Bài Tập JAVA số 2

1. Quản lý bán hàng dùng kế thừa trong java

package baitap_coban;

import java.util.Scanner;

class Laptop{

public String tenhang,mahang;

public int giahang,soluong, giamgia;

public static float Tinhtien(int giahang, int soluong) {

return (float) giahang*soluong;

}

public static float Tinhtien(int giahang, int soluong, int giamgia){

int giagiam = (giahang*soluong*giamgia)/100;

return (float) (giahang*soluong)-giagiam;

}

private Scanner in;

//-----------------------------------------------------------//

public void Nhap(){

in = new Scanner(System.in);

System.out.print("Ma Hang: ");

mahang = in.nextLine();

System.out.print("Ten Hang: ");

tenhang = in.nextLine();

System.out.print("So Luong: ");

soluong = in.nextInt();

System.out.print("Gia Hang: ");

giahang = in.nextInt();

System.out.print("Giam Gia: ");

giamgia = in.nextInt();

System.out.println();

}

public void Show(){

System.out.println("Ma Hang: "+mahang);

System.out.println("Ten Hang: "+tenhang);

System.out.println("Gia Hang: "+giahang);

System.out.println("So Luong: "+soluong);

System.out.println("Tong tien: "+this.Tinhtien(giahang, soluong));

System.out.println();

}

}

//------------------------------------------------------------//

class Dell extends Laptop{

public static float Tinhtien(int giahang, int soluong, int giamgia) {

int giagiam = (giahang*soluong*(giamgia+10))/100;

return (float) (giahang*soluong)-giagiam;

}

}

public class QuanLyBanHang {

public static void main(String[] args) {

Laptop a = new Laptop();

a.Nhap();

a.Show();

Dell b = new Dell();

b.Nhap();

b.Show();

}

}

2. Tính điểm môn học dùng kế thừa trong java

package baitap_coban;

import java.util.Scanner; 

import java.io.*; 

class SVien { 

    String TenSV; 

    int MaSV; 

    void setSV(String Ten, int Ma){ 

    TenSV=Ten; 

    MaSV=Ma; 

    } 

    public void viewSV(){ 

        System.out.println ("Ten Sinh Vien: " +TenSV); 

        System.out.println ("Ma Sinh Vien: " +MaSV); 

    }  

} 

class SinhvienCNTT extends SVien { 

    float dtoan,dtin; 

    public void setSVCNTT(String TenSV,int MaSV, float dtoan, float dtin){ 

    super.setSV(TenSV,MaSV); 

    this.dtoan=dtoan; 

    this.dtin=dtin; 

    } 

    public void viewSVCNTT(){ 

        super.viewSV(); 

        System.out.println ("Diem Toan: " +this.dtoan); 

        System.out.println ("Diem Tin: " +this.dtin); 

        System.out.println ("Tong Diem: "+this.tongdiem()); 

    }  

    public float tongdiem(){ 

        return dtoan+dtin;     

    }

public static void main (String[] args) { 

    String TenSV; 

    int MaSV; 

    float dtoan,dtin; 

    Scanner input = new Scanner(System.in); 

    SinhvienCNTT a[] = new SinhvienCNTT[50]; 

    System.out.print ("Nhap so sinh vien n= "); 

    int n = input.nextInt(); 

        for(int i=0;i<n;i++){ 

        a[i]=new SinhvienCNTT(); 

        System.out.println ("Nhap a["+i+"]: "); 

        System.out.println ("Ten SV: "); 

        input = new Scanner(System.in); 

        TenSV = input.nextLine(); 

        System.out.println ("Ma SV: "); 

        MaSV = input.nextInt(); 

        System.out.println ("Diem toan: "); 

        dtoan = input.nextFloat(); 

        System.out.println ("Diem tin; "); 

        dtin = input.nextFloat(); 

        a[i].setSVCNTT(TenSV,MaSV,dtoan,dtin); 

        }

    System.out.println ("Sinh Vien Co Tong Diem > 10 la: "); 

    for (int i=0; i< n; i++){ 

        if(a[i].tongdiem()>10){

        a[i].viewSVCNTT(); 

        } 

    } 

    System.out.println ("Sinh Vien Co Tong Diem < 5 la: "); 

     

    for (int i = 0; i< n; i++){ 

    if(a[i].tongdiem()<5){ 

            a[i].viewSVCNTT(); 

        } 

    } 

}     

}

3. Số hoàn hảo trong java

 

package baitap_coban;

import java.util.Scanner;

public class So_hoan_hao {

public static void main(String[]args) {

int i, j, n;

Scanner nhap = new Scanner(System.in);

System.out.print("nhap vao n: ");

n = nhap.nextInt();

System.out.println("Day so hoan hao la:");

for (i = 1; i <= n; i++) {

int tong = 1;

for (j = 2; j <= i / 2; j++) {

if (i % j == 0)

tong = tong + j;

}

if (tong == i)

System.out.print(" " + i );

}

}

}