how to compare two string that read from csv file and saved in string array

Question

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How do I compare strings in Java?

I read some records from a csv file and store them into a string type array, then save each field in proper variable after convert them. In a part of code I have to compare a field in array with one of those variables with string type. both these arrays filled from a csv file.

            int count=0;
            String name=resourceArray[i][j+1] ;
            while(machineArray[count][0]==name)
            {

                machineID=Integer.parseInt(machineArray[count][1]);
                machinePe=Integer.parseInt(machineArray[count][2]);
                count++;
             }

the problem is 'while' condition never become true. I debug it and I'm sure machineArray[0][0] and 'name' have same value.

score 0 · Answer 1 · answered Oct 04 '12 at 13:13

0

Try changing your condition from machineArray[count][0]==name to machineArray[count][0].equals(name).

answered Oct 04 '12 at 13:13

Russell Gutierrez

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score 0 · Answer 2 · answered Oct 04 '12 at 13:15

0

Essentially you are comparing pointers to two String objects by using == instead of comparing Strings.

To compare Strings you have to use Strings equals method:

machineArray[count][0].equals(name)

answered Oct 04 '12 at 13:15

dngfng

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score -1 · Accepted Answer · answered Oct 04 '12 at 13:13

-1

Strings do not always have the same identity (although it is common). Try:

machineArray[count][0].equals(name)

answered Oct 04 '12 at 13:13

David Grant

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how to compare two string that read from csv file and saved in string array

3 Answers3