in java only . Complete writing the method getLargestPerimeterMultipleFiles that
ID: 3879914 • Letter: I
Question
in java only .
Complete writing the method getLargestPerimeterMultipleFiles that has no parameters. This method creates a DirectoryResource (so you can select multiple files) and then iterates over these files. For each File f, it converts the file into a FileResource with the line FileResource fr = new FileResource(f); Then it creates a Shape from the FileResource and calculates the shapes perimeter. What else does it need to do? It needs to return the the largest perimeter over all the shapes in the files you have selected.
Explanation / Answer
import java.io.File;
public class PerimeterAssignmentRunner {
public int getNumPoints (Shape s) {
int numPoints =0 ;
//Point somePoint = s.getPoints();
for (Point somePoint : s.getPoints()){
numPoints += 1;
}
return numPoints;
}
public double getAverageLength(Shape s) {
int points = getNumPoints(s);
perimeterRunnerAssignment pr = new perimeterRunnerAssignment();
double totalPerim = pr.getPerimeter(s);
double avgLength = totalPerim / points;
return avgLength;
}
public double getLargestSide(Shape s) {
//perimeterRunnerAssignment pr = new perimeterRunnerAssignment();
double longestSide = 0.0;
Point prevPt = s.getLastPoint();
for (Point currPt : s.getPoints()) {
double currDist = prevPt.distance(currPt);
if (currDist > longestSide) {
longestSide = currDist;
}
prevPt = currPt;
}
return longestSide;
}
public double getLargestX(Shape s) {
double largestX = -1000.0;
for(Point currPt : s.getPoints()){
double currX = currPt.getX();
if(currX > largestX){
largestX = currX;
}
}
return largestX;
}
public double getLargestPerimeterMultipleFiles() {
DirectoryResource dr = new DirectoryResource();
double largestPerim = 0.0;
perimeterRunnerAssignment pr = new perimeterRunnerAssignment();
for (File f : dr.selectedFiles()) {
FileResource fr = new FileResource(f);
Shape s = new Shape(fr);
double eachPerim = pr.getPerimeter(s);
if(eachPerim > largestPerim){
largestPerim = eachPerim;
}
}
return largestPerim;
}
public String getFileWithLargestPerimeter() {
DirectoryResource dr = new DirectoryResource();
double largestPerim = 0.0;
File thisFile = null;
perimeterRunnerAssignment pr = new perimeterRunnerAssignment();
for (File f : dr.selectedFiles()){
FileResource fr = new FileResource(f);
Shape s = new Shape(fr);
double eachPerim = pr.getPerimeter(s);
if(eachPerim > largestPerim){
largestPerim = eachPerim;
thisFile = f;
}
}
File temp = thisFile; // replace this code
return temp.getName();
}
public void testPerimeterMultipleFiles() {
double largestPerim = getLargestPerimeterMultipleFiles();
System.out.println("largest perimeter among shapes = " + largestPerim);
}
public void testFileWithLargestPerimeter() {
String fileWithLargestPerim = getFileWithLargestPerimeter();
System.out.println("file with largest perimeter = " + fileWithLargestPerim);
}
// This method creates a triangle that you can use to test your other methods
public void triangle(){
Shape triangle = new Shape();
triangle.addPoint(new Point(0,0));
triangle.addPoint(new Point(6,0));
triangle.addPoint(new Point(3,6));
for (Point p : triangle.getPoints()){
System.out.println(p);
}
perimeterRunnerAssignment pr = new perimeterRunnerAssignment();
double peri = pr.getPerimeter(triangle);
System.out.println("perimeter = "+peri);
}
// This method prints names of all files in a chosen folder that you can use to test your other methods
public void printFileNames() {
DirectoryResource dr = new DirectoryResource();
for (File f : dr.selectedFiles()) {
System.out.println(f);
}
}
public static void main (String[] args) {
perimeterRunnerAssignment pr = new perimeterRunnerAssignment();
pr.testPerimeter();
}
}
--------------------------------------------------------------------------------------------------
import java.io.File;
public class perimeterRunnerAssignment {
public double getPerimeter (Shape s) {
// Start with totalPerim = 0
double totalPerim = 0.0;
// Start wth prevPt = the last point
Point prevPt = s.getLastPoint();
// For each point currPt in the shape,
for (Point currPt : s.getPoints()) {
// Find distance from prevPt point to currPt
double currDist = prevPt.distance(currPt);
// Update totalPerim by currDist
totalPerim = totalPerim + currDist;
// Update prevPt to be currPt
prevPt = currPt;
}
// totalPerim is the answer
return totalPerim;
}
public void testPerimeter () {
FileResource fr = new FileResource();
Shape s = new Shape(fr);
double length = getPerimeter(s);
PerimeterAssignmentRunner pr = new PerimeterAssignmentRunner();
int points = pr.getNumPoints(s);
double longestSide = pr.getLargestSide(s);
double largestX = pr.getLargestX(s);
double avgLength = pr.getAverageLength(s);
System.out.println("perimeter = " + length);
System.out.println("number of points = " + points);
System.out.println("longest side = " + longestSide);
System.out.println("largest X = " + largestX);
System.out.println("avgLength = " + avgLength);
}
public static void main (String[] args) {
perimeterRunnerAssignment pr = new perimeterRunnerAssignment();
pr.testPerimeter();
}
}
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