public void nextQuestion(){
		Scanner input = new Scanner(System.in);
		 question=new Test();
			Random random = new Random();
		       number = random.nextInt(4);
		       while(check.contains(number))
		       {
		            number = random.nextInt(4);
		       }
		       check.add(number);
		
		          switch(number)
		          {
		           case 0:
		               
		              System.out.println(question.question1(questions)); 
		          break;
		            case 1:
		               
		            	 System.out.println(question.question2(questions));
		            	 break;
		            case 2:
		               
		            	 System.out.println(question.question3(questions));
		            	 break;
		            case 3:
		               
		            	 System.out.println(question.question4(questions));
		            	 break;
		            	
		        
		}
		
		
		
		String answer = input.nextLine();
		if(answer.equalsIgnoreCase("a"))
			userAnswer = 0;
		else if(answer.equalsIgnoreCase("b"))
			userAnswer = 1;
		else if(answer.equalsIgnoreCase("c"))
			userAnswer = 2;
		else if(answer.equalsIgnoreCase("d"))
			userAnswer = 3;
		
		checkTrue();
		
	}