What does the "<<" symbol in java mean?

Mathematical meaning: As long as the number does not overflow, for positive and negative numbers, shifting one position to the left is equivalent to multiplying by 2 raised to the power of 1, and shifting n bits to the left is equivalent to multiplying n by 2. second power.

##For example:

Calculation: 3 3 1. First convert 3 into binary numbers 0000 0000 0000 0000 0000 0000 0000 0011.

2. Then move out the two zeros in the high bits (left) of the number, shift the other numbers 2 bits to the left, and finally fill in the two empty bits in the low bits (right) with zeros.

3. The final result is 0000 0000 0000 0000 0000 0000 0000 1100, which is 12 when converted to decimal.

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