Programming Interview Questions

Faisal

Consultant at Software AG

I love algorithms

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Comment hidden because of low score. Click to expand.

of 1 vote

public class One {
	static String name = "oneTwo";
	static int t = 1, limit = 6;
	static volatile boolean flag = true;

	static class MyThread extends Thread {
		Semaphore sem;
		String threadName;

		public MyThread(Semaphore sem, String threadName) {
			this.sem = sem;
			this.threadName = threadName;
		}

		public void run() {
			try {
				while (flag) {
					sem.acquire();
					if (t == 7)
						break;
					if (threadName.equalsIgnoreCase("one")
							&& threadName.equals(name.substring(0, 3))) {
						System.out.print(0);
						name = name.substring(3);

					} else if (threadName.equalsIgnoreCase("two")
							&& name.equalsIgnoreCase("two")) {
						System.out.print(t);
						t++;
						name = "oneThree";
					} else if (threadName.equalsIgnoreCase("three")
							&& name.equalsIgnoreCase("three")) {
						System.out.print(t);
						t++;
						name = "oneTwo";
					}
					sem.release();
				}
			} catch (InterruptedException e) {
				e.printStackTrace();
			}

		}

	}
	public static void main(String[] args) {
		Semaphore sem = new Semaphore(1);
		MyThread one = new MyThread(sem, "one");
		MyThread two = new MyThread(sem, "two");
		MyThread three = new MyThread(sem, "three");
		one.start();
		two.start();
		three.start();
	}}

- Faisal September 11, 2017 | Flag Reply

Comment hidden because of low score. Click to expand.

of 0 vote

class LRUCache {
	 static int size=0,capacity=0;
	 LinkedHashMap<Integer, Integer> cacheStore;
    /*Inititalize an LRU cache with size N */
    public LRUCache(int N) {
       size=0;
       capacity=N;
       cacheStore= new LinkedHashMap<Integer, Integer>(N);
    }
    
    /*Returns the value of the key x if 
     present else returns -1 */
    public synchronized int get(int x) {
       if(cacheStore.get(x)!=null){
    	   int num=cacheStore.get(x);
    	   cacheStore.remove(x);
    	   cacheStore.put(x, num);
    	   return num;
       }
    	return -1;
    }
    
    /*Sets the key x with value y in the LRU cache */
    public synchronized void set(int x, int y) {
    	int value=get(x);
    	if(value!=-1){
    		cacheStore.remove(x);
    		cacheStore.put(x, y);
    		return;
    		
    	}
    	if(size<capacity){
    		cacheStore.put(x, y);
    	     size++;
    	} 
    	else{
    		Iterator<Integer> itr=cacheStore.keySet().iterator();
    		cacheStore.remove(itr.next());
    		cacheStore.put(x, y);
    	}
      
    }
}

- Faisal August 11, 2017 | Flag Reply

Comment hidden because of low score. Click to expand.

of 0 vote

public class ShoppingSuggestor {;
public static Map<String,LinkedList<String>> shoppersMap=new HashMap<>();
public static Map<String,LinkedList<String>> itemStrongMap=new HashMap<>();
public static LinkedList<String> weakItemList= new LinkedList<String>();
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		ShoppingSuggestor shop=new ShoppingSuggestor();
		shop.addItem("first", "ABC");
		shop.addItem("first", "HIJ");
		shop.addItem("sec","HIJ");
		shop.addItem("sec", "KLM");
		shop.addItem("third", "NOP");
		shop.addItem("fourth", "ABC");
		shop.addItem("fourth", "QRS");
		shop.addItem("first", "DEF");
		shop.addItem("fifth", "KLM");
		shop.addItem("fifth", "TUV");
		System.out.println("Entries are successfull");
		Scanner sc=new Scanner(System.in);
		System.out.println("Enter itemName name");
		String desiredItem=sc.next();
		for(Map.Entry<String,LinkedList<String>> itemLList:shoppersMap.entrySet())
			shop.createMapFromList(itemLList.getValue());
		for(String item:itemStrongMap.get(desiredItem)){
			if(itemStrongMap.containsKey(item))
				shop.createWeakList(itemStrongMap.get(item),desiredItem);
		}
			System.out.println("["+itemStrongMap.get(desiredItem).size()+","+weakItemList.size()+"]");
		}
	private void createWeakList(LinkedList<String> list,String desiredItem){
		for(String item:list)
			if(!(weakItemList.contains(item)|| item.equalsIgnoreCase(desiredItem) || itemStrongMap.get(desiredItem).contains(item)))
				{weakItemList.add(item);
				createWeakList(itemStrongMap.get(item), desiredItem);
				}
}
	private void createMapFromList(LinkedList<String> list){
		for(String item1:list)
			for(String item2:list )
				if(!item1.equalsIgnoreCase(item2))
			       createItemMap(item1,item2);		
	}
	private  void createItemMap(String itemName, String attachedItem){
		if(itemStrongMap.containsKey(itemName)){
			LinkedList<String> addedItems=itemStrongMap.get(itemName);
			if(!addedItems.contains(attachedItem))
			addedItems.add(attachedItem);
			itemStrongMap.put(itemName, addedItems);
		}else
			itemStrongMap.put(itemName,new LinkedList<String>(Arrays.asList(attachedItem)));		
	}
private void addItem(String customerName, String item){
	if(shoppersMap.containsKey(customerName)){
		LinkedList<String> addedItems=shoppersMap.get(customerName);
		addedItems.add(item);
		shoppersMap.put(customerName, addedItems);
	}else	
		shoppersMap.put(customerName,new LinkedList<String>(Arrays.asList(item)));		
}

}

- Faisal May 06, 2017 | Flag Reply

Comment hidden because of low score. Click to expand.

of 0 vote

public class Employee {
      public static Map<String,String> buildingParkers=new HashMap<>();
	public static void main(String[] args) {
		addDetails("adrian",new EmployeeDetails("building1","building2"));
		addDetails("john",new EmployeeDetails("building2","building1"));
		addDetails("andrew",new EmployeeDetails("building3","building2"));
		addDetails("william",new EmployeeDetails("building4","building3"));
		addDetails("John",new EmployeeDetails("building2","building4"));
		addDetails("Doe",new EmployeeDetails("",""));
		System.out.println("Details successfully added ");
		for(Map.Entry<String,String> entry: buildingParkers.entrySet()){
			if(entry.getValue().contains(",") && !entry.getKey().equalsIgnoreCase("00"))
				System.out.println(entry.getValue());
		}

	}
	public static void addDetails(String alias, EmployeeDetails emp){
		String code=emp.getBuildingCode();
		String names="";
		if(buildingParkers.containsKey(code))
		{
			names=buildingParkers.get(code)+","+alias;
			buildingParkers.put(code, names);
		}
		else
		 buildingParkers.put(code,alias);
	}

}
class EmployeeDetails{
	private String fromBuilding;
	private  String toBuilding;
	public EmployeeDetails(String fromBuilding, String toBuilding) {
		this.fromBuilding=fromBuilding;
		this.toBuilding=toBuilding;
	}
	public String getBuildingCode(){
		String buildingCode="00";
		if(Integer.parseInt(getBuildingNumber(fromBuilding)) > Integer.parseInt(getBuildingNumber(toBuilding)))
			buildingCode=toBuilding+fromBuilding;
		else
			buildingCode=fromBuilding+toBuilding;
					return buildingCode;
		
	}
	private String getBuildingNumber(String building){
		if(building.isEmpty())
			return "0";
		else
			return building.substring(8,building.length());
	}

}

- Faisal May 06, 2017 | Flag Reply

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