Подскажите как поправить метод toString

public class Computer {
    
        public  String vendor;
        public  String name;
        public  Processor processor;
        public  OperationMemory operationMemory;
        public  StorageMemory storageMemory;
        public  Screen screen;
        public  Keyboard keyboard;
        public  double totalWeight;
    
        public Computer () {
        }
    
        public Computer (String vendor, String name){
            this.vendor = vendor;
            this.name = name;
        }
    
        public Computer (String vendor, String name, double totalWeight) {
            this.vendor = vendor;
            this.name = name;
    
        }
        public Computer (String vendor,
                         String name,
                         Processor processor,
                         OperationMemory operationMemory,
                         StorageMemory storageMemory,
                         Screen screen,
                         Keyboard keyboard,
                         double totalWeight) {
            this.vendor = vendor;
            this.name = name;
            this.processor = processor;
            this.operationMemory = operationMemory;
            this.storageMemory = storageMemory;
            this.screen = screen;
            this.keyboard = keyboard;
            this.totalWeight = totalWeight;
        }
        public void setVendor (String vendor) {
            this.vendor = vendor;
        }
        public void setName (String name) {
            this.name = name;
        }
        public String getVendor() {return vendor;}
        public String getName() {return name;}
    
        public double getTotalWeight() {
            return processor.getWeight()+ operationMemory.getWeight()+ storageMemory.getWeight() +
                    screen.getWeight() + keyboard.getWeight();
        }
        public String toString() {
            return "Данные о компьютере:" + "\n" + "\n" +
                    "Страна производитель: " + getName() + "\n" +
                    "Поставщик: " + getVendor() + "\n" +
                    processor.toString() + operationMemory.toString() + storageMemory.toString() +
                    screen.toString() +keyboard.toString() + "Общий вес омпьютера: " +getTotalWeight() + "гр."  + "\n" ;
      public Processor getProcessor(){ return processor;}
public OperationMemory getOperationMemory(){ return operationMemory;}
public StorageMemory getStorageMemory(){ return storageMemory;}
public Screen getScreen(){ return screen;}
public Keyboard getKeyboard(){ return keyboard;}
 
public void setProcessor(Processor processor) { this.processor = processor;}
public void setOperationMemory(OperationMemory operationMemory) { this.operationMemory = operationMemory;}
public void setStorageMemory(StorageMemory storageMemory) { this.storageMemory=storageMemory;}
public void setScreen(Screen screen) {this.screen=screen;}
public void setKeyboard(Keyboard keyboard) {this.keyboard=keyboard;}
        }
    }
 
public class Main {
public static void main(String[] args) {
 
    Processor processor_1 = new Processor(3.5, 4, "Intel", 9.15);
    OperationMemory operationMemory_1 = new OperationMemory("DDR3", 8192, 18.0);
    StorageMemory storageMemory_1 = new StorageMemory("StorageMemoryType",  500);
    Screen screen_1 = new Screen( "24", 5);
    Keyboard keyboard_1 = new Keyboard("Механическая", true, 2500);
 
    Computer computer_1 = new Computer("Intel", "China");
    computer_1.setProcessor(processor_1);
    computer_1.setOperationMemory(operationMemory_1);
    computer_1.setStorageMemory(storageMemory_1);
    computer_1.setScreen(screen_1);
    computer_1.setKeyboard(keyboard_1);
 
    System.out.println(computer_1.toString());
 
}public class OperationMemory {
    
        public String typeOM;
        public int volume;
        public double weight;
    
        public OperationMemory (String typeOM, int volume, double weight) {
            this.typeOM = typeOM;
            this.volume = volume;
            this.weight = weight;
        }
    
        public OperationMemory setTypeOM (String typeOM) {
            return new OperationMemory(typeOM, volume, weight);
        }
        public OperationMemory setVolume (int volume) {
            return new OperationMemory(typeOM, volume, weight);
        }
        public OperationMemory setWeight (double weight) {
            return new OperationMemory(typeOM, volume, weight);
        }
        public String getTypeOM() {return typeOM;}
        public int getVolume() {return volume;}
        public double getWeight() {return weight;}
    }
    
    public class Processor {
        public double frequency;
        public int amountCore;
        public String brand;
        public double weight;
    
    
    Processor(double frequency, int amountCore, String brand, double weight) {
        this.frequency = frequency;
        this.amountCore = amountCore;
        this.brand = brand;
        this.weight = weight;
    }
 
    public double getFrequency() {return frequency;}
    public int getAmountCore() {return amountCore;}
    public String getBrand() {return brand;}
    public double getWeight() {return weight;}
 
    void setFrequency (double frequency){this.frequency = frequency;}
    public void setAmountCore(int amountCore) {this.amountCore=amountCore;}
    public void setBrand(String brand) {this.brand=brand;}
    public void setWeight(double weight) {this.weight = weight;}
}