java get elements inside array but know arrayname in string

Question

String[] strsub0={"out","err","in","console()"};
String[] strsub1={"print","println","append","close","flush"};

i want to get array elements and i know the name of the array.but i know aray name in String

int i=0; //this i get through a loop ,so i can't code strsub0 in my code.

String arrayname="strsub"+i;  //this is array name i want ,but it is a String.

//so i want get all elements inside array which name is strsub+i ; //arrayname.length not return strsub0.length but i want it.

for(int z=0;z<arrayname.length;z++){  

   System.out.println(arrayname[z]);

}

What is high level requirement? Something like what you are asking is rarely ever needed — geoand
– geoand, Commented May 3, 2014 at 12:42
Try making it into array of arrays like: String[][] a = {substr0, substr1,...}; for (int i = 0; i < a.length; ++i) { /* your code */ } — Bartosz Przybylski
– Bartosz Przybylski, Commented May 3, 2014 at 12:42
It's the XY problem. You probably want to rethink your approach. — keyser
– keyser, Commented May 3, 2014 at 12:46

Peter Lawrey · Accepted Answer · 2014-05-03 12:43:56Z

2

You want an array of arrays.

String[][] strsub={{"out","err","in","console()"},
                   {"print","println","append","close","flush"};

Then you can get

String[] arr = strsub[i];

answered May 3, 2014 at 12:43

Peter Lawrey

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1 Comment

ialexander Over a year ago

This was the only viable solution I could think of as well - that made any sense at least.

geoand · Accepted Answer · 2014-05-03 12:46:04Z

0

You could use a Map whose key is what you want and whose value is the array. Like the following:

Map<String, String[]> map = new HashMap<>(); //(assuming you have Java 7+ for the <> operator)
map.put("strsub0 ", new String[]{"out", "err", "in", "console()"});
map.put("strsub1 ", new String[]{"print", "println", "append", "close", "flush"});

Then retrieve the values like: map.get(arrayname)[i]. Of course you would have to check whether map.get(arrayname) actually exists or is null

answered May 3, 2014 at 12:46

geoand

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