ObjectUpdateExample.java

import java.util.ArrayList;
import java.util.List;
import java.util.stream.LongStream;


public class ObjectUpdateExample {
    public static <T> void printArray(List<T> list) {
        printArray(list.toArray());
    }
    
    public static <T> void printArray(T[] array) {
        if (array == null || array.length < 1) {
            System.out.println("[]");
            return;
        }
        
        T lastItem = array[array.length - 1];
        System.out.println("[");

        for (T item : array) {
            String tail = lastItem == item ? "" : ",";
            System.out.printf("  %s%s\n", item, tail);
        }

        System.out.println("]");
    }

    public static void main(String[] args) {
        TargetDTO dto = new TargetDTO();
        System.out.printf("Before update: %s\n", dto);

        updateObject(dto);

        System.out.printf("After update: %s\n", dto);
        
        List<SelectionDefinition> definitions = new ArrayList<>();
        LongStream.range(1, 10).forEach(val -> {
            SelectionDefinition definition = new SelectionDefinition();
            definition.id = val;
            definition.label = String.format("Definition[%d]", val);
            
            definitions.add(definition);
        });
        
        printArray(definitions);
    }

    static void updateObject(TargetDTO dto) {
        dto.selection = new SelectionDefinition();
        String label = dto.taxonomy.label;
        
        dto.taxonomy.label = label.trim();
    }
}

class TargetDTO {
    public Long id;
    public String location;

    public TaxonomyDTO taxonomy;

    public String status;
    
    public SelectionDefinition selection;

    public TargetDTO() {
        id = 10L;
        location = "home";
        taxonomy = new TaxonomyDTO();
        
        status = "created";
    }

    @Override
    public String toString() {
        return '{' +
                "id:" + id +
                ", location:'" + location + '\'' +
                ", taxonomy:'" + taxonomy + '\'' +
                ", status:'" + status + '\'' +
                ", selection:'" + selection + '\'' +
                '}';
    }
}

class TaxonomyDTO {
    public Long id;
    public String label;
    
    public TaxonomyDTO() {
        id = 8L;
        label = "station test 003";
    }

    @Override
    public String toString() {
        return '{' +
                "id:" + id +
                ", label:'" + label + '\'' +
                '}';
    }
}

class SelectionDefinition {
    public Long id;
    public String label;
    
    public SelectionDefinition() {
        id = 1L;
        label = "okay";
    }

    @Override
    public String toString() {
        return '{' +
                "id:" + id +
                ", label:'" + label + '\'' +
                '}';
    }
}