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1. What's the difference between heap and stack? [basic]

A: the stack is a linear collection, in which the addition and deletion of elements should be completed in the same segment, and the stack is processed on a LIFO basis; the stack is a constituent element of the stack.

2. How much is Math.round? How much is Math.round (- 11.5)? [basic]

Answer: Math.round (11.5) = 12 Math.round (- 11.5) =-11

The round method returns the long integer that is closest to the parameter, and the parameter is floor after adding 1 to 2.

3. Can swtich act on byte, long and String? [basic]

Answer: in switch (expr1), expr1 is an integer expression. So the parameters passed to the switch and case statements should be int, short, char, or byte. Long,string can not act on swtich.

4. Programming problem: how much is 2 times 8 in the most efficient way? [fundamentals]

Answer: 2

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