how to access previous index with array list?

Question

I Have Code like below

List<Transaction> ts = transaksiRepo.findAll();
 for (Transaction data5 : ts) {
        if (data5.getStatus().equals("NOT PAID OFF")) {
            log.info("Testing");
        }
 }

I want to get previous data index to condition if else on code in array list

Like this

List<Transaction> ts = transaksiRepo.findAll();
 for (Transaction data5 : ts) {
        if (data5.getStatus().equals("NOT PAID OFF") && previous index.getStatus.equals("NOT PAID OFF")) {
            log.info("Testing getStatementDate");
        }
 }

How do I resolve this?

SRJ · Accepted Answer · 2021-02-19 12:19:29Z

3

You can use simple for loop and achieve this easily.

I have started index starting from 1 as we will be comparing previous index i.e. 0th element.

Modify the logic as per your needs.

List<Transaction> ts = transaksiRepo.findAll();
for (int i=1;i<ts.size();i++) {
    if (ts.get(i).getStatus().equals("NOT PAID OFF") && ts.get(i-1).getStatus.equals("NOT PAID OFF")) {
        log.info("Testing getStatementDate");
    }
}

edited Feb 19, 2021 at 12:19

answered Feb 19, 2021 at 4:47

SRJ

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Comments

k314159 · Accepted Answer · 2021-02-19 10:13:05Z

1

I would recommend that you use ShubhWIP's answer, but if you absolutely prefer the enhanced for loop, you can still use it:

List<Transaction> ts = transaksiRepo.findAll();
Transaction prevTs = null;
for (Transaction data5 : ts) {
    if (data5.getStatus().equals("NOT PAID OFF") && prevTs != null && prevTs.getStatus.equals("NOT PAID OFF")) {
        log.info("Testing getStatementDate");
    }
    prevTs = ts;
}

answered Feb 19, 2021 at 10:13

k314159

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