cw2b.java

samll awt programs for the beginner.

/**
* Author: Jing Han
* Date; 12/11/03
*Module: G6DICp
* Title: ICP Coursework 2
* SCSiT Username: jxh23m
*/



import java.util.*;
import java.io.*;

class cw2b
{
    public static void main(String[] arg)
    {
       
        //prompt for filename
        System.out.print("Enter data file:"+"  ");
        String filename=TButils.readln();
        
        
        String title = "";
        Vector data=new Vector();
        double sum=0;
        Double myDouble;
        double datavalue; 
        
    /*----------------------------------------------------------------------
    *read the file data into title and vector
	*covert string line into int number and get double value of data
	*sum calculation
	*cast double number into Integer and put into vector
 	*---------------------------------------------------------------------*/
	
        try 
        {
            RandomAccessFile inFile=new RandomAccessFile(filename,"r");
            String line; 			
            int lineNo=0;			
            
            /* use the readLine method to read a line into the string line 
	    	*until the end of the file*/
            while((line=inFile.readLine())!=null) 
            {
               
                if( lineNo == 0 )
                {
                    title=line;				
                 }
                 
                 else					
                 {
					String newline=line.trim();          //trim leading spaces from line
                    myDouble=Double.valueOf(newline);    	
                    datavalue=myDouble.doubleValue();	   	
                    sum=sum+datavalue;		  	
                   	data.addElement(myDouble);		
                 }
		  
            
                lineNo++;          
            }
         }
         catch (IOException e)
         {
            System.out.println("An i/o error has occured ["+e+"]");
         }

        
        
         
         System.out.println("Title:"+"  "+title);
         System.out.println();
         System.out.println();

        
      // instatiate new vector angle and delacare new variables
    	Double tmpValue;     		  
 	double value;           		  
	int angleInt;      		  	 
	Double myD;
	double angleDouble;
	Vector angle=new Vector();	 
	
	/*-------------------------------------------------------------------------
	 *cast data in the vector to Integer
	 *get data int value and convert to double 
	*calculate double angle and get the int value of angle
	*cast double angle to Integer and store into new vector
	*--------------------------------------------------------------------------*/
         for(int n=0;n<data.size();n++)
         {
            
               tmpValue=(Double)data.elementAt(n);	
               value=tmpValue.doubleValue();			
               angleDouble=Math.round(360*value/sum);	
               myD=new Double(angleDouble);
	       angleInt=myD.intValue();
	       angle.addElement(new Integer(angleInt));
         
         }
         
         //print out line of words and data 
         {
         	System.out.println("	"+"Data"+"	   "+"Angle(degree)");
	 }
	 
       	 for(int n=0;n<data.size();n++)
	 {
		System.out.println("	"+((Double)data.elementAt(n)).intValue()+"         "+angle.elementAt(n));
	 }
         
         
    }
}//end of class