1. public interface Collection
   {
   	public boolean isFull();
   	public boolean add(Object obj);
   	public boolean isIn(Object obj);
   }
   

2. public class myCollect implements Collection
   {
   	Object[] elements;
   	private int numElements;
   	public myCollect()
   	{
   		elements = new Object[100];
   		numElements = 0;
   	}
   	public boolean isFull()
   	{
   		if (numElements == elements.length)
   			return true;
   		return false;
   	}
   	public boolean add(Object newObj)
   	{
   		if (this.isFull())
   			return false;
   		elements[numElements] = newObj;
   		numElements++;
   		return true;
   	}
      	public boolean isIn(Object obj)
   	{
   		for (int i = 0 ; i < numElements ; i++)
   			if (elements[i].equals(obj))
   				return true;
   		return false;
   	}
   }
   

3. public static boolean addSomething(Collection col, Object addit) {
           PrintWriter stdout = new PrintWriter(System.out,true);
           boolean ok;
           ok = col.add(addit);
           if (!ok)
   	        stdout.println("Error, collection is full");
           return ok;	
   }
   

4. 1. Arithmetic Error
      

   2. string error
      Error in number format
      Done with A
      

   3. Error in number format
      Done with A
      

   4. Error occurred: java.lang.ArrayIndexOutOfBoundsException
      

   5. array error
      Error in number format
      Done with A
      

5. public static void split(String infile,String outfile) {
           PrintWriter stdout = new PrintWriter(System.out,true);
           try {
               PrintWriter fileout = new PrintWriter(new FileWriter(outfile),true);
               BufferedReader filein = new BufferedReader(new FileReader(infile));
               String instr;
               int num;
               StringTokenizer stok;
               while ((instr = filein.readLine()) != null) {
                   stok = new StringTokenizer(instr);
                   while (stok.hasMoreTokens())
                   {
                       num = Integer.parseInt(stok.nextToken());
                       fileout.println(num);
                   }
               }
               fileout.close();
           } catch (IOException ioe)
           {
               stdout.println("Exception occurred in split: " + ioe);
               System.exit(-1);
           }
   }
   

6. public class InOutDouble
   {
       public static void main(String[] args)
       {
           PrintWriter stdout = new PrintWriter(System.out,true);
           String instr;
           try
           {
               BufferedReader filein = new BufferedReader(new FileReader(args[0]));
               instr = filein.readLine();
   //  loop till EOF (readLine returns null on EOF)
               while (instr != null) {
                   try {
                       double dnum = new Double(instr).doubleValue();
                       stdout.println(dnum);
                   }
                   catch(NumberFormatException e) { }
                   instr = filein.readLine();
               }
           }
           catch(FileNotFoundException e) {
               stdout.println("File " + args[0] + " not found");
           }
           catch(IOException e) {
               stdout.println("I/O Error");
           }
       }
   
   }
   

   
   

7. import java.io.*;
   import java.util.Vector;
   import java.util.StringTokenizer;
   
   public class WordsPrint
   {
       public static void main(String[] args)
       {
           String word;
           String line;
       	Vector allWords = new Vector();
   	StringTokenizer lineWords;
           PrintWriter stdout = new PrintWriter(System.out,true);
       	try
   	{
       	    BufferedReader filein = new BufferedReader(
   		                                 new FileReader("words.in"));
     	    line = filein.readLine();
               while (line != null)
   	    {
           	lineWords = new StringTokenizer(line);
           	while (lineWords.hasMoreTokens())
           	{
           	    word = lineWords.nextToken();
           	    allWords.addElement(word);
           	}
     	        line = filein.readLine();
     	    }
       	}
   	catch(IOException e)
       	{
   	    stdout.println("IO Error occurred");
   	    System.exit(-1);
       	}
       	stdout.println("Words that contain b or B:");
       	for (int i = 0 ; i < allWords.size() ; i++)
       	{
       	    word = (String) allWords.elementAt(i);
       	    if (word.indexOf('b') != -1 || word.indexOf('B') != -1)
       	        stdout.println(word);
       	}
       	stdout.println("Words that end in s:");
       	for (int i = 0 ; i < allWords.size() ; i++)
       	{
       	    word = (String) allWords.elementAt(i);
       	    if (word.endsWith("s"))
       	        stdout.println(word.substring(0,word.length()-1));
       	}
       }
   }
   

   
   

Email Me | Office Hours | My Home Page | Department Home | MCC Home Page