根据具体情况修改SQL语句。