I have an String arraylist with the following content:

[0] = "ID: 12"
[1] = "Term: Banana"
[2] = "Definition = yellow fruit"
[3] = "ID: 14"
[4] = "Term: Apple"
[5] = "Definition = green fruit"
[6] = "Description = Beautiful fruit"
[7] = "ID: 16"
[8] = "Term: Melon"
[9] = "Definition = yellow fruit"

I only need the output from ID to the next ID.

For example:

Term: Apple
Definition = green fruit
Description = Beautiful fruit

How can I access it without specifying the exact location. I thought of contains("ID") until the next contains("ID"), I just don't know how to implement it.

Thank you very much for your help

CodePudding user response：

i thing you should use collection objects in the array instead of string as it is.it allows you to collect your desired data in the order you want.

CodePudding user response：

If you do not need to print IDs, you can just filter them out by using String::startsWith:

List<String> data = Arrays.asList(
    "ID: 12", "Term: Banana", "Definition = yellow fruit",
    "ID: 14", "Term: Apple", "Definition = green fruit", "Description = Beautiful fruit",
    "ID: 16", "Term: Melon", "Definition = yellow fruit"
);

for (String item : data) {
    if (item != null && !item.startsWith("ID:")) {
        System.out.println(item);
    } else { // optionally print empty line to separate items
        System.out.println();
    }
}

CodePudding user response：

is this your mean?

public static void main(String[] args){
        List<String> strList = new ArrayList<>();

        strList.add("ID: 12");
        strList.add("Term: Banana");
        strList.add("Definition = yellow fruit");
        strList.add("ID: 14");
        strList.add("Term: Apple");
        strList.add("Definition = green fruit");
        strList.add("Description = Beautiful fruit");
        strList.add("ID: 16");
        strList.add("Term: Melon");
        strList.add("Definition = yellow fruit");

        StringBuilder sb = null;
        for (String str: strList){
            if(str.startsWith("ID: ")){
                if (null != sb){
                    String term = sb.toString();
                    System.out.println(term);
                }
                sb = new StringBuilder();
                continue;
            }
            sb.append(str   "\n");
        }

        if (null != sb){
            String term = sb.toString();
            System.out.println(term);
        }
    }