打印方法[重复]中的编译错误

Question

abstract class Motor{
        int fuel;
        int getFuel(){
            return this.fuel;
        }
        abstract void run();
    }

   public class Player extends Motor {
       void run(){
           print("wroooooom");

//  public static void main(String[] args) {               
        }

    private void print(String string) {
        return string; // Void methods cannot return a value
    }
 }

Answer 1

您已经编写了以下代码：

private void print(String string) {
        return string; 
    }

但是void这里是返回类型。这意味着您不能返回任何东西。如果您编写string而不是void，那么这将意味着返回类型将是一个字符串，而错误将消失。

应该是这样的：

private String print(String string) {
        return string; 
    }

abstract class Motor{
        int fuel;
        int getFuel(){
            return this.fuel;
        }
        abstract void run();
    }

   public class Player extends Motor {
       public void run(){
           print("wroooooom");//calling print method to print passed string
        }

    public void print(String string) {
        System.out.print(string);
    }

  public static void main(String []args){
    Player p1 = new Player();//creating a object of Player class to access its methods
    p1.run();//calling the run method
    }
}