Comparing String Array

Question

Good Eve guys, this is a school activity, and i find difficulty in comparing my INPUTTED ARRAY if it is equal to 0(ZERO), greater than 0(ZERO), and lesser than 0(ZERO).

heres my code...

String display="";

    String size = JOptionPane.showInputDialog("Enter Your Prefered Size Of Your Array");
    int newsize = Integer.parseInt(size);

    JOptionPane.showMessageDialog(null,"You Entered "+newsize+".");

    String array[] = new String[newsize];

    for (int a=0; a<array.length;a++)
    {
        array[a]=JOptionPane.showInputDialog("Enter Value For Array["+a+"].");

    }


    //i'm having trouble here.........

    for (int a=0;a<array.length;a++)
    {
        if (array[a].equals(array[0]))
        {

        }
        else if (array[a] < (array[0]))
        {

        }



        display=display+array[a]+"\n";
    }
    JOptionPane.showMessageDialog(null,"Arrays\n"+display);

please someone help me......

EDITTED:

and at the lastpart i want it to display that the ARRAY is "ZERO", "POSITIVE", "NEGATIVE" (i really dont know how to do it).

Masudul · Accepted Answer · 2013-11-12 11:58:43Z

4

You can't use conditional operator < in String comparison. Use compareTo method.

 array[a].compareTo(array[0])> 0 // greater    
 array[a].compareTo(array[0])< 0 // less
 array[a].compareTo(array[0])== 0 // equals

Update

Update your code with following segments.

for (int a=0;a<array.length;a++)
{
    if (array[a].compareTo(array[0])== 0)
    {
      //this is equals block
    }
    else if (array[a].compareTo(array[0])< 0)
    {
     //this is less than block.
    }
    display=display+array[a]+"\n";
 }

edited Nov 12, 2013 at 11:58

answered Nov 12, 2013 at 11:53

Masudul

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5 Comments

jarnthrax Over a year ago

how do i do that sir?

jarnthrax Over a year ago

i get it, but sir, how do i display that my ARRAY is greater, equal or lesser. like ARRAY[0] contains 0 then i will display: 0 ZERO. and ARRAY[1] contains 1 then display: 1 POSITIVE

Masudul Over a year ago

To check contains 0, than you need to use String.contains("0") method. Above is sample example of String comparison.

jarnthrax Over a year ago

thank you for your help. i get it, but sir, how do i display that my ARRAY is greater, equal or lesser. like ARRAY[0] contains 0 then i will display: 0 ZERO. and ARRAY[1] contains 1 then display: 1 POSITIVE ARRAY[2] contains -1 then display -1 NEGATIVE

Masudul Over a year ago

@user2981000, That is different scenario. Pleas, post another question with what you exaclty want.

NPE · Accepted Answer · 2013-11-12 11:51:11Z

0

If you need to compare to the number zero, change array[0] to just 0.

answered Nov 12, 2013 at 11:51

NPE

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