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Q1. Write a program to traverse (or iterate) ArrayList? (Solution)

As I already mentioned,you can traverse ArrayList using for loop, while loop, advance for loop and iterator. This question tests knowledge of add() method of ArrayList and looping concept. Below example traverses ArrayList using advance for loop:

import java.util.*;
public class ArrayListLoopExample {
public static void main(String args[]) {
// initialize ArrayList
ArrayList<Integer> al = new ArrayList<Integer>();
// add elements to ArrayList object
al.add(3);
al.add(17);
al.add(6);
al.add(9);
al.add(7);
System.out.println("Using Advanced For Loop");
// printing ArrayList
for (Integer num : al) {
System.out.println(num);
}
}
}

Q2 Write a program to convert List to Array. (Solution)

List for e.g ArrayList or LinkedList can be converted to Array using toArray() method.

Q3 Write a program to traverse(or iterate) HashSet? (Solution)

You can traverse the HashSet using iterator or without using iterator as well.

Q4 Given an element write a program to check if element(value) exists in ArrayList?

You can check if element(value) exists in ArrayList using ArrayList contains() method. Example is given below :

import java.util.*;
public class ArrayListContainsExample {
public static void main(String args[]) {
// initialize ArrayList
ArrayList<Integer> al = new ArrayList<Integer>();
// add elements to ArrayList object
al.add(3);
al.add(17);
al.add(6);
al.add(9);
al.add(7);
// check if ArrayList contains element
if (al.contains(7)) {
System.out.println("7 was found in the list");
} else {
System.out.println("7 was not found in the list");
}
}
}


Q5 Given an element write a program to check if element exists in HashSet?

You can check if element(value) exists in HashSet using the contains() method. Example is given below :

import java.util.*;
public class HashSetContainsExample {
public static void main(String args[]) {
// initialize HashSet
HashSet<Integer> hs = new HashSet<Integer>();
// add elements to HashSet object
hs.add(3);
hs.add(17);
hs.add(6);
hs.add(9);
hs.add(7);
// check if HashSet contains element
if (hs.contains(7)) {
System.out.println("7 was found in the list");
} else {
System.out.println("7 was not found in the list");
}
}
}

Q6 Write a program to initialize a HashMap in java ?

You can initialize a HashMap in java using below code :

// initialize HashMap
HashMap<String,String> hashmap = new HashMap<String,String>();


Q7 Write a program to initialize an ArrayList in java?

// initialize ArrayList
ArrayList<Integer> al = new ArrayList<Integer>();


Q8 Write a program to convert Array to List? (Solution)

Array can be converted to list using Arrays.asList() method.

Q9 Write a program to find the length of the ArrayList? (Solution)

Length of the ArrayList can be found using size() method.

Q10 Write a program to add elements to the HashMap given the key and value data type is String?

// Declaring a HashMap of String keys and String values
HashMap<String, String> hashmap = new HashMap<String, String>();
// Adding key-value pairs to HashMap
hashmap.put("1", "Value1");
hashmap.put("2", "Value2");
hashmap.put("3", "Value3");
hashmap.put("4", "Value4");
hashmap.put("5", "Value5");


Q11 Write a program to initialize a HashSet in java?

// initialize HashSet
HashSet<Integer> al = new HashSet<Integer>();


Q12 Write a program to add elements to ArrayList ?

ArrayList<Integer> al = new ArrayList<Integer>();
// add elements to ArrayList

object
al.add(3);
al.add(17);
al.add(6);
al.add(9);
al.add(7);


Q13 Write a program to add elements to HashSet?

import java.util.*;
public class HashSetAddExample {
public static void main(String args[]) {
// initialize HashSet
HashSet<Integer> hs = new HashSet<Integer>();
// add elements to HashSet object
hs.add(3);
hs.add(17);
hs.add(6);
hs.add(9);
hs.add(7);
System.out.println("Using Advanced For Loop");
// printing HashSet
for (Integer num : hs) {
System.out.println(num);
}
}
}


Q14 Write a program to get size of HashMap? (Solution)

You can use the size() method of HashMap class.

Q15 How to check if HashMap is empty? (Solution)

You can check if HashMap is empty using isEmpty() method.

Intermediate level(2-7 year experience) Collection Programs in Java
Q16 Write a program to iterate the HashMap ? (Solution)

There are many ways to iterate the HashMap.The best way to iterate the HashMap is using iterator.

Q17 Write a program to sort HashMap by keys ? (Solution)

You can sort HashMap by keys using TreeMap object.

Q18 Write a program to sort ArrayList using Comparable and Comparator? (Solution)

You can sort ArrayList of Objects using Comparable and Comparator.

Q19 Write a program to sort ArrayList in descending order? (Solution)

You can sort the ArrayList in descending order using Collections.reverseOrder() method.

Q20 Write a program to add element at particular index of ArrayList? (Solution)

You can add element at particular index of ArrayList using method add(int index, Object element).

Q21 Write a program to remove element from specified index of ArrayList? (Solution)

You can remove element at particular index of ArrayList using remove(int index) method.

Q22 Write a program to convert LinkedList to ArrayList? (Solution)

Q23 Write a program to convert HashSet to Array? (Solution)

Q24 Write a program to reverse ArrayList in java? (Solution)

Q25 Write a program to iterate TreeMap in java? (Solution)

Advance Level(7+ years experience) Collection Programs in Java

Q26 Write a program to sort HashMap by value? (Solution)

Q27 How to serialize a HashMap in java? (Solution)

Q28 How to synchronize a HashMap in java? (Solution)

Q29 How to serialize an ArrayList in java? (Solution)

Q30 How to synchronize an ArrayList in java? (Solution)

Follow the process automatically you will get the outcome

https://github.com/aman0990?tab=repositories you can use my repo projects

1920. Build Array from Permutation
Easy
2.2K
240
Companies
Given a zero-based permutation nums (0-indexed), build an array ans of the same length where ans[i] = nums[nums[i]] for each 0 <= i < nums.length and return it.

A zero-based permutation nums is an array of distinct integers from 0 to nums.length - 1 (inclusive).



Example 1:

Input: nums = [0,2,1,5,3,4]
Output: [0,1,2,4,5,3]
Explanation: The array ans is built as follows:
ans = [nums[nums[0]], nums[nums[1]], nums[nums[2]], nums[nums[3]], nums[nums[4]], nums[nums[5]]]
= [nums[0], nums[2], nums[1], nums[5], nums[3], nums[4]]
= [0,1,2,4,5,3]
Example 2:

Input: nums = [5,0,1,2,3,4]
Output: [4,5,0,1,2,3]
Explanation: The array ans is built as follows:
ans = [nums[nums[0]], nums[nums[1]], nums[nums[2]], nums[nums[3]], nums[nums[4]], nums[nums[5]]]
= [nums[5], nums[0], nums[1], nums[2], nums[3], nums[4]]
= [4,5,0,1,2,3]


Constraints:

1 <= nums.length <= 1000
0 <= nums[i] < nums.length
The elements in nums are distinct.

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