Exception in thread main java.lang.IllegalArgumentException: bound must be greater than origin

先认识下IllegalArgumentException, 它有3个messages, 我们遇到的正式BadRange.

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static final String BadBound = "bound must be positive";
static final String BadRange = "bound must be greater than origin";
static final String BadSize = "size must be non-negative";

以nextLong为例, 正是因为origin>=bound, 才触发了此Exception

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/**
* Returns a pseudorandom {@code long} value between the specified
* origin (inclusive) and the specified bound (exclusive).
*
* @param origin the least value returned
* @param bound the upper bound (exclusive)
* @return a pseudorandom {@code long} value between the origin
* (inclusive) and the bound (exclusive)
* @throws IllegalArgumentException if {@code origin} is greater than
* or equal to {@code bound}
*/
public long nextLong(long origin, long bound) {
if (origin >= bound)
throw new IllegalArgumentException(BadRange);
return internalNextLong(origin, bound);
}
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