java 4-3的問題 先寫了這么點(diǎn) 編譯出錯(cuò) 提問一下在rectangle中顯示The type rectangle must implement the inherited abstract method shape.area()我不是重寫了抽象方法了嗎？原來的抽象的不能省去?該怎么該？public abstract class shape { public abstract int perimeter(); public abstract int area()；}public class rectangle extends shape { public int perimeter(int n, int m) {//計(jì)算周長(zhǎng) // TODO Auto-generated method stub int sum; sum=2*(n+m); return sum; } public int area(int n, int m) {//計(jì)算面積 // TODO Auto-generated method stub int sum; sum=n*m; return sum; }}
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qq_青棗工作室_0
TA貢獻(xiàn)446條經(jīng)驗(yàn) 獲得超754個(gè)贊
public abstract int perimeter();
public abstract int area()；
上面少了參數(shù) (int n, int m)
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Xeon0312謝謝 弄明白了
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