Percentage chance of saying something?

Question

How do I make it so ..

• 80% of the time it will say sendMessage(\"hi\");
• 5 % of the time it will say sendMessage(\"bye\");
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Answer 1

For cases like this it is usually best to generate one random number and select the case based on that single number, like so:

int foo = Math.random() * 100;
if (foo < 80) // 0-79
    sendMessage("hi");
else if (foo < 85) // 80-84
    sendMessage("bye");
else // 85-99
    sendMessage("test");