Java Reference
In-Depth Information
public V remove(Object key) (Optional)
Removes the mapping for the specifi ed key. If the key is not found in the map, then null is
returned, otherwise the previous value for the key is returned.
Throws:
ClassCastException if the type of key is incompatible with the type for this map (optional).
NullPointerException if the key is null and this map does not permit null keys (optional).
UnsupportedOperationException if the remove operation is not supported by this
map (optional).
ObjectInputStream
Package: java.io
The FileInputStream class is also in this package.
Ancestor classes:
Object
|
+--InputStream
|
+--ObjectInputStream
public ObjectInputStream(InputStream streamObject)
There is no constructor that takes a fi le name as an argument. If you want to create a stream
using a fi le name, use
new ObjectInputStream( new FileInputStream( File_Name ))
Alternatively, you can use an object of the class File in place of the File_Name , as follows:
new ObjectInputStream( new FileInputStream( File_Object ))
The constructor for FileInputStream may throw a FileNotFoundException , which is a
kind of IOException . If the FileInputStream constructor succeeds, then the constructor for
ObjectInputStream may throw a different IOException .
public void close() throws IOException
Closes the stream's connection to a fi le.
public boolean readBoolean() throws IOException
Reads a boolean value from the input stream and returns that boolean value. If readBoolean
tries to read a value from the fi le and that value was not written using the method
writeBoolean of the class ObjectOutputStream (or written in some equivalent way), then
problems will occur.
If an attempt is made to read beyond the end of the fi le, an EOFException is thrown.
 
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