调试一程序
import   java.util.*;
interface   fly{
void   start();
void   land();}

class   Airplane   implements   fly{
int   meal;
int   lunch;

public   void   start(int   a){
meal=a;

}

public   void   land(int   b)
{lunch=b;}

int   getstart(){return   meal;}
int   getland(){return   lunch;}
}


public   class   Ok{

public   static   void   main(String[]   args){
Airplane   c=new   Airplane();
c.start(10);
c.land(20);
System.out.println( "this   is   value: "+c.getstart());
System.out.println( "this   is   value: "+c.getland());}

}


请各位高手看看这个错误到底是错在哪里


------解决方案--------------------
import java.util.*;

interface fly {
void start(int a);

void land(int a);
}

class Airplane implements fly {
int meal;

int lunch;

public void start(int a) {
meal = a;

}

public void land(int b) {
lunch = b;
}

int getstart() {
return meal;
}

int getland() {
return lunch;
}
}

public class Example {

public static void main(String[] args) {
Airplane c = new Airplane();
c.start(10);
c.land(20);
System.out.println( "this is value: " + c.getstart());
System.out.println( "this is value: " + c.getland());
}

}
你接口中的方法必须也是带参数的
------解决方案--------------------
1楼说的对．