private String brand;
private String processor;
private String ram;

public Computer(String brand, String processor, String ram) {

this.brand = brand;
this.processor = processor;
this.ram = ram;

}

public static class Builder {
private String brand;
private String processor;
private String ram;
private String storage;

public Builder() {
}

public Builder setBrand(String brand) {
this.brand = brand;
return this;
}

public Builder setProcessor(String processor) {
this.processor = processor;
return this;
}

public Builder setRam(String ram) {
this.ram = ram;
return this;
}

public Builder setStorage(String storage) {
this.storage = storage;
return this;
}

public Computer build() {
return new Computer(brand, processor, ram);
}
}

public static void main(String[] args) {

Computer computer = new Builder()
.setBrand("Mac")
.setProcessor("I3")
.build();

System.out.println(" Brand : " + computer.brand);
System.out.println(" Processor :: " + computer.processor);

}

}