Added Java File Handling

Author: hackstarsj

src/JavaDeleteFileExample.java

@@ -0,0 +1,14 @@
+import java.io.File;
+
+public class JavaDeleteFileExample {
+    public static void main(String args[]){
+        System.out.println("Delete File Example : ");
+        File file=new File("temp_file.txt");
+        if(file.delete()){
+            System.out.println("File Deleted");
+        }
+        else{
+            System.out.println("Error in Deleting File");
+        }
+    }
+}

src/JavaFileCreateWriteExample.java

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+import java.io.File;
+import java.io.FileWriter;
+import java.util.Scanner;
+
+public class JavaFileCreateWriteExample {
+    public static void main(String args[]){
+        System.out.println("File Handling Write Example : ");
+        File file=new File("temp_file.txt");
+
+        Scanner scanner=new Scanner(System.in);
+
+        //checking file already exist
+        if(file.exists()){
+            System.out.println("File Already Exist!");
+
+            System.out.println("Enter Data to Write in File ");
+            String text_data=scanner.nextLine();
+            try {
+                //For Appending Data to file pass true
+                FileWriter fileWriter = new FileWriter("temp_file.txt",true);
+                //for Adding New Line Added \n
+                fileWriter.write("\n"+text_data);
+                fileWriter.close();
+            }
+            catch (Exception e){
+                System.out.println("Error in Opening File");
+            }
+
+        }
+        else{
+            //creating new file
+            try {
+                file.createNewFile();
+                System.out.println("New File Created");
+                System.out.println("Enter Data to Write in File ");
+                String text_data=scanner.nextLine();
+                try {
+                    FileWriter fileWriter = new FileWriter("temp_file.txt");
+                    fileWriter.write(text_data);
+                    fileWriter.close();
+                }
+                catch (Exception e){
+                    System.out.println("Error in Opening File");
+                }
+
+            }
+            catch (Exception e){
+                System.out.println("Something Went Wrong on Creating New File");
+            }
+        }
+
+    }
+}

src/JavaFileReadExample.java

@@ -0,0 +1,49 @@
+import java.io.File;
+import java.util.Scanner;
+
+public class JavaFileReadExample {
+    public static void main(String args[]){
+        System.out.println("Read File Example : ");
+
+        File file=new File("temp_file.txt");
+        Scanner scannerread=new Scanner(System.in);
+        try {
+            Scanner scanner = new Scanner(file);
+            while (scanner.hasNextLine()){
+                String data=scanner.nextLine();
+                System.out.println(data);
+            }
+
+            System.out.println("File Information : ");
+            System.out.println("Name : "+file.getName());
+            System.out.println("Path : "+file.getAbsolutePath());
+            System.out.println("Parent : "+file.getParent());
+            System.out.println("Writeable : "+file.canWrite());
+            System.out.println("Readable : "+file.canRead());
+            System.out.println("Executeable : "+file.canExecute());
+            System.out.println("Size : "+file.length());
+            System.out.println(file);
+        }
+        catch (Exception e){
+            System.out.println("Something Wrong on Reading File");
+        }
+
+        System.out.println("Do You Want to Delete File ? Yes / No");
+        String input=scannerread.nextLine();
+
+        if(input.equalsIgnoreCase("yes")){
+            if(file.delete()){
+                System.out.println("File Deleted");
+            }
+            else{
+                System.out.println("Error in Deleting File");
+            }
+
+        }
+        else{
+            System.out.println("File Not Deleted");
+        }
+
+
+    }
+}

src/JavaGetAllFileFromDirectories.java

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+import java.io.File;
+
+public class JavaGetAllFileFromDirectories {
+    public static void main(String args[]){
+        System.out.println("Reading File Name from Directory");
+        File file=new File("C:\\Users\\sanjeev\\IdeaProjects\\HelloWorld\\src");
+        String[] filelist=file.list();
+
+        for (String filename:filelist){
+            File file1=new File("C:\\Users\\sanjeev\\IdeaProjects\\HelloWorld\\src\\"+filename);
+            System.out.println("File Name : "+file1.getName()+" Size : "+file1.length()+" Path : "+file1.getAbsolutePath());
+
+        }
+    }
+}

temp_file.txt

@@ -0,0 +1 @@
+Hello Java