Java program to find the frequency of each character in a String.
2. Accept a sentence from the user.
3. Extract a character.
4. Count the no. of times it occurs in the sentence.
5. Print its frequency.
6. Repeat Steps 3 to 6 till all the frequencies are printed.
Enter a String : reverberate
r = 3
e = 4
v = 1
b = 1
a = 1
t = 1
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