Hi Friend,

Please try the following code:

import java.util.*;

public class Computer{
static String name;
static int size;
static int speed;
static String make;
static double price;
static int quantity;
public Computer(String n,int s,int sp,String m,double p,int q){
name=n;
size=s;
speed=sp;
make=m;
price=p;
quantity=q;
}
public String getName(){
return name;
}
public int getSize(){
return size;
}
public int getSpeed(){
return speed;
}
public String getMake(){
return make;
}
public double getPrice(){
return price;
}
public int getQuantity(){
return quantity;
}
public void valid(){
if((price==0)||(price<0)){
System.out.println("Please enter price");
System.exit(0);
}
else if((quantity==0)||(quantity<0)){
System.out.println("Please enter quantity ");
System.exit(0);
}
else{
displayData();
}
}
public void displayData(){
List<Computer> list = new ArrayList<Computer>();
list.add(new Computer(name,size,speed,make,price,quantity));
for (Computer s : list){
System.out.println("Computer Name: "+s.getName()+ "\nRAM Size :"+s.getSize()+"\nProcessor Make: "+s.getMake()+"\nProcessor Speed: "+s.getSpeed()+"\nQuantity: "+s.getQuantity()+"\nTotal Price of Computers: "+s.getPrice());
}
}
public static void main(String[]args){
System.out.println("Enter details");
Scanner input=new Scanner(System.in);
System.out.println("Computer Name: ");
name=input.next();
System.out.println("RAM Size: ");
size=input.nextInt();
System.out.println("Processor Speed: ");
speed=input.nextInt();
System.out.println("Processor Make: ");
make=input.next();
System.out.println("nQuantity: ");
quantity=input.nextInt();
System.out.println("Price: ");
price=input.nextDouble();
Computer c=new Computer(name,size,speed,make,price,quantity);
c.valid();
}
}

Thanks