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Tuần 8: Giao diện (interface)
[codes=java]import java.util.*;import java.io.*; interface HINH{ public final double PI=3.14; public void Nhap(); public void Xuat(); public float Dientich(); } class HINHVUONG implements HINH{ private float canh; public void Nhap() { Scanner x=new Scanner(System.in); System.out.print("NHap canh cho hinh vuong: "); canh=x.nextFloat(); } public void Xuat() { System.out.println("Hinh vuong co canh vua nhap la:" +canh); } public float Dientich() { return canh*canh; }} class HCN implements HINH{ private float dai; private float rong; public void Nhap() { Scanner x=new Scanner(System.in); System.out.print("Nhap chieu dai…