Ggtcf

I generate a truth table from any boolean expression and store it into a 2D array. As a first step, I store my boolean expression in an object arrayList. I count noumbers of variables to deduct numbers of columns(variables) and numbers of rows(combinaisons).

 nbrVariables = variables.size();
 nbrCombinaisons = (int)Math.pow(2,variables.size()); 
 truth_table = new int [nbrCombinaisons][nbrVariables+1]; 

I declare nbrVariables+1 because I need 1 column which represents my output. Using a loop, I generate each combinaisons of my truth table.

I have this in my console :

---- Equation : [soccer, +, food]
---- Variables : [soccer, food]

variables : 2
combinaisons : 4

header : [food, soccer]

[0, 0, null]
[0, 1, null]
[1, 0, null]
[1, 1, null]

As you can see, each elements of my last columns is null. To complete this column which represents my output, I need to evaluate my boolean expression for each of this combinaisons. I reiterate that my boolean expression is a arrayList of Objects.

To complete it, I use a string buffer to use a script that evaluate my boolean expression for each combinaisons(=each row).

public void getOutput() throws ScriptException

 StringBuffer sbExpr = new StringBuffer();
 temp= new ArrayList<Object>();
 temp.addAll(equation);

 for(int i=0; i<=nbrCombinaisons-1; i++)
 for (int j=0; j<=nbrVariables-1 ; j++)
 if(equation.contains(variables.get(j).getName()))
 temp.set(equation.indexOf(variables.get(j).getName()), truth_table[i][j]);

 
 
 truth_table[i][nbrVariables]= getResult(temp, sbExpr );

 
 

public int getResult(ArrayList<Object> temp, StringBuffer sbExpr) throws ScriptException

 sbExpr.delete(0, sbExpr.length()); 
 for(int i =0; i< temp.size(); i++)
 if(temp.get(i).equals(1))
 sbExpr.append("1");
 else if(temp.get(i).equals(0))
 sbExpr.append("0");
 else if(temp.get(i).getClass().equals(String.class))
 switch((String)temp.get(i))
 ");
 break; 
 case ".": 
 sbExpr.append("&");
 break; 
 case "¤": 
 sbExpr.append("^");
 break; 
 case "!": 
 sbExpr.append("!");
 break; 
 case "(": 
 sbExpr.append("(");
 break; 
 case ")": 
 sbExpr.append(")");
 break; 
 default: 
 System.out.println("no match"); 
 
 
// System.out.println("nsbExpr -----> " +sbExpr ); 

 ScriptEngineManager sem = new ScriptEngineManager();
 ScriptEngine se = sem.getEngineByName("JavaScript");
 if (se.eval(sbExpr.toString()).toString().equals("1"))
 return 1;
 else
 return 0;
 
 

Well this works fine.

[PCU, Fuel circuit]

[0, 0, 0]
[0, 1, 1]
[1, 0, 1]
[1, 1, 1]

But I would like to know if there is an other way to do it because this way is, for me, not very sexy. It is heavy and more I have variables, more it is long. Also, I am asking me if using script can be use in other computer if I want share my application.

Thank you for yout help