- Experiment name
classes and objects
- Experiment purpose and requirements (knowledge points involved and required to be mastered in this computer experiment)
- Proficient in the definition of classes;
- Proficient in the creation and use of objects;
- Definition and access of class variables and static methods.
- Experimental environment (the platform and related software used in this computer practice)
Multimedia microcomputer; Windows, jdk and Eclipse.
- experimental design
- Experiment content
(1) Create a class named Rectangle to represent a rectangle. This class contains two attributes: length and width, including: completing the definition of the constructor methods of the Rectangle class, and using these constructor methods to create objects respectively;
One finds the area (getArea());
A method to find the perimeter (getPerimeter()).
Create the object and test the two methods getArea() and getPerimeter().
(2) Define a class to implement a bank account (BankAccount class), including attributes such as account number and deposit balance money, and methods including: construction, deposit, withdrawal, balance query and account number display. Create several account class objects and complete the test of four methods including deposits.
- Experimental steps
- Program 1
package shiyan5;
import java.util.Scanner;
public class shiyan5_1 {
public static void main(String[] args) {
Rectangle rect = new Rectangle();
Scanner in=new Scanner(System.in);
System.out.println("请输入长和宽：");
rect.width = in.nextInt();
rect.height = in.nextInt();
System.out.println(rect.getArea()+" "+rect.getPerimeter());
in.close();
}
}
class Rectangle{
int height;
int width;
public int getArea()
{
return this.width*this.height;
}
public int getPerimeter()
{
System.out.println("面积和周长为：");
return (this.width+this.height)*2;
}
}- Program 2
package shiyan5;
import java.util.Scanner;
public class BankAccount {
String name;
int ID;
int password;
int money;
public BankAccount(String name,int ID,int password,int money){
this.name=name;
this.ID=ID;
this.password=password;
this.money=money;
}
public void Display(){
System.out.println("账户:"+ID);
System.out.println("姓名:"+name);
System.out.println("余额:"+money);
}
public void takeMoney(){
while(true){
Scanner sc=new Scanner(System.in);
System.out.println("请输入密码进行验证！");
int pass=sc.nextInt();
if(pass==password){
System.out.println("请输入需要取款的金额！");
int withdrawals=sc.nextInt();
if(withdrawals<=money){
money=money-withdrawals;
System.out.println("账户余额"+money);
}
else{
System.out.println("当前余额不足！");
}
break;
}
else{
System.out.println("你输入的密码有误，请重新输入！");
}
sc.close();
}
}
public void saveMoney(int inmoney){
money=money+inmoney;
System.out.println("此次存款为:"+inmoney);
System.out.println("账户余额:"+money);
}
public void display(){
System.out.println("账号显示"+ID);
}
public static void main(String[] args) {
BankAccount people=new BankAccount("dsd",12345,12345,2000);
people.Display();
people.saveMoney(2000);
people.takeMoney();
people.display();
}