Java, questions about switches and cases?

Question

So I want to do a certain action 60 % of the time and another action 40% of the time. And sometimes have it doing neither. The best way I can think to do this is through switche

Answer 1

Random rand = new Random(50);

int n = rand.nextInt(11);

if(n<=6)
   do action 1
else
   do action 2

You need to use nextInt(n) to generate a number between 0 (inclusive) and n (exclusive). In this case we use 11 which gives us a number between 0 and 10. Anything below 6 (60% chance) we do action 1 otherwise do action 2.

See this for more details on the Random class.

Using a switch statement is only useful if you have a lot of actions you want to perform, where the action performed depends on something. For example a different action is performed based on the current month. Its quicker than writing if-else statements.