FileReader && FileInputStream

package test.file;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class ReaderTest {
public static void main(String[] args) {
System.out.println(System.currentTimeMillis());
//==============================
//	FileReader
//==============================
System.err.println("--------------------------------");
try {
FileReader fr = new FileReader("e://system.txt");
//			char[] buffer = new char[1024];
int ch = 0;
while ((ch = fr.read()) != -1) {
System.out.print((char) ch);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}

//==============================
//	FileReader -> BufferedReader/readLine
//==============================
System.err.println("--------------------------------");
try {
FileReader fr = new FileReader("e://system.txt");
BufferedReader br = new BufferedReader(fr);
String data = null;
while((data = br.readLine())!=null){
System.out.println(data);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}

//==============================
//	InputStreamReader
//==============================
System.err.println("--------------------------------");
try {
InputStreamReader isr = new InputStreamReader(new FileInputStream("e://system.txt"));
int ch = 0;
while((ch = isr.read())!=-1){
System.out.print((char)ch);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}

//==============================
//	InputStreamReader -> BufferedReader/readLine
//==============================
System.err.println("--------------------------------");
try {
BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream("e://system.txt")));
String data = null;
while((data = br.readLine())!=null){
System.out.print(data);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}///:~