Java Interview Question: Check String is Pangram Using Java 8 Streams

April 13, 2026

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Today I have released new video on "Java Interview Question: Check String is Pangram Using Java 8 Streams"

This is frequently asked question in Java Interview.

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String str = "The quick brown fox jumps over the lazy dog";

		boolean result = false;
		
		// 1. Using Chars() + isLetter method
		result = str.toLowerCase()
					.chars()
					.filter(Character::isLetter)
					.distinct()
					.count() == 26;
		System.out.println("Using Chars() + isLetter method : is String Pangram : "+ result);
		
		
		// 2. Using Set
		Set<Character> set =
				str.toLowerCase()
					.chars()
					.mapToObj(c -> (char)c)
					.filter(Character::isLetter)					
					.collect(Collectors.toSet());
		System.out.println("Using Set : is String Pangram : "+ (set.size() == 26));
				

		// 3. Using rangeClosed and allMatch method
		result = false;
		result = IntStream.rangeClosed('a', 'z')
						.allMatch(c -> str.toLowerCase().indexOf(c) != -1);
		System.out.println("Using rangeClosed and allMatch method : is String Pangram : "+ result);
		 

		// 4. Using rangeClosed and noneMatch method
		result = false;
		result = IntStream.rangeClosed('a', 'z')
							.noneMatch(c -> str.toLowerCase().indexOf(c) == -1);
		System.out.println("Using rangeClosed and noneMatch method : is String Pangram : "+ result);

		// 5. Using rangeClosed and anyMatch method
		result = false;
		result = IntStream.rangeClosed('a', 'z')
						.anyMatch(c -> str.toLowerCase().indexOf(c) != -1);
		System.out.println("Using rangeClosed and anyMatch method : is String Pangram : "+ result);					

		// 6. Using Chaining Collections
		result = false;
		result = str.toLowerCase()
					.chars()
					.filter(Character::isLetter)
					.mapToObj(c -> (char)c)
					.collect(Collectors.collectingAndThen(Collectors.toSet(), set1 -> set1.size() == 26));
		System.out.println("Using Chaining Collections : is String Pangram : "+ result);

		// 7. Using GroupingBy
		Map<Character, Long> map =
				str.toLowerCase()
					.chars()
					.distinct()
					.filter(Character :: isLetter)
					.mapToObj(c -> (char)c)
					.collect(Collectors.groupingBy(Function.identity(), Collectors.counting()));
		System.out.println("Using GroupingBy : is String Pangram : "+ (map.size() == 26));

		// 8. Using Stream of and split method	
		result = false;
		String strDup = "abcdefghijklmnopqrstuvwxyz";
		result = Stream.of(strDup.split(""))
						.allMatch(c -> str.toLowerCase().contains(c));
		System.out.println("Using Stream of and split method: is String Pangram : "+ result);
		
Output:
Using Chars() + isLetter method : is String Pangram : true
Using Set : is String Pangram : true
Using rangeClosed and allMatch method : is String Pangram : true
Using rangeClosed and noneMatch method : is String Pangram : true
Using rangeClosed and anyMatch method : is String Pangram : true
Using Chaining Collections : is String Pangram : true
Using GroupingBy : is String Pangram : true
Using Stream of and split method: is String Pangram : true