[英]Java Math.random returning 0?
我知道這個問題已經回答過了,我看過這里: math.random,僅生成0? 以及其他一些論壇,但到目前為止無法回答我的問題。
我正在嘗試為Rock Paper Scissors游戲產生1到3之間的隨機數(包括1和3)。 不幸的是,我的隨機數的輸出始終為0。
請注意,我不允許使用Random(); 類,並且必須使用Math.random方法來實現。 這是我的隨機數代碼:
public static int randomComputerChoice(int highVal, int lowVal) {
do{
highVal = 4;
lowVal = 0;
computerChoice=0;//resets random number
//generates and returns a random number within user's range
computerChoice = (int)((Math.random()* highVal)+1);
} while((computerChoice>= highVal)||(computerChoice<= lowVal));
return (computerChoice);
}
}
我不確定這是否必要,但是我覺得錯誤可能出在我的其余代碼中。
import java.util.Scanner;
import java.io.IOException;
public class RockPaperScissors {
static int weaponChoice;
static int computerChoice;
static int lowVal = 1;
static int highVal = 3;
/**
* @param args the command line arguments
* @throws java.io.IOException
*/
public static void main(String[] args) throws IOException {
Scanner userInput = new Scanner(System.in);
System.out.println(" =========================");
System.out.println("====ROCK=PAPER=SCISSORS====");
System.out.println(" =========================");
int playAgain = 1; //sets a play again function
do {
System.out.println("Please select your weapon.");
System.out.println("1 - Rock");
System.out.println("2 - Paper");
System.out.println("3 - Scissors");
System.out.println("Choose wisely:");
String choice = userInput.nextLine();
weaponChoice = Integer.parseInt(choice);
do {
if (weaponChoice != 1 && weaponChoice != 2 && weaponChoice != 3) {
System.out.println("Please choose again, grasshopper. There are only"
+ " three choices.");
System.out.println("1 - Rock");
System.out.println("2 - Paper");
System.out.println("3 - Scissors");
choice = userInput.nextLine();
weaponChoice = Integer.parseInt(choice);
}
} while (weaponChoice != 1 && weaponChoice !=2 && weaponChoice != 3);
if (weaponChoice == 1) {
System.out.println("You have selected Rock as your weapon.");
}
else if (weaponChoice == 2) {
System.out.println("You have selected Paper as your weapon.");
}
else {
System.out.println("You have selected Scissors as your weapon.");
}
//Computer's Choice
System.out.println("The computer's choice is "+computerChoice);
} while (playAgain == 1);
}
public static int randomComputerChoice(int highVal, int lowVal) {
do{
highVal = 4;
lowVal = 0;
computerChoice=0;//resets random number
//generates and returns a random number within user's range
computerChoice = (int)((Math.random()* highVal)+1);
} while((computerChoice>= highVal)||(computerChoice<= lowVal));
return (computerChoice);
}
}
謝謝你的幫助! 非常感謝。
試試: Min + (int)(Math.random() * ((Max - Min) + 1))
。 輸出應為1到3之間的數字。最小為1,最大為3。 而已。 該數字范圍應為:[1,3],這意味着包括1和3。
這是另一個建議:
int number = 1 + (int)(Math.random() * ((3 - 1) + 1));
System.out.println(number);
//alternative way:
// return number;
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