public void addElement(Object) adds the object which is its argument to the end of the vector in Java

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public void addElement(Object) adds the object which is its argument to the end of the vector
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object to which it sends the message corresponding to this method Notice that the parameter of the method is Object; this means that any objects can be held in a vector
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public int capacity() returns with the capacity of the vector object to which this message is sent
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This integer represents the current upper limit of items that can be stored in the object
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public int size() returns with the current number of objects stored in the vector This is different
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to the capacity: the latter represents the current maximum number of elements which can be contained in the vector before the vector is increased; the former represents the number of items actually stored
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public boolean contains(Object) returns the Boolean value true if the object which is the parameter of the method is currently stored in the vector object which receives the message corresponding to the method
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public int lastIndexOf(object) searches for the object which is the parameter to the method and
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returns an index to it if it is found; however, if it is not found, then it returns the value 1
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public Object firstElement() returns with the first object in the vector object to which the message corresponding to this method is sent
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public void removeElements() removes all the elements from the object to which the message
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corresponding to the method is sent The vector becomes empty These, then, are a small selection of methods which are associated with vectors Before leaving this section it is worth developing some code which involves vectors in order to give you an idea of the power of the class library The example which we shall use is that of a simple message handler which processes messages associated with a computer in a computer network, stores them in a queue associated with input messages and transfers them to an output queue ready for transfer to another computer The class will represent the computer and the two queues as three instance variables: a string variable which is the name of the computer and two vectors which contain the messages that are to be stored in the queues We shall assume that the messages are strings, but will not be concerned with what the semantics of the messages are For the first time in the book we will include program code which checks whether potential error conditions can occur This code will set a parameter of the method depending on whether the error has occurred or whether the processing proceeded normally The header for the class is: Class MessageSwitch { Vector inQ, outQ; String computerName; Let us assume a number of methods are required:
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public String getComputerName() returns with the name of the computer which is carrying out
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the process of switching messages from an input queue to an output queue
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public void sendIn(String String int) adds a message to the input queue of the computer designated by the second parameter The third parameter will be set to zero if the correct computer has been sent the message; otherwise it will be set to 1
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void sendFromInToOut(int String) sends the first message in the input queue of the computer
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specified as the second parameter to the output queue If the method was carried out correctly, then the integer parameter is set to zero However, the parameter is set to 1 if the input queue was empty and set to 2 if the message was sent to the wrong computer
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public String sentOut(String int) returns with the message which is at the front of the output
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queue The queue is readjusted so that this message disappears The string parameter identifies the computer and the int parameter is set to 1 if the output queue is empty and 2 if the wrong computer has been referenced If the method was carried out correctly, then this parameter will be set to zero
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public int noInInQ(String int) returns with the number of items currently stored in the input
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queue of the computer identified by the string parameter If the string parameter does not match the name of the computer then the int parameter is set to 1 If the method was carried out correctly then the parameter is set to zero
public int noInIOutQ(String int) returns with the number of items currently stored in the output
queue of the computer identified by the string parameter If the string parameter does not match the name of the computer, then the int parameter is set to 1 If the method was carried out correctly, then the parameter is set to zero We shall also assume that there is one constructor MessageSwitch(string, int) which sets the computer name and initializes both queues to the value given by its second parameter The code for the method is reproduced below: public MessageSwitch(String computer, int initialSize) { inQ = new Vector(initialSize), outQ = new Vector(initialSize); computerName = computer; } This is fairly straightforward: it uses the Vector(int) constructor associated with the Vector class to initialize the two queues The code for getComputerName() is shown below: public String getComputerName() { return (computerName); } The code for sendIn(String String int) is shown below; again the code is straightforward: public void sendIn(String message, String computer, int errorOccurred) { errorOccurred = 0; if (computer != computerName) errorOccurred = -1; else inQaddElement(message) } This uses the method addElement associated with the Vector class to add an element to the end of inQ The code for sendFromInToOut(int String) is shown below: void sendFromInToOut(int errorOccurred, String computer) { errorOccurred = 0; if (computer != computerName) errorOccurred = -2;
else{ if inQsize() = 0{ errorOccurred = -1; else{ String firstMessage = inQfirstElement(); inQremoveElementAt(1); outQaddElement(firstMessage); } } } The key processing in this method occurs at the end when the first element of the input queue is accessed by sending the firstElement message; this element is then removed by sending the message removeElement and finally the message that has been removed is added to the end of the output queue by sending it the message addElement all of these messages are contained in the Vector class The two methods which interrogate the input and output queues of the class to determine how many items are in each queue are shown below: public int noInInQ(String computer int errorOccurred) { errorOccurred = 0; if (computer != computerName) errorOccurred = -1; return(null); else return (inQsize()); } public int noInOutQ(String computer int errorOccurred) { errorOccurred = 0; if (computer != computerName) errorOccurred = -1; return(null); else return outQsize(); } This gives the full class definition as: Class MessageSwitch { Vector inQ, outQ; string computerName; public MessageSwitch(String computer, int initialSize) { inQ = new Vector(initialSize), outQ = new Vector (initialSize); computerName = computer; } public String getComputerName() { return (computerName); } public void sendIn(String message, computer, int errorOccurred) { errorOccurred = 0; if (computer != computerName) errorOccurred = -1;
else inQaddElement(message) } void sendFromInToOut(int errorOccurred, String computer) { errorOccurred = 0; if (computer != computerName) errorOccurred = -2; else{ if inQ size() == 0 { errorOccurred = -1; else{ String firstMessage = inQfirstElement(); inQremoveElementAt(1); outQaddElement(firstMessage); } } } public int noInInQ(String computer int errorOccurred){ errorOccurred = 0; if (computer != computerName) errorOccurred = -1; return(null); else return (inQsize()); } public int noInOutQ(string computer int errorOccurred) { errorOccurred = 0; if (computer != computerName) errorOccurred = -1; return(null); else return outQsize(); } }