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Browse CoursesGiven two strings needle and haystack, return the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack. Example 1: Input: haystack = “sadbutsad”, needle = “sad” Output: 0 Explanation: “sad” occurs at index 0 and 6. The first occurrence is at index 0, so we […]
Given a non-empty array of integers nums[], every element appears twice except for one. Find that single one. Input: nums = [2,2,1] Output: 1 Example 2: Input: nums = [4,1,2,1,2] Output: 4 ——————————— public class Main { public static int SingleNumber(int[] nums)//2,2,1 { int result = 0; for (int num : nums) […]
Given an integer array nums[], rotate the array to the right by k steps, where k is non-negative. Example 1: Input: nums = [1,2,3,4,5,6,7], k = 3 Output: [5,6,7,1,2,3,4] Explanation: rotate 1 steps to the right: [7,1,2,3,4,5,6] rotate 2 steps to the right: [6,7,1,2,3,4,5] rotate 3 steps to the right: [5,6,7,1,2,3,4] ————————————————– class […]
Create an interface Printable with a method print(), implement this interface in classes Document and photo interface Printable { void print(); } class Document implements Printable { void print() { System.out.println(“Document printed”); } } class Photo implements Printable { void print() { System.out.println(“Photo printed”); } } class Main { public static […]
Create a class Rectangle with attributes length and width. Use a constructor to initialize values and calculate the area class Rectangle { int length, width; Rectangle(int l,int w) { length=l; width=w; } int area() { return length*width; } } class Main { public static void main(String args[]) { Rectangle r=new Rectangle(10,2); System.out.println(“Area=” […]
Create a student class with name, roll number. Use a constructor to initialize and display the student details class Student { String name; int rollNo; Student(String name,int rollNo) { this.name=name; this.rollNo=rollNo; } void display() { System.out.println(name); System.out.println(rollNo); } } class Main { public static void main(String args[]) { Student s1=new Student(“John”,101); […]
Create a student class with attributes name, roll number and marks. create 2 student objects and display their details class Student { String name; int rollNo; int marks; void display() { System.out.println(“Name=” +name); System.out.println(“Roll no=” +rollNo); System.out.println(“Marks=” +marks); } } class Main { public static void main(String args[]) { Student s1=new Student(); […]
Types of methods: class Methods { public void add()//without returntype/without argument { int a=123; int b=10; System.out.println(“Addition=” +(a+b)); } } class Functiondemo { public static void main(String args[]) { Methods o=new Methods();//classname objectname=new classname(); o.add(); } } import java.util.*; class Methods { public void sub(int x,int y)//without returntype/with /arguments { System.out.println(“Subtraction=” +(x-y)); } […]
Here is a simple and short Java program to find the sum of all nodes in a binary tree using recursion: ✅ Java Code: Sum of All Nodes (Minimal Version) class Node { int data; Node left, right; Node(int data) { this.data = data; } } public class SumOfNodes { int sum(Node node) […]
Java Code: Count Leaf Nodes (Minimal Version) Here is a short and simple Java code to count the number of leaf nodes in a binary tree using recursion: ✅ Java Code: Count Leaf Nodes (Minimal Version class Node { int data; Node left, right; Node(int data) { this.data = data; } } public […]
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