Core Java 面试题与答案
Test your skills through the online practice test: Core Java Quiz Online Practice Test
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问题 221. Can a Byte object be cast to a double value?
No, an object cannot be cast to a primitive value.
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问题 222. How is rounding performed under integer division?
The fractional part of the result is truncated. This is known as rounding toward zero.
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问题 223. What would you use to compare two String variables - the operator == or the method equals()?
I would use the method equals() to compare the values of the Strings and the == to check if two variables point at the same instance of a String object.
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问题 224. Which non-Unicode letter characters may be used as the first character of an identifier?
The non-Unicode letter characters $ and _ may appear as the first character of an identifier
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问题 225. What is a hashCode?
hash code value for this object which is unique for every object.
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