如何从JAVA中的for循环的最后一次迭代中获取字符串？

Question

How can i get a string from the last iteration in this loop?

    public void Flip()
    {
        for (int i = 1; i <= numberOfFlips; i++ )
        {
            System.out.println("Flip " + i + ": " + headOrTail);
            i++;
            System.out.println("Flip " + i + ": " + headOrTail2);
        }

    }

Output for numberOfFlips = 2 is:

Flip 1: Head

Flip 2: Tail

and so on.

My purpose is to get "headOrTail" from the last iteration result and be able to do something with it. Any hints or solutions how to reach it?

Answer 1

Just ask if it is the las loop.

public void Flip()
    {
        for (int i = 1; i <= numberOfFlips; i++ )
        {
            System.out.println("Flip " + i + ": " + headOrTail);
            i++;
            System.out.println("Flip " + i + ": " + headOrTail2);
            if(i==numberOfFlips){
                <do what you want here>
            }
        }

    }

Answer 2

Your current code is already able to get the result for the last flip. Since you declared variable headOrTail outside the scope of the loop, you just have to update every flip and you can print it after the loop.

for (int i = 1; i <= numberOfFlips; i++ )
{
    headOrTail = newFlip();    //update your new flip
    System.out.println("Flip " + i + ": " + headOrTail);
}

System.out.println("My last flip: " + headOrTail );

---

Note: Your current code will always print the same flip results since you are not updating headOrTail .

how to propely create newFlip() method to use it your way?

Depending on the data type of your "flip". If you use integer to represent a flip (for example, 0 for head, 1 for tail), create a method to return a random number of 0-1.

//One of the possibilities..
public static int newFlip(){
    Random rnd = new Random();
    return rnd.nextInt(2);    //you can use Math.random() as well
}

If everything is contained within a class, you can do it as:

//Example..
class CoinTosser
{
    private static Random rnd = new Random();
    private int currentFlip;  //this is also your last flip

    public void newFlip(){
        currentFlip = rnd.nextInt(2);  //in this case, no need to return toss result
    }

    public void flipCoin(int times){
        for(int i=0, i<times; i++){
            newFlip();
            System.out.println("Attemp "+ (i+1) + ":" + currentFlip==0?"Head":"Tail");
        }
    }
}

Answer 3

Initialize a String , or a boolean , before the loop, and then overwrite it each loop and the last result will be kept in it. Or just save it with a if statement checking if it's the last loop as someone suggested.

Answer 4

Is this what you are looking for?

public void Flip()
{
    String lastInteraction = null;
    for (int i = 1; i <= numberOfFlips; i++ )
    {
        System.out.println("Flip " + i + ": " + (lastInteraction = ((i % 2) == 0 ? "Head" : "Tail"));
        if(lastInteraction.equals("Head")) {
            System.out.println("Last flip was head");
        } else {
            System.out.println("Last flip was tail");
        }
    }

}

This will store & print the last result; either Head or Tail