Initial commit

.idea/.gitignore

+# Default ignored files
+/shelf/
+/workspace.xml

.idea/misc.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_11" default="true" project-jdk-name="11" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>
\ No newline at end of file

.idea/modules.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/Workshop 7.iml" filepath="$PROJECT_DIR$/Workshop 7.iml" />
+    </modules>
+  </component>
+</project>
\ No newline at end of file

Workshop 7.iml

+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>
\ No newline at end of file

src/Car.java

+import java.io.BufferedWriter;
+import java.io.IOException;
+
+public class Car implements FileWriteable{
+    private String model;
+    private String colour;
+
+    public void writeToFile(BufferedWriter writer) throws IOException {
+
+    }
+}

src/Database.java

+import java.io.BufferedWriter;
+import java.io.FileWriter;
+import java.io.IOException;
+
+public class Database {
+    private FileWriteable[] object=new FileWriteable[100];
+    private static int numobject=0;
+
+    public Database() {
+    }
+
+    public void addobject(FileWriteable input){
+        object[numobject++]=input;
+    }
+
+    public void removeobject(FileWriteable input){
+        for (int n=0;n<numobject;n++){
+            if (object[n].equals(input)){
+                for (int j=n;j<numobject;j++){
+                    object[j]=object[j+1];
+                }
+            }
+            }
+        numobject--;
+    }
+   public void writeAll(String filename) throws IOException {
+       BufferedWriter bw =
+               new BufferedWriter(new FileWriter(filename));
+       for (int n=0;n<numobject;n++){
+            object[n].writeToFile(bw);
+        }
+   }
+    public static void main(String[] args) throws IOException {
+        Point pointa=new Point(2.1,2.3);
+        Database data=new Database();
+        data.addobject(pointa);
+        data.writeAll("ABC.txt");
+    }
+}

src/FileWriteable.java

+import java.io.BufferedWriter;
+import java.io.IOException;
+
+public interface FileWriteable {
+    void writeToFile(BufferedWriter writer) throws IOException;
+
+}

src/Point.java

+import java.io.BufferedWriter;
+import java.io.IOException;
+
+public class Point implements FileWriteable{
+    private double x;
+    private double y;
+
+    public Point(double x, double y) {
+        this.x = x;
+        this.y = y;
+    }
+
+    public void writeToFile(BufferedWriter writer) throws IOException {
+
+
+    }
+}
+

src/Student.java

+import java.io.BufferedWriter;
+import java.io.IOException;
+import java.util.Objects;
+
+public class Student implements FileWriteable {
+    private int id;
+    private String name;
+
+    public void writeToFile(BufferedWriter writer) throws IOException {
+
+    }
+
+
+}