JAVA IO FileReader

 File file = new File("hello.txt");
        FileReader fileReader = null;
        try{

             fileReader= new FileReader(file);
            int data;
            while((data=fileReader.read())!=-1){
                System.out.print((char)data);
            }
        } catch (IOException e){
            e.printStackTrace();
        }finally {
            if(fileReader!=null){
                try{
                    fileReader.close();
                }catch (IOException e){
                    e.printStackTrace();
                }
            }
        }

File file = new File("hello.txt");
        FileReader fileReader = null;
        try{

            fileReader= new FileReader(file);
            char [] data = new char[5];
            int len=-1;
            while((len=fileReader.read(data))!=-1){
                System.out.print(new String(data,0,len));
            }
        } catch (IOException e){
            e.printStackTrace();
        }finally {
            if(fileReader!=null){
                try{
                    fileReader.close();
                }catch (IOException e){
                    e.printStackTrace();
                }
            }
        }

File file = null;
        file = new File("hi.txt");
        FileWriter fw=null;
        try {
            fw = new FileWriter(file);
            fw.write("hello world");
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            if(fw!=null){
                try{
                    fw.close();
                }catch (IOException e){
                    e.printStackTrace();
                }
            }
        }