how to create a java function that makes random math problems. -

i trying create java function creates random math problems. want have function create problem onclick show answer.

is necessary use random int ?

i thinking making i random number using in math problems... appreciated.

private int rando(int i) {     random randomgenerator = new random();     int randomint = randomgenerator.nextint();     = randomint;     return rando(); }  public static int add(int i, int i) {     int = i+i;     return a; }  b1.addactionlistener(new actionlistener() {     public void actionperformed(actionevent e){         string b = "click answer";         b1.settext(b.tostring());          jl.settext(prob.tostring());     } }); 

how about

//or whatever numbers want here int mylow = -10; int myhigh = 10;   public int randbetween(int low, int high){     return (int) math.round(math.random() * (high - low)) + low; }  public string makeproblem(atomiclong answer){     int = randbetween(mylow, myhigh);     int b = randbetween(mylow, myhigh);     double result;     char operator;     switch(randbetween(1,4)){         case 1:              operator = '+';             result = + b;             break;         case 2:              operator = '-';             result = - b;             break;         case 3:              operator = '*';             result = * b;             break;         case 4:              operator = '/';             result = (double) / b;             break;         default:             operator = '\0';             result = double.nan;     }     answer.set(double.doubletolongbits(result));     return string.format("%d %c %d = ?",a,operator,b); }   public void yourfunction(){      //whatever need before      atomiclong outvariable = new atomiclong();     string question = makeproblem(outvariable);     double answer = double.longbitstodouble(outvariable.get());      //whatever need after  }