Author: Innovate Journey

Like if we have –  a=20; b=30; I want a=30; and b=20; SOLUTION :- package p1; public class SwapNumbers { }

SOLUTION :- package mv; import java.util.ArrayList;import java.util.Collections;import java.util.List; public class AscendingAndDescendingIntegers { }

Ans:-  flatMap()  :- flatMap()  transform each element and flattern the resulting collection into a single combined collection. Example of flatMap():- package v1;import java.util.ArrayList; import java.util.Arrays; import java.util.List;import java.util.stream.Collectors; public class FlatMapExample {public static void main(String[] args) { List<List<Integer>> list=new ArrayList<>(); …

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Solution :- we will use Map to find Count of element using stream package p2; import java.util.Arrays; import java.util.List; import java.util.Map; import java.util.stream.Collectors; public class CountOfElement { public static void main(String[] args) { List<Integer> list=Arrays.asList(1,1,2,3,3,5,5,7,8,9,9); Map<Integer,Long> map=list.stream().collect(Collectors.groupingBy(i->i,Collectors.counting())); System.out.println(map); map=map.entrySet().stream().filter(e->e.getValue()>1).collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue)); …

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SOLUTION :- package p3; public class ArrayTwoDigitCount { public static void main(String[] args) { int[] abc= {2,1,3,44,52,23}; for(int i: abc) { if(i>=10 && i<=99) { System.out.println(“Two-digit-elements :”+i); } } } } ****************************************************************

Solution :- import java.util.ArrayList; import java.util.Arrays; import java.util.List; import java.util.stream.Collectors; public class DuplicateElement { public static void main(String[] args) { List<Integer> list=Arrays.asList(1,1,2,3,3,3,5); list=list.stream().distinct().collect(Collectors.toList()); System.out.println(list); } } *****************************************************

@Controller :- @Controller is a spring MVC annotation to define a controller ,but in reality it’s just a Stereotype annotation. => You can even create a controller without @Controller by annotating the Spring MVC Classes using @Component annotation. The real …

What is the @Controller annotation used for? How can you create a controller without an annotation? Read more »