Question

in java, i have an array of floats, some of them are negative numbers, like :

3.04, 9.02, -4.2, -3.21, 0.02, -0.34

I only want to get the float numbers higher than 2, so I used :

if(number > 2.0 ) print.. etc

but what i get is not only the numbers >2, also the negative numbers :

3.04, 9.02, -4.2, -3.21

what could be the problem ?

Answer 1

Based on comments and question, assuming we have a file named numbers.txt with content:

3.04 
9.02 
-4.2 
-3.21 
0.02 
-0.34

this code should do the trick (I ommited exception handling for readibility):

float[] floats = new float[100];  // adjust as needed

String fileName = "numbers.txt";
File f = new File(fileName);
BufferedReader br = new BufferedReader(new FileReader(f));

String line = "";

int i = 0;

while( (line = br.readLine()) != null) {

    if(line == null || line.isEmpty()) continue;  // just in case there are empty lines in file
    floats[i] = Float.parseFloat(line);
    i++;
}

br.close();

for (float number : floats) {
    if (number > 2.0) {
        System.out.println(number);
    }
}

Output:

3.04
9.02