new1.java

package August;

import java.util.Arrays;
import java.util.IntSummaryStatistics;
import java.util.List;
import java.util.stream.Collectors;

public class new1 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		// Count the empty strings 
		List<String> strList = Arrays.asList("abc", "", "bcd", "", "defg", "jk"); 
		long count = strList.stream().filter(x -> x.isEmpty()).count(); System.out.printf("List %s has %d empty strings %n", strList, count);  
		// Count String with length more than 3 
		long num = strList.stream() .filter(x -> x.length()> 3) .count(); 
		System.out.printf("List %s has %d strings of length more than 3 %n", strList, num);    
		// Count number of String which startswith "a" 
		count = strList.stream() .filter(x -> x.startsWith("a")) .count();
		System.out.printf("List %s has %d strings which startsWith 'a' %n", strList, count); 
		// Remove all empty Strings from List 
		List<String> filtered = strList.stream() .filter(x -> !x.isEmpty()) 
				.collect(Collectors.toList()); 
		System.out.printf("Original List : %s, List without Empty Strings : %s %n", strList, filtered);  
		// Create a List with String more than 2 characters 
		filtered = strList.stream() .filter(x -> x.length()> 2) .collect(Collectors.toList());
		System.out.printf("Original List : %s, filtered list : %s %n", strList, filtered);    
		// Convert String to Uppercase and join them using coma
		List<String> G7 = Arrays.asList("USA", "Japan", "France", "Germany", "Italy", "U.K.","Canada"); 
		String G7Countries = G7.stream() .map(x -> x.toUpperCase()) .collect(Collectors.joining(", ")); 
		System.out.println(G7Countries);   
		// Create List of square of all distinct numbers 
		List<Integer> numbers = Arrays.asList(9, 10, 3, 4, 7, 3, 4); 
		List<Integer> distinct = numbers.stream() .map( i -> i*i).distinct() .collect(Collectors.toList());
		System.out.printf("Original List : %s, Square Without duplicates : %s %n", numbers, distinct);   
		//Get count, min, max, sum, and average for numbers 
		List<Integer> primes = Arrays.asList(2, 3, 5, 7, 11, 13, 17, 19, 23, 29);
		IntSummaryStatistics stats = primes.stream() .mapToInt((x) -> x) .summaryStatistics(); 
		System.out.println("Highest prime number in List : " + stats.getMax()); 
		System.out.println("Lowest prime number in List : " + stats.getMin());
		System.out.println("Sum of all prime numbers : " + stats.getSum()); 
		System.out.println("Average of all prime numbers : " + stats.getAverage());
		
		//
		List<String> features = Arrays.asList("Lambdas", "Default Method", "Stream API", "Date and Time API"); 
		for (String feature : features) 
		{ 
			System.out.println(feature); 
		} 
		 //List features = Arrays.asList("Lambdas", "Default Method", "Stream API", "Date and Time API"); 
		features.forEach(n -> System.out.println(n)); 	
		// method reference is denoted by :: (double colon) operator 
		features.forEach(System.out::println);

		
		

	
	}

}