JavaBasics

package com.java.basicprograms; public class DuplicateChar { public static void main(String[] args) { String str = "maheshbabu"; int length = str.length(); char[] ch = str.toCharArray(); for (int i = 0; i < length; i++) { for (int j = i + 1; j < length; j++) { if (ch[i] == ch[j]) { System.out.println("Duplicate characters are:    " + ch[j]); break; } } } } }

package com.java.basicprograms; import java.util.*; public class CoronaVirusTest { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.println("Enetr patient symptoms"); String str = sc.nextLine(); String[] word = str.split(" "); boolean isTrue = false; List<String> dList = new ArrayList<String>(); dList.add("cough"); dList.add("fever"); dList.add("tiredness"); dList.add("difficultybreathing"); for (int i = 0; i < word.length; i++) { if (dList.contains(word[i])) { isTrue = true; } else { isTrue = false; } } if (isTrue) { System.out.println("The Patient need to go for Corona Test"); } else { System.out.println("The Patient doesnot have Corona"); } } }

package com.java.basicprograms; import java.io.File; import javax.xml.bind.JAXBContext; import javax.xml.bind.JAXBException; import javax.xml.bind.Unmarshaller; public class ConvertXMLInToJava { public static void main(String[] args) { try { JAXBContext context  = JAXBContext.newInstance(Item.class); Unmarshaller unmarshaller = context.createUnmarshaller(); File file = new File("E:/item.xml"); Item item = (Item) unmarshaller.unmarshal(file); System.out.println(item); } catch (JAXBException e) { e.printStackTrace(); } } }

package com.java.basicprograms; import java.io.File; import javax.xml.bind.JAXBContext; import javax.xml.bind.JAXBException; import javax.xml.bind.Marshaller; import javax.xml.bind.Unmarshaller; public class ConvertJavaObjectInToXML { public static void main(String[] args) { Item item = new Item(); item.setItemId(101); item.setItemName("Laptop"); item.setItemDesc("Lenovo Laptop"); item.setItemPrice(25000.0); try { JAXBContext context = JAXBContext.newInstance(Item.class);     Marshaller marshaller = context.createMarshaller(); marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true); marshaller.marshal(item,new File("E:/item.xml")); marshaller.marshal(item, System.out); } catch(JAXBException  e) { e.printStackTrace(); } //Convert XML into Java Object try { JAXBContext context = JAXBContext.newInstance(Item.class); Unmarshaller unmarshaller = context.createUnmar...

package com.java.basicprograms; import java.util.*; public class CapitalizeFirstLetter { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.println("Enter String data"); String str = sc.nextLine(); String upperCase = " "; Scanner scaner = new Scanner(str); while (scaner.hasNext()) { String word = scaner.next(); upperCase += Character.toUpperCase(word.charAt(0)) + word.substring(1) + " "; } System.out.println(upperCase.trim()); } }

package com.java.basicprograms; import java.util.*; public class Calculator { public static void main(String[] args) { Double num1, num2, result; Scanner sc = new Scanner(System.in); System.out.println("Enetr num1"); num1 = sc.nextDouble(); System.out.println("Enetr num2"); num2 = sc.nextDouble(); System.out.println("Enter operator"); char operator = sc.next().charAt(0); switch (operator) { case '+': result = num1 + num2; break; case '-': result = num1 - num2; break; case '*': result = num1 * num2; break; case '/': result = num1 / num2; break; default: System.out.println("Entered wrong operator"); return; } System.out.println(num1 + " " + operator + " " + num2 + ":   Result is:" + result); } }