The following Program explains basic file reading and writing operations in java

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import java.io.*;
public class FileOperations {

/** Creates a new instance of FileOperations */
public FileOperations() {
}

public static void main(String a[]){
try{
File f1=new File("file");

System.out.println(f1.exists());

System.out.println("path"+f1.getPath());

//writ data


FileOutputStream fStream=new FileOutputStream(f1);
for(int i=65;i<100;i++){
fStream.write(i);
}
fStream.close();
FileInputStream fReader=new FileInputStream(f1);

while(true){
int i1=0;

i1 =fReader.read();
if(i1!=-1){
System.out.println("data"+i1);
}
else{
break;
}
}
fStream.close();
}
catch(Exception e){
e.printStackTrace();
}
}


}