Explain the internal workings of Java 8 Streams and how you would use streams to count the occurrences of each character in a string and format the output (for example, transforming "aabca" into "aa3b1c1").
Problem
Explain the internal workings of Java 8 Streams and how you would use streams to count the occurrences of each character in a string and format the output (for example, transforming "aabca" into "aa3b1c1").
Your answer
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