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

Something like this would be much more readable IMO:

if( Math.random() >= probabilityOfDoingNothing ){

    if( Math.random() < 0.6 ){
        action1;
    }else{
        action2;
    }
}

Re. your question about cases, the following is equivalent to your code:

Random rand = new Random(50);
switch(rand.nextInt()) 
{
    case 1:
    case 2:
    case 3:
    case 4:
    case 5:
    case 6:
    {
        do action 1
    }
    break;
    case 7:
    case 8:
    case 9:
    case 10:
    {
        do action 2
    }
    break;  
}