Convertirn un char a string y esta string a mayusculas

[moji87]

/*
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* and open the template in the editor.
*/
package ccadenas;

/**
*
* @author moji87
*/
import java.io.*;
public class CCadenas {

/**
* @param args the command line arguments
*/
public static void main(String[] args)
{
char []cadena =new char[80];
int car ,i=0;

try{
System.out.println("Escriba una cadena de caracteres:");
while((car=System.in.read()) != '\n' && i<cadena.length
)
{
cadena[i++]=(char)car;

}

String scadena=(new StringBuffer().append(cadena)).toString();
System.out.println("Cadena en mayúsculas: " + scadena.toUpperCase());
}
catch(IOException e)
{

}
}
}

[feelDweb]

Para convertir de caracter a String:

public class CharToString{
public static void main(String args[])throws IOException{
BufferedReader read =
new BufferedReader(new InputStreamReader(System.in));
System.out.println("Enter a Character:");
String s = read.readLine();
char c = s.charAt(0);
System.out.println("Character value is " + c);
String s1 = Character.toString(c);
System.out.println("String value is " + s1);
}
}

Para pasar el String a mayúscula se usa el método de objeto "toUpperCase()".