class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		String s1 = "   ";
		// length / emptiness
		System.out.println(s1.length());
		System.out.println(s1.isEmpty());
		System.out.println(s1.isBlank()); // checks a string other than white spaces
 
		String s2 = "Hello";
		// character access
		System.out.println(s2.charAt(3));
		System.out.println(s2.toCharArray());
 
		String s3 = "hello";
		String s4 = "HELLO";
		// comparisons
		System.out.println(s3.equals(s4));
		System.out.println(s3.equalsIgnoreCase(s4));
		System.out.println(s3.compareTo(s4));
		// compares the lexicographical values with ASCII
		// compareTo -> -ve, 0, +ve
		// -ve if s3 is smaller than s4 lexicographically
		// 0 if strings are same
		// +ve if s3 is greater than s4 lexicographically
		System.out.println(s2.compareTo(s3));
	}
}

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