java - 计算平均值时意外的返回值？

Question

我无法在我的 getter 方法中返回“平均”变量的值。我一直收到错误“不兼容的类型:意外的返回值”，但该值是在上面的 setter 方法中定义的吗？

我找过类似的问题，但找不到与此相近的问题

public class Student {

    private String firstName;
    private String lastName;
    private int score1, score2, score3;
    private int average;



      public void setFirstName(String name){
      firstName = name;
    }
      public String getFirstName(){
      return firstName;
    }
      public void setLastName(String name){
      lastName = name;
    }
      public String getLastName(){
      return lastName;
    }
      public void setScore1(String newvalue){
      score1 = Integer.parseInt(newvalue);
    }
      public int getScore1(int newvalue){
      return score1;
    }
      public void setScore2(String newvalue){
      score2 = Integer.parseInt(newvalue);
    }
      public int getScore2(int newvalue){
      return score2;
    }
      public void setScore3(String newvalue){
      score3 = Integer.parseInt(newvalue);
    }
      public int getScore3(int newvalue){
      return score3;
    }
      public int setAverage(int newvalue){
      average = (score1 + score2 + score3)/3;
    }
      public void getAverage(String newvalue){
      return average;
    } 
}

Answer 1

因为您的 getAverage(String newvalue) 方法有一个函数定义，其返回类型为 void，并且您要从该方法返回值。

Any method having return type set as void in the function definition/declaration isn't supposed to return any value.

请更正为:-

public int getAverage(String newvalue){
  return average;