有关关闭Java中数据库连接的后续问题

Connection conn = DriverManager.getConnection(
     "jdbc:somejdbcvendor:other data needed by some jdbc vendor",
     "myLogin",
     "myPassword" );

Statement stmt = conn.createStatement();
try {
    stmt.executeUpdate( "INSERT INTO MyTable( name ) VALUES ( 'my name' ) " );
} finally {
    //It's important to close the statement when you are done with it
    stmt.close();
}
conn.close();

我知道conn.close（）是必需的，但不知道为什么。一旦方法调用结束，垃圾收集器是否会释放连接对象（并释放连接对象中存储的所有指向数据库的处理程序）？