Arq.java

import java.io.*;
import java.*;
import java.util.Formatter;
import java.util.Scanner;
import java.io.File;
import java.nio.charset.*;

public class Arq
{
   private static boolean write = false;
   private static boolean read = false;
   private static Formatter saida = null;
   private static Scanner entrada = null;

	public static boolean openWrite(String nomeArq) {
      boolean resp = false;

      close();

		try{
		   saida = new Formatter(nomeArq);
         resp = write = true;
		}  catch (Exception e) {}

      return resp;
   }

	public static boolean openWrite(String nomeArq, String charset) {
      boolean resp = false;

      close();

		try{
		   saida = new Formatter(nomeArq, charset);
         resp = write = true;
		}  catch (Exception e) {}

      return resp;
   }

	public static boolean openRead(String nomeArq) {
      boolean resp = false;

      close();

		try{
         entrada = new Scanner(new File(nomeArq));
         resp = read = true;
		}  catch (Exception e) {}

      return resp;
   }

	public static boolean openRead(String nomeArq, String charset) {
      boolean resp = false;

      close();

		try{
         entrada = new Scanner(new File(nomeArq), charset);
         resp = read = true;
		}  catch (Exception e) {}

      return resp;
   }

	public static void close() {
      if(write == true){
         saida.close();
         write = false;
      }
      if(read == true){
         entrada.close();
         read = false;
      }
	}

   public static void print(int x){
      if(write == true){
		   saida.format( "%d", x);
      }
   }

   public static void print(double x){
      if(write == true){
	   	saida.format( "%f", x);
      }
   }

   public static void print(String x){
      if(write == true){
   		saida.format( "%s", x);
      }
   }

   public static void print(boolean x){
      if(write == true){
		   saida.format( "%s", ((x) ? "true" : "false"));
      }
   }

   public static void print(char x){
      if(write == true){
	   	saida.format( "%c", x);
      }
   }

   public static void println(int x){
      if(write == true){
   		saida.format( "%d\n", x);
      }
   }

   public static void println(double x){
      if(write == true){
		   saida.format( "%f\n", x);
      }
   }

   public static void println(String x){
      if(write == true){
	   	saida.format( "%s\n", x);
      }
   }

   public static void println(boolean x){
      if(write == true){
   		saida.format( "%s\n", ((x) ? "true" : "false"));
      }
   }

   public static void println(char x){
      if(write == true){
		   saida.format( "%c\n", x);
      }
   }

   public static int readInt(){
      int resp = -1;
		try{
         resp = entrada.nextInt();
		}  catch (Exception e) {}
      return resp;
   }

   public static char readChar(){
      char resp = ' ';
		try{
         resp = (char)entrada.nextByte();
		}  catch (Exception e) {}
      return resp;
   }

   public static double readDouble(){
      double resp = -1;
		try{
         resp = entrada.nextDouble();
		}  catch (Exception e) {}
      return resp;
   }

   public static String readString(){
      String resp = "";
		try{
         resp = entrada.next();
		}  catch (Exception e) { System.out.println(e.getMessage()); }
      return resp;
	}

   public static boolean readBoolean(){
      boolean resp = false;
		try{
         resp = (entrada.next().equals("true")) ? true : false;
		}  catch (Exception e) {}
      return resp;
	}

   public static String readLine(){
      String resp = "";
		try{
         resp = entrada.nextLine();
		}  catch (Exception e) { System.out.println(e.getMessage()); }
      return resp;
	}


   public static boolean hasNext(){
      return entrada.hasNext();
   }

   public static String readAll(){
      String resp = "";
      while(hasNext()){
         resp += (readLine() + "\n");
      }
      return resp;
   }
}