HOW TO READ A TEXT FILE?

import java.io.*;
class demo
{
public static void main(String[] args)throws Exception{
FileReader fr=new FileReader("hi.txt");
char arr[]=new char[50];
fr.read(arr);
for(char c:arr)
{System.out.print(c);}
fr.close();
}};

import java.io.*;
class demo
{
public static void main(String[] args)throws Exception{
BufferedReader br=new BufferedReader(new FileReader("hi.txt"));
System.out.println(br.readLine());
br.close();
}};

import java.io.*;
class demo
{
public static void main(String[] args)throws Exception{
int i;
FileInputStream fin=new FileInputStream("hi.txt");
do{
i=fin.read();
if(i!= -1)System.out.print((char)i);}
while(i!=-1);
fin.close();
}};

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