两个操作如何在if-else if语句中？

时间：2013-11-03 10:01:56

标签： java if-statement

我正在尝试制作一个简单的足球模拟程序，但是我有一个相互匹配的问题。 if语句在找到一个条件后退出循环。但我想做两个条件和两个操作。有可能吗？

package soccer.simulator;
import java.util.Random;
/**
 * @author Sertac
 */
public class SoccerSimulator {
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        int HomeTeamScore = 0;
        int AwayTeamScore = 0;
        Random randomGenerator = new Random();

        String HomeTeam = new String();
        String AwayTeam = new String();
        int HomeTeamID = randomGenerator.nextInt(10);
        int AwayTeamID = randomGenerator.nextInt(10);

        if(HomeTeamID == AwayTeamID){
            while (HomeTeamID != AwayTeamID){
                AwayTeamID = randomGenerator.nextInt(10);
            }
        }

        if(HomeTeamID == 0 || AwayTeamID == 0){
            if(HomeTeamID == 0){
                HomeTeam = "Arsenal";
            }else{
                AwayTeam = "Arsenal";
            }
        } else if(HomeTeamID == 1 || AwayTeamID == 1){
            if(HomeTeamID == 1){
                HomeTeam = "Barcelona";
            }else{
                AwayTeam = "Barcelona";
            }
        } else if(HomeTeamID == 2 || AwayTeamID == 2){
            if(HomeTeamID == 2){
                HomeTeam = "Bayern Munich";
            }else{
                AwayTeam = "Bayern Munich";
            }
        } else if(HomeTeamID == 3 || AwayTeamID == 3){
            if(HomeTeamID == 3){
                HomeTeam = "Chelsea";
            }else{
                AwayTeam = "Chelsea";
            }
        } else if(HomeTeamID == 4 || AwayTeamID == 4){
            if(HomeTeamID == 4){
                HomeTeam = "Borussia Dortmund";
            }else{
                AwayTeam = "Borussia Dortmund";
            }
        } else if(HomeTeamID == 5 || AwayTeamID == 5){
            if(HomeTeamID == 5){
                HomeTeam = "Galatasaray";
            }else{
                AwayTeam = "Galatasaray";
            }
        } else if(HomeTeamID == 6 || AwayTeamID == 6){
            if(HomeTeamID == 6){
                HomeTeam = "Juventus";
            }else{
                AwayTeam = "Juventus";
            }
        } else if(HomeTeamID == 7 || AwayTeamID == 7){
            if(HomeTeamID == 7){
                HomeTeam = "Manchester United";
            }else{
                AwayTeam = "Manchester United";
            }
        } else if(HomeTeamID == 8 || AwayTeamID == 8){
            if(HomeTeamID == 8){
                HomeTeam = "Milan";
            }else{
                AwayTeam = "Milan";
            }
        } else if(HomeTeamID == 9 || AwayTeamID == 9){
            if(HomeTeamID == 9){
                HomeTeam = "Real Madrid";
            }else{
                AwayTeam = "Real Madrid";
            }
        }

        //Generating each random integers in range 0..99 for 90 minutes
        for(int minutes = 0; minutes <= 90; minutes++){
            int randomInt = randomGenerator.nextInt(100);

            //if random int equals 0,1,2 home team scores
            if(randomInt < 3){ HomeTeamScore = HomeTeamScore + 1; }

            //if random int equals 98,99 away team scores
            //home team has 1 more int because playing at home is better
            if(randomInt > 97){ AwayTeamScore = AwayTeamScore + 1; }                         
        }
        System.out.println ("Simulation for match of the week:");
        System.out.println (HomeTeam + " " + HomeTeamScore + " - " + AwayTeamScore + " " + AwayTeam);

        }   
    }

输出是： 3 - 1 Arsenal

或： Arsenal 2 - 1

5 个答案:

答案 0 :(得分：5)

您只设置一个团队名称，因为根本没有循环，在您的巨大if-else语句中只有一个最终条件成立。一种更简单的方法（并且非常值得推荐，以便在不久的将来为其他任何会触及您的代码的人保持理智）将您的团队名称存储在一个数组中.- 

String[] teamNames = new String[] {"Arsenal", "Barcelona", "Bayern Munich", "Chelsea", "Borussia Dortmund", "Galatasaray", "Juventus", "Manchester United", "Milan", "Real Madrid"};

然后将整个if-else替换为.- 

HomeTeam = teamNames[HomeTeamID];
AwayTeam = teamNames[AwayTeamID];

作为旁注，你应该坚持使用变量命名的java约定，并使用小写的camelCase（homeTeam，awayTeam，homeTeamID，awayTeamId）。< / p>

答案 1 :(得分：2)

将else if更改为if

试

import java.util.Random;
/**
 * @author Sertac
 */
public class SoccerSimulator {
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        int HomeTeamScore = 0;
        int AwayTeamScore = 0;
        Random randomGenerator = new Random();

        String HomeTeam = new String();
        String AwayTeam = new String();
        int HomeTeamID = randomGenerator.nextInt(10);
        int AwayTeamID = randomGenerator.nextInt(10);

        if(HomeTeamID == AwayTeamID){
            while (HomeTeamID != AwayTeamID){
                AwayTeamID = randomGenerator.nextInt(10);
            }
        }

        if(HomeTeamID == 0 || AwayTeamID == 0){
            if(HomeTeamID == 0){
                HomeTeam = "Arsenal";
            }else{
                AwayTeam = "Arsenal";
            }
        }  if(HomeTeamID == 1 || AwayTeamID == 1){
            if(HomeTeamID == 1){
                HomeTeam = "Barcelona";
            }else{
                AwayTeam = "Barcelona";
            }
        }  if(HomeTeamID == 2 || AwayTeamID == 2){
            if(HomeTeamID == 2){
                HomeTeam = "Bayern Munich";
            }else{
                AwayTeam = "Bayern Munich";
            }
        }  if(HomeTeamID == 3 || AwayTeamID == 3){
            if(HomeTeamID == 3){
                HomeTeam = "Chelsea";
            }else{
                AwayTeam = "Chelsea";
            }
        }  if(HomeTeamID == 4 || AwayTeamID == 4){
            if(HomeTeamID == 4){
                HomeTeam = "Borussia Dortmund";
            }else{
                AwayTeam = "Borussia Dortmund";
            }
        }  if(HomeTeamID == 5 || AwayTeamID == 5){
            if(HomeTeamID == 5){
                HomeTeam = "Galatasaray";
            }else{
                AwayTeam = "Galatasaray";
            }
        }  if(HomeTeamID == 6 || AwayTeamID == 6){
            if(HomeTeamID == 6){
                HomeTeam = "Juventus";
            }else{
                AwayTeam = "Juventus";
            }
        }  if(HomeTeamID == 7 || AwayTeamID == 7){
            if(HomeTeamID == 7){
                HomeTeam = "Manchester United";
            }else{
                AwayTeam = "Manchester United";
            }
        }  if(HomeTeamID == 8 || AwayTeamID == 8){
            if(HomeTeamID == 8){
                HomeTeam = "Milan";
            }else{
                AwayTeam = "Milan";
            }
        }  if(HomeTeamID == 9 || AwayTeamID == 9){
            if(HomeTeamID == 9){
                HomeTeam = "Real Madrid";
            }else{
                AwayTeam = "Real Madrid";
            }
        }

        //Generating each random integers in range 0..99 for 90 minutes
        for(int minutes = 0; minutes <= 90; minutes++){
            int randomInt = randomGenerator.nextInt(100);

            //if random int equals 0,1,2 home team scores
            if(randomInt < 3){ HomeTeamScore = HomeTeamScore + 1; }

            //if random int equals 98,99 away team scores
            //home team has 1 more int because playing at home is better
            if(randomInt > 97){ AwayTeamScore = AwayTeamScore + 1; }                         
        }
        System.out.println ("Simulation for match of the week:");
        System.out.println (HomeTeam + " " + HomeTeamScore + " - " + AwayTeamScore + " " + AwayTeam);

        }   
    }

答案 2 :(得分：0)

问题在于：

if(HomeTeamID == 0 || AwayTeamID == 0){
            if(HomeTeamID == 0){
                HomeTeam = "Arsenal";
            }else{
                AwayTeam = "Arsenal";
            }
        } else if(HomeTeamID == 1 || AwayTeamID == 1){
            if(HomeTeamID == 1){
                HomeTeam = "Barcelona";
            }else{
                AwayTeam = "Barcelona";
            }
        } else if(HomeTeamID == 2 || AwayTeamID == 2){
            if(HomeTeamID == 2){
                HomeTeam = "Bayern Munich";
            }else{
                AwayTeam = "Bayern Munich";
            }
        } else if(HomeTeamID == 3 || AwayTeamID == 3){
            if(HomeTeamID == 3){
                HomeTeam = "Chelsea";
            }else{
                AwayTeam = "Chelsea";
            }
        } else if(HomeTeamID == 4 || AwayTeamID == 4){
            if(HomeTeamID == 4){
                HomeTeam = "Borussia Dortmund";
            }else{
                AwayTeam = "Borussia Dortmund";
            }
        } else if(HomeTeamID == 5 || AwayTeamID == 5){
            if(HomeTeamID == 5){
                HomeTeam = "Galatasaray";
            }else{
                AwayTeam = "Galatasaray";
            }
        } else if(HomeTeamID == 6 || AwayTeamID == 6){
            if(HomeTeamID == 6){
                HomeTeam = "Juventus";
            }else{
                AwayTeam = "Juventus";
            }
        } else if(HomeTeamID == 7 || AwayTeamID == 7){
            if(HomeTeamID == 7){
                HomeTeam = "Manchester United";
            }else{
                AwayTeam = "Manchester United";
            }
        } else if(HomeTeamID == 8 || AwayTeamID == 8){
            if(HomeTeamID == 8){
                HomeTeam = "Milan";
            }else{
                AwayTeam = "Milan";
            }
        } else if(HomeTeamID == 9 || AwayTeamID == 9){
            if(HomeTeamID == 9){
                HomeTeam = "Real Madrid";
            }else{
                AwayTeam = "Real Madrid";
            }
        }

由于您在这里使用了错误的构造，因此U总是只分配一个团队，无论是家庭团队还是远程团队。尝试类似：

switch(HomeTeamID)
{
case 0: HomeTeam = "Arsenal";
        break;
case 1: HomeTeam = "Barcelona";
...
break
}

和客队相同：

switch(HomeTeamID)
{
case 0: AwayTeam = "Arsenal";
        break;
case 1: AwayTeam = "Barcelona";
...
break
}

你应该检查java代码约定。变量名应该以小写开头。

答案 3 :(得分：0)

如果使用if，则替换else，并且代码应该正常工作。

答案 4 :(得分：0)

我会从一开始就开始。你想做什么。

考虑到一些球队，你想选择两个随机球队互相比赛，一个回家，一个回家。

目前，您正在从int中选择两个随机Random ID，并使用这些ID来查找隐含的一组团队中的团队。

所以，首先使用@ssantos的建议 - 使数组显式化并简单地从那里获取索引。

但是，我们有一个问题 - 一个团队无法发挥自己。所以实际上我们需要一种稍微不同的方法。您需要做的是获取所有团队的数组，将其洗牌，然后从数组中读取对。事实上，这种选择往往会在锦标赛中发挥作用。

以下是我建议的代码：

private static final String[] TEAM_NAMES = new String[]{"Arsenal", "Barcelona", "Bayern Munich", "Chelsea", "Borussia Dortmund", "Galatasaray", "Juventus", "Manchester United", "Milan", "Real Madrid"};
private static final Random RANDOM = new Random();

public static void main(final String args[]) {
    List<String> teams = new ArrayList<>(Arrays.asList(TEAM_NAMES));
    while (teams.size() > 1) {
        teams = playRound(teams);
    }
    System.out.println("The champion is " + teams);
}

public static List<String> playRound(final List<String> teams) {
    Collections.shuffle(teams);
    final Iterator<String> teamsIter = teams.iterator();
    final List<String> winners = new ArrayList<>();
    while (teamsIter.hasNext()) {
        final String winner = play(teamsIter.next(), teamsIter.next());
        winners.add(winner);
    }
    return winners;
}

public static String play(final String team1, final String team2) {
    return RANDOM.nextBoolean() ? team1 : team2;
}

从顶部开始：

首先我们声明常量 - 团队数组和Random实例。这些变量为static final，因此它们以BLOCK_CAPITALS命名。

主要

接下来我们有main方法。这种方法需要团队并将其读入List。我们需要制作团队的副本，这样我们就不会乱搞团队阵列。 List是一种更灵活的结构，您稍后会看到。另请注意，你需要两支球队的力量 - 如果球队成对比赛，那么你需要一个可以在每轮中被2整除的数字。

该方法现在进入while循环。这种结构让每一轮的所有胜利球队相互对抗，直到最终获胜者 - 锦标赛冠军。它打印出冠军的名字。

<强> playRound

这就是魔术发生的地方。

方法首先shuffles传入的团队，以便随机检索它们。然后它获取Iterator的{​​{1}} - 这允许您按元素遍历List元素。如果没有偶数的团队，这也是错误发生的地方 - 第二个List会抛出next()。

然后该方法进入另一个NoSuchElementException循环 - 当while不为空时，它会调用Iterator两个团队。它将获奖团队纳入play winners。这是最后返回的List。

不是List有一个List方法，以便您可以动态填充它 - 这与具有固定大小的数组不同。

播放

这是您实际模拟的地方。目前，它随机选择一名获胜者 - 您可以将当前的方法放入。

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