private void leeSopa()
{
String unaLinea;
    try {
    int i=0;
    while((unaLinea = sopaStream.readLine())!=null){
    String t = unaLinea.replace(" ", "");
    columnas = t.length();
    	for(int j=0;j<columnas;j++)
        	sopa[i][j]=t.charAt(j);
        	i++;
    			}
    		}
        catch(IOException e){
        	e.printStackTrace();
        }
   }

java.io.BufferedReader bufferedReader = new java.io.BufferedReader(
				new java.io.InputStreamReader(System.in));
		System.out.print("Ingresa un texto: ");
		String text1=bufferedReader.readLine();
		//
	    java.util.Scanner scanner = new java.util.Scanner(System.in);
		System.out.print("Ingresa un texto: ");
		String text2=scanner.next();

     private String text = null;

public String getText() {return text;}
public void setText(String text) {this.text = text;}

clase miClase = new Clase();

miClase.setText(text);

clase miClase = new Clase(text1,text2);

public class(String t1,String t2){
 
}

String t = unaLinea.replace(" ", "");
columnas = t.length();

 sopa[0]=unaLinea.charAt(i);

int i=0;
    while((unaLinea = sopaStream.readLine())!=null){
    String t = unaLinea.replace(" ", "");
    columnas = t.length();
    	for(int j=0;j<columnas;j++)
        	sopa[i][j]=t.charAt(j);
        	i++;
      }

salidaObj.flush();
salidaObj.close();

InObj.readObject();

String cadena = new String("HOLA");
cadena[0] = cadena.charAt(cadena.length() - 1);

        StringBuffer string = new StringBuffer("Prueba");
        char b=string.charAt(string.length()-1);
        string.setCharAt(string.length()-1, string.charAt(0));
        string.setCharAt(0, b);