Java I/O Programming: Exercises, Practice, Solution
Java Input-Output Exercises [18 exercises with solution]
6. Write a Java program to compare two files lexicographically. Go to the editor
According to Wikipedia:
In mathematics, the lexicographic or lexicographical order (also known as lexical order, dictionary order, alphabetical order or lexicographic(al) product) is a generalization of the way the alphabetical order of words is based on the alphabetical order of their component letters. This generalization consists primarily in defining a total order over the sequences (often called words in computer science) of elements of a finite totally ordered set, often called alphabet.
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Java: Tips of the Day
Why is (a*b != 0) faster than (a != 0 && b != 0) in Java?
if (a != 0 && b != 0)
will compile to 2 memory loads and two conditional branches
if (a * b != 0)
will compile to 2 memory loads, a multiply and one conditional branch.
The multiply is likely to be faster than the second conditional branch if the hardware-level branch prediction is ineffective. As you increase the ratio ... the branch prediction is becoming less effective.
The reason that conditional branches are slower is that they cause the instruction execution pipeline to stall. Branch prediction is about avoiding the stall by predicting which way the branch is going to go and speculatively choosing the next instruction based on that. If the prediction fails, there is a delay while the instruction for the other direction is loaded.
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