[Java]Declaring Multidimensional Array within loop

Question

String[][] aS= new String[16][3];

String[] s0 ={"FIELD0", "FIELD1", "FIELD2"};
String[] s1 ={"FIELD0", "FIELD1", "FIELD2"};
String[] s2 ={"FIELD0", "FIELD1", "FIELD2"}; ...
String[] s15 ={"FIELD0", "FIELD1", "FIELD2"};

for(int i=0;i<aS.length;i++)
{
    for(int j=0;j<3;j++)
    {
        //error!
        aS[i][j]= s+"i"+[j];   //s0[0],s0[1]...s15[3]
    }
}

Im familiar with multidimensional arrays, im just not abot to figure out how this part can be fixed: " s+"i"+[j]; "

Edit:[error] Syntax error on token "+", Expression expected after this token

Syntax error on token "+", Expression expected after this token — Zen
– Zen, Commented Feb 16, 2014 at 14:06

Maroun · Accepted Answer · 2014-02-16 14:05:36Z

1

You can't do that in Java (and in most programming languages), it doesn't support dynamic naming.

If you want to use s0, s1 or any other array, you should write it, for example:

aS[i][j]= s0[j];

answered Feb 16, 2014 at 14:05

Maroun

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1 Comment

Zen Over a year ago

yup, but then i'd have to keep chanding s0,s1,s2; manually. i'd labelled them numbers hoping i could change 0,1,2... within a loop

Aniket Thakur · Accepted Answer · 2014-02-16 14:06:37Z

1

First of all in Java you cannot create dynamic names of variables. So

aS[i][j]= s+"i"+[j];   //s0[0],s0[1]...s15[3]

is incorrect

String[][] aS= new String[16][3];

This means you can have 16 1D String arrays each of size 3 i.e 3 Strings in each array.

for(int i=0;i<aS.length;i++)
{
        aS[i]= yourArray  //s0[0],s0[1]...s15[3]
}

Here yourArray should be String[] with size 3 similar to your S0 - S15.

or you can do

for(int i=0;i<aS.length;i++)
{
    for(int j=0;j<3;j++)
    {
        aS[i][j]= "FIELD" + j;
    }
}

answered Feb 16, 2014 at 14:06

Aniket Thakur

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1 Comment

Zen Over a year ago

i tried doing this: aS[i][j]= "s"+i[j]; now the error is: "The type of the expression must be an array type but it resolved to int"

Ebbe M. Pedersen · Accepted Answer · 2014-02-16 14:16:00Z

1

If you want to initialize your multidimensional array you can do it like this:

String[][] aS = { {"FIELD0", "FIELD1", "FIELD2"},
                  {"FIELD0", "FIELD1", "FIELD2"}, 
                  {"FIELD0", "FIELD1", "FIELD2"},
                  ...
                  {"FIELD0", "FIELD1", "FIELD2"} };

answered Feb 16, 2014 at 14:16

Ebbe M. Pedersen

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1 Comment

Zen Over a year ago

yup,creating separate arrays just looked neat, i guess i'd go with this if looping isnt possible :)

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