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Evaluate boolean expressions from arrayList


Create ArrayList from arrayHow do I call one constructor from another in Java?When to use LinkedList over ArrayList in Java?How do I create a Java string from the contents of a file?How to get an enum value from a string value in Java?Initialization of an ArrayList in one lineSort ArrayList of custom Objects by propertyCheck if at least two out of three booleans are trueConverting 'ArrayList<String> to 'String[]' in JavaConvert ArrayList<String> to String[] array













1















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










share|improve this question






















  • Why do you generate a script rather than evaluating the expression directly?

    – Alexandre Dupriez
    Mar 8 at 7:47











  • Because I do not know how to do it from an ArrayList... :/

    – Miigui_08
    Mar 8 at 8:12











  • Why not use an ArrayList<Boolean>?

    – Nicholas K
    Mar 8 at 8:38











  • Even if I use an ArrayList<Boolean> , I will need to parse my expression boolean which is into my ArrayList<Object> and identify which columns are which variables. Well, to be honset, at the beginning, my 2D array was typed HashMap<String, Boolean> . But I was due to create for each element, an HashMap. Too gourmet. So I prefer work with Integer and try to identify it. Furthermore, I want implements Quine Mc Cluskey method to minmise any boolean expression. To do that, I will use an 2D array with integer to work easly. But thats is an other issue ahaha. Thanks

    – Miigui_08
    Mar 8 at 8:46
















1















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










share|improve this question






















  • Why do you generate a script rather than evaluating the expression directly?

    – Alexandre Dupriez
    Mar 8 at 7:47











  • Because I do not know how to do it from an ArrayList... :/

    – Miigui_08
    Mar 8 at 8:12











  • Why not use an ArrayList<Boolean>?

    – Nicholas K
    Mar 8 at 8:38











  • Even if I use an ArrayList<Boolean> , I will need to parse my expression boolean which is into my ArrayList<Object> and identify which columns are which variables. Well, to be honset, at the beginning, my 2D array was typed HashMap<String, Boolean> . But I was due to create for each element, an HashMap. Too gourmet. So I prefer work with Integer and try to identify it. Furthermore, I want implements Quine Mc Cluskey method to minmise any boolean expression. To do that, I will use an 2D array with integer to work easly. But thats is an other issue ahaha. Thanks

    – Miigui_08
    Mar 8 at 8:46














1












1








1


1






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










share|improve this question














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







java optimization boolean-operations javascript-engine






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Mar 8 at 7:10









Miigui_08Miigui_08

154




154












  • Why do you generate a script rather than evaluating the expression directly?

    – Alexandre Dupriez
    Mar 8 at 7:47











  • Because I do not know how to do it from an ArrayList... :/

    – Miigui_08
    Mar 8 at 8:12











  • Why not use an ArrayList<Boolean>?

    – Nicholas K
    Mar 8 at 8:38











  • Even if I use an ArrayList<Boolean> , I will need to parse my expression boolean which is into my ArrayList<Object> and identify which columns are which variables. Well, to be honset, at the beginning, my 2D array was typed HashMap<String, Boolean> . But I was due to create for each element, an HashMap. Too gourmet. So I prefer work with Integer and try to identify it. Furthermore, I want implements Quine Mc Cluskey method to minmise any boolean expression. To do that, I will use an 2D array with integer to work easly. But thats is an other issue ahaha. Thanks

    – Miigui_08
    Mar 8 at 8:46


















  • Why do you generate a script rather than evaluating the expression directly?

    – Alexandre Dupriez
    Mar 8 at 7:47











  • Because I do not know how to do it from an ArrayList... :/

    – Miigui_08
    Mar 8 at 8:12











  • Why not use an ArrayList<Boolean>?

    – Nicholas K
    Mar 8 at 8:38











  • Even if I use an ArrayList<Boolean> , I will need to parse my expression boolean which is into my ArrayList<Object> and identify which columns are which variables. Well, to be honset, at the beginning, my 2D array was typed HashMap<String, Boolean> . But I was due to create for each element, an HashMap. Too gourmet. So I prefer work with Integer and try to identify it. Furthermore, I want implements Quine Mc Cluskey method to minmise any boolean expression. To do that, I will use an 2D array with integer to work easly. But thats is an other issue ahaha. Thanks

    – Miigui_08
    Mar 8 at 8:46

















Why do you generate a script rather than evaluating the expression directly?

– Alexandre Dupriez
Mar 8 at 7:47





Why do you generate a script rather than evaluating the expression directly?

– Alexandre Dupriez
Mar 8 at 7:47













Because I do not know how to do it from an ArrayList... :/

– Miigui_08
Mar 8 at 8:12





Because I do not know how to do it from an ArrayList... :/

– Miigui_08
Mar 8 at 8:12













Why not use an ArrayList<Boolean>?

– Nicholas K
Mar 8 at 8:38





Why not use an ArrayList<Boolean>?

– Nicholas K
Mar 8 at 8:38













Even if I use an ArrayList<Boolean> , I will need to parse my expression boolean which is into my ArrayList<Object> and identify which columns are which variables. Well, to be honset, at the beginning, my 2D array was typed HashMap<String, Boolean> . But I was due to create for each element, an HashMap. Too gourmet. So I prefer work with Integer and try to identify it. Furthermore, I want implements Quine Mc Cluskey method to minmise any boolean expression. To do that, I will use an 2D array with integer to work easly. But thats is an other issue ahaha. Thanks

– Miigui_08
Mar 8 at 8:46






Even if I use an ArrayList<Boolean> , I will need to parse my expression boolean which is into my ArrayList<Object> and identify which columns are which variables. Well, to be honset, at the beginning, my 2D array was typed HashMap<String, Boolean> . But I was due to create for each element, an HashMap. Too gourmet. So I prefer work with Integer and try to identify it. Furthermore, I want implements Quine Mc Cluskey method to minmise any boolean expression. To do that, I will use an 2D array with integer to work easly. But thats is an other issue ahaha. Thanks

– Miigui_08
Mar 8 at 8:46













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