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The first call to println() invokes the HashMap.toString() method, printing the entire Map object. The second call to println() invokes the HashMap.size() method, showing that the Map object has six key/value elements. The next call to println() invokes the HashMap.keySet() method, which returns a Set object containing all the keys (the six German words). The next call to println() invokes the HashMap.values() method, which returns a Collection object containing all the values (the six English words). The next call to println() invokes the HashMap.get() method, which returns the value for a given key. This call returns the value object "clock" for the key object "Uhr". The next call to println() invokes the HashMap.remove() method, which deletes the ("Rad","wheel") pair, which is confirmed by the next call: map.get("Rad") returns null, indicating that there is no key/value pair in map whose key is "Rad". The last two lines prints the entire map again and its size, revealing that the ("Rad","wheel") pair has indeed been deleted.

Memory Mapped I/O Most computers of the 1960s, 1970s, and 1980s had a special set of instructions for I/O, and many computers still do With such architecture, reading from a buffer on an interface requires a different instruction than reading from a memory location In one computer architecture, for instance, the I/O instruction to read from the interface in slot 7 is LIA 7, load into the A-register from slot 7 The memory reference instruction to read from memory location 7 is LDA 7, load into the A-register from memory location 7 The instructions LIA and LDA are different LIA is a privileged instruction, available only in privileged mode, and LDA is not; any program can execute LDA In the 1980s the idea of memory-mapped I/O gained currency With memory-mapped I/O, certain memory locations are reserved for reference to the control registers and buffers of the I/O interfaces.

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The order in which the key/value pairs were stored in the HashMap object in Example 8.1 seems to be random and unrelated to the order in which the pairs were inserted. The next example verifies this. EXAMPLE 8.2 Java HashMap Objects Are Hash Tables

This program creates two independent HashMap objects and loads them with the same key/value pairs but in different orders:

Communicating with the controllers becomes as easy as writing to and reading from memory Memory-mapped I/O offers several advantages First, since I/O uses the same instructions as memory references, I/O programs (drivers) can be written entirely in a high-level language Second, protection against issuing I/O commands in user mode can be effected using the memory protection hardware already required for enforcing bounds on a user program s access to memory No special mechanism for detecting the privileged status of I/O commands is required A disadvantage of memory-mapped I/O becomes apparent when the computer design includes separate buses for memory and I/O Since the controllers cannot see the transfers to memory, some mechanism is necessary to intercept reads and writes to I/O mapped-memory locations and pass them off to the I/O bus.

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public class TestHashTable { public static void main(String[] args) { Map map1 = new HashMap(); map1.put("Tor","gate"); map1.put("Rad","wheel"); map1.put("Tag","day"); map1.put("Uhr","clock"); map1.put("Hut","hat"); map1.put("Ohr","ear"); System.out.println("map1=" + map1); Map map2 = new HashMap(); map2.put("Rad","wheel"); map2.put("Uhr","clock"); map2.put("Ohr","ear"); map2.put("Tag","day"); map2.put("Tor","gate"); map2.put("Hut","hat"); System.out.println("map2=" + map2); }

Another disadvantage of memory-mapped I/O is that most modern computers, in order to speed access to memory, use local cache memory to hold the contents of recently accessed memory locations A cache holds a copy of what is in memory in a location closer to the CPU If a driver needs to read the control flag register to learn if the interface is busy, and the contents of the memory location are cached, the driver may never see the device become available Some additional mechanism must be added to provide for selective caching a mechanism that avoids caching of I/O mapped addresses Some computers use both special I/O instructions and memory mapping For instance, the PC architecture uses memory mapping for the transfer of buffers to I/O controllers, and also uses I/O instructions to write to the control registers of the interfaces..

The output is:

map1={Rad=wheel, Uhr=clock, Ohr=ear, Tor=gate, Hut=hat, Tag=day} map2={Rad=wheel, Uhr=clock, Ohr=ear, Tor=gate, Hut=hat, Tag=day} The order in which the key/value pairs are stored in the HashMap table is reflected by the output from the toString() method. That stored order is same in both tables, independent of the order in which they were inserted. Note that it is also the same stored order in the HashMap table in Example 8.1.

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