Exercise Write a Java application that reads graphical instructions from a file

Question

Exercise Write a Java application that reads graphical instructions from a file called drawing.txt and executes them Detailed Requirement The file drawing.txt may contain any number of instructions; it might even be empty, in which case an appropriate message should be displayed Each line in drawing.txt represents 1 graphical instruction. A graphical instruction has the following format: instruction (parameter1, parameter2, etc.). Your application should first parse the file drawing.txt line by line and indicate all lines that contairn invalid instructions using the following message: "Instruction in line N is not valid ". Once the whole file is parsed, if at least 1 invalid instruction is detected, the program stops with a message "Program stops: Syntax errors detected!!"; otherwise, the instructions will be executed. The list of valid instructions is as follow: move (x, y): translate the current position (xc, yc) by (x, y) (i.e. xc-xc+x; yc-yc+y). setColor (r, g, b): sets the current drawing color to the rgb color (r,g,b); r, g and b should be in the range [0, 255] setBackground(r, g, b): sets the current background color to the rgb color (r.g,b); r, g and b shoulo be in the range [0, 255] Fill(status); status-true/false: if status-true the 2D object will be solid otherwise just line drawing. line(x1, y1, x2, y2): draw a line from (x1+xc, y1+yc) to (x2+xc, y2+yc) rect(x1,y1, w, h): draws a rectangle whose top left corner is (x1+xc, y1+yc) and width and height are (w, h). The rectangle will be solid only if fill status is true oval(x1,y1, x2, y2): draws an oval whose top left corner is (x1+xc, y1+yc) and width and height are (w, h). The oval will be solid only if fill status is true

Explanation / Answer

import java.io.BufferedReader;

import java.io.FileReader;

import java.io.IOException;

public class ReadFileExample1 {

private static String FILENAME = "D:\test.txt";

public static void main(String []args) {

BufferedReader bread = null;

FileReader fread = null;

try {

//br = new BufferedReader(new FileReader(FILENAME));

fread = new FileReader(FILENAME);

bread = new BufferedReader(fread);

String sCurrentLine;

while ((sCurrentLine = bread.readLine()) != null) {

System.out.println(sCurrentLine);

}

} catch (IOException e) {

e.printStackTrace();

} finally {

try {

if (bread != null)

bread.close();

if (fread != null)

fread.close();

} catch (IOException ex) {

ex.printStackTrace();

}

}

}

}

Related Questions

Navigate

• Browse (All)
• Browse E
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.