Create StreamFilterOperations.java

Author: iamtech

src/com/features/java8/StreamFilterOperations.java

@@ -0,0 +1,69 @@
+package com.code.Arrays;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.stream.Collectors;
+
+public class StreamFilterOperations {
+
+	public static void main(String[] args) {
+		
+		List<Integer> li = new ArrayList<>();
+		li.add(10);
+		li.add(50);
+		li.add(20);
+		li.add(30);
+		
+		List<Integer> lst = li.stream().filter(i -> i > 20).collect(Collectors.toList()); 
+		
+		lst.forEach(x -> System.out.println(x));
+		
+		System.out.println("------------------------------------------------------");
+		//
+		
+		List<PersonBean> person = new ArrayList<>();
+		person.add(new PersonBean(1001,"tim",5685.10));
+		person.add(new PersonBean(1002,"stine",6685.10));
+		person.add(new PersonBean(1003,"adam",5675.10));
+		person.add(new PersonBean(1004,"kingsly",6785.20));
+		person.add(new PersonBean(1005,"torrento",8985.40));
+		
+		person.stream().filter(p -> p.getId() == 1003).forEach(p -> System.out.println(p.getName()));
+		
+		String pname = person.stream().filter(p -> p.getId() == 1003).map(s -> s.getName()).reduce("", String::concat);
+		String pnamea = person.stream().filter(p -> p.getId() == 1003).map(s -> s.getName()).collect(Collectors.joining(""));
+		System.out.println(pname);
+		System.out.println(pnamea);
+		String idname = person.stream().filter(p -> p.getSalary() == 8985.40).map(s -> s.getId()+","+s.getName()).collect(Collectors.joining(""));
+		System.out.println(idname);
+		
+		System.out.println("------------------------------------------------------");
+		
+		PersonBean updperson = person.stream().filter(p -> p.getName().equals("stine")).findAny().orElse(null);
+		System.out.println(updperson.toString());
+		
+		System.out.println("------------------------------------------------------");
+		
+		double sal = person.stream().filter(p -> { if(p.getName().equals("tim") && p.getId() == 1001)
+													return true;
+		return false;
+		}).collect(Collectors.averagingDouble(v -> v.getSalary()));
+		
+		System.out.println(sal);
+		
+		double sala = person.stream().filter(p -> { if(p.getName().equals("tim") && p.getId() == 1001)
+															return true;
+												return false;
+												}).map(p -> p.getSalary()).findAny().orElse(null);
+		
+		System.out.println(sala);
+		
+		System.out.println("------------------------------------------------------");
+		
+		String all = li.stream().sorted().map(i -> String.valueOf(i)).collect(Collectors.joining(","));
+		System.out.println(all);
+		
+	}
+	
+
+}