从具有两个不同大小/长度的两个arraylist获取相同值的索引

Question

I am new to Java and I want to get the index of same value of two arraylist however the two arraylist do NOT have the same size/length. This is the working code:

List<String> new_valueString = new ArrayList<>();
    List<String> new_fieldsString = new ArrayList<>();
    List<String> oldValueString = new ArrayList<>();
    List<String> oldFieldsString = new ArrayList<>();

  if (new_fieldsString.size() != 0 && new_valueString.size() != 0) {
        for (int l = 0; l < new_fieldsString.size(); l++) {
                if (new_fieldsString.get(l).equalsIgnoreCase(oldFieldsString.get(l))) {
                    field_index = l;
                    if (!new_valueString.get(field_index).contains(oldValueString.get(field_index))) {
                        ifUpdated = true;
                    } else {
                        ifUpdated = false;
                    }
                }
            }

    }

I want to get the index of the same value between new_fieldsString and oldFieldsString and use that index to compare the new_valueString and oldValueString.

Answer 1

Hello You need a two for sentences one for your first array and second to compare with the short arraylist and when you find your condition true not forget break the loop, some like this:

List<String> new_valueString = new ArrayList<>();
    List<String> new_fieldsString = new ArrayList<>();
    List<String> oldValueString = new ArrayList<>();
    List<String> oldFieldsString = new ArrayList<>();

  if (new_fieldsString.size() != 0 && new_valueString.size() != 0) {
        for (int l = 0; l < new_fieldsString.size(); l++) {
           for (int m = 0; m < oldFieldsString.size(); m++) {
                if (new_fieldsString.get(l).equalsIgnoreCase(oldFieldsString.get(m))) {
                    if (!new_valueString.get(l).contains(oldValueString.get(m))) {
                        ifUpdated = true;
                    } else {
                        ifUpdated = false;
                    }
                    break;
                }
            }
        }
    }