抽象类问题 小白提问

Question

java 4-3的问题 先写了这么点 编译出错 提问一下在rectangle中显示The type rectangle must implement the inherited abstract method shape.area()我不是重写了抽象方法了吗？原来的抽象的不能省去?该怎么该？public abstract class shape { public abstract int perimeter(); public abstract int area()；}public class rectangle extends shape { public int perimeter(int n, int m) {//计算周长 // TODO Auto-generated method stub int sum; sum=2*(n+m); return sum; } public int area(int n, int m) {//计算面积 // TODO Auto-generated method stub int sum; sum=n*m; return sum; }}

Answer 1

public abstract int perimeter();

public abstract int area()；

上面少了参数 (int n, int m)