Add files via upload

section8/Circle.java

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+public class Circle {
+    private double radius;
+
+    public Circle() {
+        this(1.0);
+    }//no arg ctor
+
+    public Circle(double radius) {
+        this.radius = radius;
+    }//end ctor
+
+    public double getRadius() {
+        return radius;
+    }//end getRadius
+
+    public void setRadius(double radius) {
+        this.radius = radius;
+    }//end setRadius
+
+    public double circumference() {
+        return 2 * Math.PI * radius;
+    }//end circumference
+
+    public double area() {
+        return Math.PI * Math.pow(radius, 2);
+    }//end area
+}//end Circle class
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section8/FileInputFun.java

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+import java.io.File;
+import java.io.FileNotFoundException;
+import java.util.InputMismatchException;
+import java.util.Scanner;
+
+public class FileInputFun {
+    public static void main(String[] args) {
+        Scanner infile;
+
+
+        try {
+            infile = new Scanner(new File("input.txt"));
+            int input;
+            int sum = 0;
+
+            while(infile.hasNext()) {
+                input = infile.nextInt();
+                System.out.println(input);
+                sum += input;   //sum = sum + input
+            }//end while
+
+            System.out.println("Sum is " + sum);
+            infile.close();
+        }
+        catch(FileNotFoundException ex) {
+            System.out.println("Can't find file!");
+            System.out.println(ex.getMessage());
+        }//end try-catch
+        catch(InputMismatchException ex) {
+            System.out.println("Error reading input!");
+        }
+    }//end main
+}

section8/FileOutputFun.java

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+import java.io.FileNotFoundException;
+import java.io.PrintWriter;
+
+public class FileOutputFun {
+    public static void main(String[] args) {
+
+        try {
+            PrintWriter pw = new PrintWriter("output.txt");
+
+            pw.println("Hello there");
+            pw.println("My name is John Baugh!");
+            pw.close();
+        }
+        catch(FileNotFoundException ex) {
+            System.out.println("Couldn't write to the file!");
+        }//end try-catch
+    }//end main
+}

section8/NamesAges.java

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+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.PrintWriter;
+import java.util.Scanner;
+
+public class NamesAges {
+    public static void main(String[] args) {
+        Scanner namesFile;
+        Scanner agesFile;
+        PrintWriter pw;
+
+        try {
+            namesFile = new Scanner(new File("student_names.txt"));
+            agesFile = new Scanner(new File("student_ages.txt"));
+            pw = new PrintWriter("names_ages.txt");
+
+            String tempName;
+            int tempAge;
+
+            while(namesFile.hasNext()) {
+                tempName = namesFile.nextLine();
+                tempAge = agesFile.nextInt();
+
+                pw.println(tempName + " is " + tempAge + " years old.");
+            }//end while
+
+            namesFile.close();
+            agesFile.close();
+            pw.close();
+        }
+        catch(FileNotFoundException ex) {
+            System.out.println(ex.getMessage());
+        }//end try-catch
+    }//end main
+}

section8/Proj8_1_RectangleFile.java

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+import java.io.File;
+import java.io.FileNotFoundException;
+import java.util.ArrayList;
+import java.util.Scanner;
+
+public class Proj8_1_RectangleFile {
+    public static void main(String[] args) {
+        ArrayList<Rectangle> rectangleList;
+        rectangleList = new ArrayList<>();
+
+        fillArrayList(rectangleList);
+        printRectangles(rectangleList);
+
+    }//end main
+
+    public static void fillArrayList(ArrayList<Rectangle> rectangleAL) {
+        Scanner infile;
+
+        try {
+            infile = new Scanner(new File("rectangle_data.txt"));
+            Rectangle temp;
+            double length;
+            double width;
+
+            while(infile.hasNext()) {
+                length = infile.nextDouble();
+                width = infile.nextDouble();
+                temp = new Rectangle(length, width);
+                rectangleAL.add(temp);
+            }//end while
+
+            infile.close();  //close the file!
+        }
+        catch(FileNotFoundException ex) {
+            System.out.println("Error accessing file!");
+        }//end try-catch
+    }//end fillArrayList
+
+    public static void printRectangles(ArrayList<Rectangle> rectangleAL) {
+        for(Rectangle r : rectangleAL) {
+            System.out.println("Length: " + r.getLength());
+            System.out.println("Width: " + r.getWidth());
+            System.out.println("Area: " + r.area());
+            System.out.println("Perimeter: " + r.perimeter());
+            System.out.println();
+        }//end for
+    }//end printRectangles
+}
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section8/Proj8_2_CircleFile.java

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+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.PrintWriter;
+import java.util.ArrayList;
+import java.util.Scanner;
+
+public class Proj8_2_CircleFile {
+    public static void main(String[] args) {
+        ArrayList<Circle> circleList;
+        circleList = new ArrayList<>();
+
+        fillArrayList(circleList);
+        printCircles(circleList);
+
+    }//end main
+
+    private static void fillArrayList(ArrayList<Circle> circleAL) {
+        Scanner infile;
+
+        try {
+            infile = new Scanner(new File("circle_data.txt"));
+            Circle temp;
+            double radius;
+
+            while(infile.hasNext()) {
+                radius = infile.nextDouble();
+                temp = new Circle(radius);
+                circleAL.add(temp);
+            }//end while
+
+            infile.close();
+        }
+        catch(FileNotFoundException ex) {
+            System.out.println("Error accessing file!");
+        }//end try-catch
+    }//end fillArrayList
+
+    private static void printCircles(ArrayList<Circle> circleAL) {
+        PrintWriter pw;
+
+        try {
+            pw = new PrintWriter("circles_output.txt");
+            for(Circle c : circleAL) {
+                System.out.println("Radius: " + c.getRadius());
+                System.out.println("Circumference: " + c.circumference());
+                System.out.println("Area: " + c.area());
+                System.out.println();
+
+                pw.println("Radius: " + c.getRadius());
+                pw.println("Circumference: " + c.circumference());
+                pw.println("Area: " + c.area());
+                pw.println();
+            }//end for
+
+            pw.close();
+        }
+        catch(FileNotFoundException ex) {
+            System.out.println("Couldn't access file.");
+        }//end try-catch
+    }//end printCircles
+}
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section8/Rectangle.java

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+
+public class Rectangle {
+    private double length;
+    private double width;
+
+    private static int numRectangles;
+
+    public Rectangle() {
+        this(1.0, 1.0);
+    }//end no-arg ctor
+
+    public Rectangle(double length, double width) {
+        this.length = length;
+        this.width = width;
+        numRectangles++;
+    }//end ctor
+
+    public double getLength() {
+        return length;
+    }
+
+    public double getWidth() {
+        return width;
+    }
+
+    public void setLength(double length) {
+        this.length = length;
+    }
+
+    public void setWidth(double width) {
+        this.width = width;
+    }
+
+    public double area() {
+        return length * width;
+    }
+
+    public double perimeter() {
+        return 2 * length + 2 * width;
+    }
+
+    public static int getNumRectangles() {
+        return numRectangles;
+    }
+
+}

section8/TwiceData.java

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+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.PrintWriter;
+import java.util.Scanner;
+
+public class TwiceData {
+    public static void main(String[] args) {
+        Scanner infile;
+        PrintWriter pw;
+
+        try {
+            infile = new Scanner(new File("nums.txt"));
+            pw = new PrintWriter("twice_nums.txt");
+
+            int inputNum;
+
+            while(infile.hasNext()) {
+                inputNum = infile.nextInt();
+                inputNum *= 2;  //multiply by 2
+                pw.println(inputNum);
+            }//end while
+
+            infile.close();
+            pw.close();
+        }
+        catch(FileNotFoundException ex) {
+            System.out.println(ex.getMessage());
+        }//end try-catch
+    }//end main
+}

section8/WriteNames.java

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+import java.io.FileNotFoundException;
+import java.io.PrintWriter;
+import java.util.ArrayList;
+
+public class WriteNames {
+    public static void main(String[] args) {
+        ArrayList<String> names = new ArrayList<>();
+
+        names.add("Samantha");
+        names.add("John");
+        names.add("Kyle");
+        names.add("Heather");
+        names.add("Luke");
+
+        try {
+            PrintWriter pw = new PrintWriter("names.txt");
+            for(String name : names) {
+                pw.println(name);
+            }//end for
+
+            pw.close();
+        }
+        catch(FileNotFoundException ex) {
+            System.out.println("Can't write to file!");
+        }
+    }//end main
+}