tomcat - Java Web: Currency Converter -


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i'm working on project due 1 of classes. in it, need create currency converter converts 1 currency using array of conversion rates. however, can't program conversion rate array. 

       private static final double[][] rates =       { {1.0, 0.624514066, 0.588714763, 0.810307 },        {1.601244959, 1.0, 0.942676548, 1.2975},        {1.698615463, 1.060809248, 1.0, 1.3764},        {1.234100162, 0.772200772, 0.726532984, 1.0} };         public double getfxrate(final string incurr, final string outcurr){         int currency1;        int currency2;        double rate;         if(incurr == "cad"){            currency1 = 0;        }        if(incurr == "eur"){            currency1 = 1;        }        if(incurr == "gbp"){            currency1 = 2;        }        if(incurr == "usd"){            currency1 = 3;        }        if(outcurr == "cad"){            currency2 = 0;        }        if(outcurr == "eur"){            currency2 = 1;        }        if(outcurr == "gbp"){            currency2 = 2;        }        if(outcurr == "usd"){            currency2 = 3;        }           rate = rates[currency1][currency2];          return rate;         }    }

you can see array , method of getting number array. i'm getting error currency1 , currency2 might not have been initialized though if statements initialize them. can see i'm doing wrong?

also, i'm sure there's better way set values of currency1 , 2 8 different if statements want program work before worry efficiency. if want me i'd appreciate it's not priority.

thank you!

change these lines

int currency1; int currency2;

to

int currency1 = 0; int currency2 = 0;

change comparisons like

outcurr == "usd"

to more like

"usd".equals(outcurr)

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