Feature/one liners stream2

src/basicCodes/Java8Features.java

@@ -7,8 +7,8 @@
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
-import static java.util.stream.Collectors.groupingBy;
-import static java.util.stream.Collectors.toList;
+import static java.util.stream.Collectors.*;
+import static java.util.stream.Collectors.*;
 
 public class Java8Features {
     public static void main(String args[]){
@@ -123,12 +123,12 @@ public static void main(String args[]){
 
 //       System.out.println( personList.stream().map(Person::getAge).reduce(0,Integer.sum()); not possible
 
-//         System.out.println( personList.stream().mapToInt(Person::getAge).sum());
-//
-//         List<String> names2 = personList.stream().filter(person -> person.getAge() >30)
-//                 .map(person -> person.getName().toUpperCase())
-//                 .collect(toList());
-//
+         System.out.println( personList.stream().mapToInt(Person::getAge).sum());
+
+         List<String> names2 = personList.stream().filter(person -> person.getAge() >30)
+                 .map(person -> person.getName().toUpperCase())
+                 .collect(toList());
+
          Set<String> malesList = personList.stream()
                                       .filter(person -> person.getAge() > 30)
                                       .filter(person ->person.getGender() == Gender.MALE)
@@ -146,6 +146,24 @@ public static void main(String args[]){
 
         System.out.println(personGrpMap);
 
+        System.out.println(personList.stream().max((Person1, Person2)-> Person1.getAge()>Person2.getAge() ? 1:-1));
+
+        System.out.println(personList.stream().min((Person1, Person2)-> Person1.getAge()>Person2.getAge() ? 1:-1));
+
+
+
+
+        String str = "abcdABCDabcd";
+        Map<Character, Integer> frequency =
+                str.chars()
+                        .mapToObj(c -> (char)c)
+                        .collect(Collectors.groupingBy(Function.identity(), Collectors.summingInt(c -> 1)));
+        System.out.println(frequency);
+
+        List<Integer> list1 = Arrays.asList(1,2,3,3,4,4,4,5);
+
+        System.out.println(list1.stream().collect(Collectors.groupingBy(Function.identity(), counting())));
+
     }
 
         }

src/basicCodes/Person.java

@@ -4,6 +4,8 @@ public class Person {
     String name;
     int age;
 
+    Gender gender;
+
     @Override
     public String toString() {
         return "Person{" +
@@ -13,8 +15,6 @@ public String toString() {
                 '}';
     }
 
-    Gender gender;
-
     public Person(String name, Gender gender, int i) {
          this.name=name;
          this.gender = gender;

src/basicCodes/Practice.java

@@ -0,0 +1,56 @@
+package basicCodes;
+
+import java.util.*;
+import java.util.function.Function;
+import java.util.stream.Collectors;
+import java.util.stream.IntStream;
+
+public class Practice {
+    public static void main(String[] args)
+    {
+//        List<Integer> arrLst = Arrays.asList(10,15,8,49,25,98,98,32,15);
+//        List<String>  strLst = Arrays.asList("Pune","Solapur","Nasik","Satara","Sangali","Kolhapur");
+//
+//        System.out.println(strLst.stream().filter(s -> s.length() < 5).collect(Collectors.toList()));
+//
+//        System.out.println(new HashSet<>(arrLst));
+//
+//        List<Person> personlist = new ArrayList<>();
+//
+//        personlist.add(new Person("Subhram", Gender.MALE, 26));
+//        personlist.add(new Person("Srabani", Gender.FEMALE, 56));
+//        personlist.add(new Person("Moumita", Gender.FEMALE, 36));
+//        personlist.add(new Person("Subhendu", Gender.MALE, 66));
+//        personlist.add(new Person("Rakesh", Gender.MALE, 26));
+//
+//        System.out.println(personlist.stream().sorted(Comparator.comparing(Person::getName)).collect(Collectors.toList()));
+//
+//        IntStream.rangeClosed(1,10).forEach(System.out::println);
+//
+//        String str = "abcdABCDabcd";
+//        Map<Character, Integer> frequency =
+//                str.chars()
+//                        .mapToObj(c -> (char)c)
+//                        .collect(Collectors.groupingBy(Function.identity(), Collectors.summingInt(c -> 1)));
+//        System.out.println(frequency);
+
+        Map<Character, Integer> map = new HashMap<Character, Integer>();
+        String s = "aasjajikkk";
+        for (int i = 0; i < s.length(); i++) {
+            char c = s.charAt(i);
+            Integer val = map.get(c);
+            if (val != null) {
+                map.put(c, val + 1);
+            }
+            else {
+                map.put(c, 1);
+            }
+        }
+
+
+
+
+    }
+}
+
+