BufferedReader reader = new BufferedReader (new.InputStreamReader (System.in));

[quote=Daniel.weissveja na linha comentada
import java.io.BufferedReader;
import java.io.BufferedInputStream;

public class Salario {

	  static void main(String[] args) {
		
		BufferedReader reader = new BufferedReader (new.InputStreamReader(System.in));

		//BufferedReader reader = new BufferedReader (new InputStreamReader(System.in)); seria isso :)

try {
		 
		 System.out.println("valor salário");
		String sal = reader.readLine();
		double Salário = new Double (sal).doubleValue();
		
		System.out.println ("deseja vale trans");
		String op1 = reader.readLine();
		double valtrans = new Double (op1).doubleValue();
		
		System.out.println ("deseja plano saude");
		 String op2 = reader.readLine();
		 double plsaude = new Double (op2).doubleValue();
		 
		  System.out.println("salario liquido:" );
		  
		salario = salario*0.89;
		  
		  if (salario > 1342)
			  salario = salario * 0.85;
		  
		  if (vltrans == 1 )
			  salario = salario * 0.92;
		  
		  if (plsaude == 1)
			  salario = salario - 50;
		  
		 
	  }catch (exceptiom e) {
		  System.out.println("valor inválido" );
		 
		  }

      }
}[/quote]

//Cria um scanner
Scanner in = new Scanner(System.in);

//Lê uma linha do teclado.
String texto = in.nextLine();

double valor = Double.parseDouble(texto);