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Exercise based on day 2 template
More Input and Output example from a Well House Consultants training course
More on More Input and Output [link]
Source code: d3y.java Module: J713
/* QUESTION Using a template ... http://www.wellho.net/resources/ex.php?item=j713/d2x.java Read in the file of stars of stage and screen at stars.txt http://www.wellho.net/data/stars.txt into an array and produce an array of Star objects. Loop through them telling me who is underweight ANSWER */ :::::::::::::: StarHealth.java :::::::::::::: public class StarHealth { public static void main (String [] args) { MyStream FamousPeopleReader = new MyStream(args[0]); Star [] Oscar = new Star[300]; int starCount = 0; String lyne; while ((lyne = FamousPeopleReader.readLine()) != null) { Star current = Star.factory(lyne); if (current != null) { Oscar[starCount++] = current; } } for (int k=0; k<starCount; k++) { Star current = Oscar[k]; if (current.isAnorexic()) { System.out.println(current.name + " " + current.getBmi()); } } } } :::::::::::::: Star.java :::::::::::::: // Anna Kournikova 5 feet 8 inches / 172.72 cms 114.64-125.66 lbs public class Star { String name; float height; float weight; int passengers; public static Star factory(String raw) { String [] pieces = raw.split(" "); Star result = null; try { float height = Float.parseFloat(pieces[7]) / 100.0f ; String [] WeightRange = pieces[9].split("-"); float weight = Float.parseFloat(WeightRange[1]) * 0.453592f; String FullName = pieces[0] + " " + pieces[1]; result = new Star(FullName,height,weight); } catch (Exception e) { System.err.println(e); System.err.println(raw); } return result; } public Star(String name, float height, float weight) { this.name = name; this.height = height; this.weight = weight; } public boolean isAnorexic() { return (this.getBmi() < 19.0f); } public float getBmi() { return weight / height / height; } } :::::::::::::: MyStream.java :::::::::::::: import java.io.*; public class MyStream { BufferedReader Source; String Refname; public MyStream (String name) { Source = null; try { Source = new BufferedReader(new FileReader(name)); Refname = name; } catch (Exception e) { } } public String readLine() { try { return Source.readLine(); } catch (Exception e) { return null; } } } Learn about this subject
This module and example are covered on the following public courses:
* Learning to Program in Java * Java Bootcamp * Java Programming for the Web Also available on on site courses for larger groups Books covering this topic
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other closely related examples on the "More Input and Output" module index page.
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