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)