Saving List<T> as String-CodePudding

I've been trying to save a list of data as Strings, but when I try a method .toString on List, it returns address in memory instead of data.

public class Item {

    Integer price = 20;
    Integer modelNumber = 100;
    String description = "Description";
    String title = "Title";
    Boolean wasBought = true;
}
public static void main(String[] args) {
    List<Item> data = new ArrayList<>();
    data.add(new Item());
    System.out.println(data.toString());
}

CodePudding user response：

You need to override toString function in your Item class. Add the following snippet into your Item class:

@Override
public String toString() {
    return "Item{"  
            "price="   price  
            ", modelNumber="   modelNumber  
            ", description='"   description   '\''  
            ", title='"   title   '\''  
            ", wasBought="   wasBought  
            '}';
}

Output:

[Item{price=20, modelNumber=100, description='Description', title='Title', wasBought=true}]

CodePudding user response：

You can convert List to json format string by json utils, e.g. jackson or fastjson, in case you may need to convert it to Objects later.

CodePudding user response：

Simply use Lombok (Add Lombok jar into classpath) @ToString annotate for Item class, it will do the needful output https://projectlombok.org/features/ToString