Java错误：“else”不带“if”

我试图编译和执行一个程序，但它给了我错误：

java:20:错误：“else”没有“if” 如果roll1==roll2，则为else{ ^ java:44:错误：“else”没有“if” 如果roll1==roll2，则为else{ ^ 2个错误

请帮助检查我的代码，并让我知道我可以做什么来解决这个问题。谢谢

import java.util.Random;

public class Dice {

 public static void main(string[] args); {
   int turn;
 turn = (int) (Math.random() * 2 + 1);

  while (score1 <= 75 || score2 <= 75);

  if (turn = 1 & (roll1 != roll2)) {
   roll1 = roll1.random();
   roll2 = roll2.random();
   score1 += (roll1 + roll2);
   System.out.prinln("Player 1 rolls a" + roll1 + "and a" + roll2);
   turn = 2;
   else if (roll1 == roll2) {
    while (roll1 == roll2) {
     System.out.println("Player 1 gets to roll again");
     roll1 = roll1.random();
     roll2 = roll2.random();
     score1 += (roll1 + roll2);
     System.out.prinln("Player 1 rolls a" + roll1 + "and a" + roll2);
     score1 += (roll1 + roll2);
    }
   } 
   else {
    if (score1 >= 75) {
     System.out.println("Player 1 wins!");
     turn = 2;
    }
   }
  }

  if (turn = 2 & roll1 != roll2) {
   roll1 = roll1.random();
   roll2 = roll2.random();
   score2 += (roll1 + roll2);
   System.out.prinln("Player 2 rolls a" + roll1 + "and a" + roll2);
   turn = 1;
   else if (roll1 == roll2) {
    while (roll1 == roll2);
    System.out.println("Player 2 gets to roll again");
    score2 += (roll1 + roll2);
    roll1 = roll1.random();
    roll2 = roll2.random();
    System.out.println("Player 2 gets to roll again");
   } 
   else {
    if (score2 >= 75) {
     System.out.println("Player 2 wins!");
     turn = 1;
    }
   }
  }

 }

}

---

首先有很多语法错误，然后是if-else条件语句错误。你需要定义一个变量，没有定义就不能使用它们

其次，您需要学习如何使用类及其方法。 在调试代码时，请查看我得到了什么，并对您需要编写的代码进行了注释

请逐步了解JAVA。 这是您可以开始的链接

---

搜索一些有关编写JAVA程序的视频教程。

如果turn=1未比较，则在score1执行assignment时去掉此分号。}如果roll1==roll2，则在其他情况下去掉此分号{试着使用像Eclipse这样的IDE，它可能会给你更多的提示，告诉你你的代码出了什么问题。最好使用@ScaryWombat提到的IDE编写代码，还有其他错误，比如主方法中的string必须是string，score1，score2没有定义bla bla……嵌套如果else条件不正确，如果没有它，你就不能使用else请记住，有一行代码需要更改，并放入有效的java代码。我已经更改了代码，但我不太确定它是否可以工作。将下载IDE进行检查。

import java.util.Random; //Not used in your code, no need to import

public class Dice {

 public static void main(String[] args) {
    int turn;
    turn = (int) (Math.random() * 2 + 1);
    int score1 = 0;
    int score2 = 0;
    int roll1 = 0;
    int roll2 = 0;

  while (score1 <= 75 || score2 <= 75){

    if (turn == 1 & (roll1 != roll2)) {
        //roll1 = roll1.random(); //please correct this
        //roll2 = roll2.random(); //put correct code that you want
        score1 += (roll1 + roll2);
        System.out.println("Player 1 rolls a" + roll1 + "and a" + roll2);
        turn = 2;
    }

    else if (roll1 == roll2) {
        while (roll1 == roll2) {
         System.out.println("Player 1 gets to roll again");
         //roll1 = roll1.random();
         //roll2 = roll2.random();
         score1 += (roll1 + roll2);
         System.out.println("Player 1 rolls a" + roll1 + "and a" + roll2);
         score1 += (roll1 + roll2);
        }
     } 

      else {
        if (score1 >= 75) {
         System.out.println("Player 1 wins!");
         turn = 2;
        }
     }


    if (turn == 2 & roll1 != roll2) {
        //roll1 = roll1.random();
        //roll2 = roll2.random();
        score2 += (roll1 + roll2);
        System.out.println("Player 2 rolls a" + roll1 + "and a" + roll2);
        turn = 1;
    }

    else if (roll1 == roll2) {
          while (roll1 == roll2);
          System.out.println("Player 2 gets to roll again");
          score2 += (roll1 + roll2);
          //roll1 = roll1.random();
          //roll2 = roll2.random();
          System.out.println("Player 2 gets to roll again");
     } 
    else {
          if (score2 >= 75) {
           System.out.println("Player 2 wins!");
           turn = 1;
          }
     }

  }

 }

}

if(condition1){  
//code to be executed if condition1 is true  
}else if(condition2){  
//code to be executed if condition2 is true  
}  
else if(condition3){  
//code to be executed if condition3 is true  
}  
...  
else{  
//code to be executed if all the conditions are false  
}