apndxa.code

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listing 1
/** 
 * This class draws a bar chart. 
 * @author Herbert Schildt 
 * @version 3.2 
*/

listing 2
import java.io.*; 
 
/** 
 * This class demonstrates documentation comments. 
 * @author Herbert Schildt 
 * @version 1.2 
*/ 
public class SquareNum { 
  /** 
   * This method returns the square of num. 
   * This is a multiline description.  You can use 
   * as many lines as you like. 
   * @param num The value to be squared. 
   * @return num squared. 
  */ 
  public double square(double num) { 
    return num * num; 
  } 
 
  /** 
   * This method inputs a number from the user. 
   * @return The value input as a double. 
   * @exception IOException On input error. 
   * @see IOException  
  */ 
  public double getNumber() throws IOException { 
    // create a BufferedReader using System.in 
    InputStreamReader isr = new InputStreamReader(System.in); 
    BufferedReader inData = new BufferedReader(isr); 
    String str; 
 
    str = inData.readLine(); 
    return (new Double(str)).doubleValue(); 
  } 
  /** 
   * This method demonstrates square(). 
   * @param args Unused. 
   * @exception IOException On input error. 
   * @see IOException 
  */ 
 
  public static void main(String args[])  
    throws IOException  
  { 
    SquareNum ob = new SquareNum(); 
    double val; 
 
    System.out.println("Enter value to be squared: "); 
    val = ob.getNumber(); 
    val = ob.square(val); 
 
    System.out.println("Squared value is " + val); 
  } 
}