Question

要求编写一个java程序，输入学生信息，并能保存与显示学生信息。

编写帐簿类AccountBook类。类中有三个属性：accountName(String类型)、income(double类型)和outcome(double类型)。定义通过收入和支出自动计算余额的方法compute。再编写测试类，在测试类中用AccoutnBook类创建一个帐簿对象，设置名称是“Zhangsan”，收入30.0，支出10.0，并将帐户名称“Zhangsan”，该帐户收入额和支出额及该账户的余额输出到控制台。

【样例输出】

Answer 1

追答

代码我发不出去

import java.io.*;

public class Main {
public static void main(String[] args) throws Exception{

AccountBook ab = new AccountBook("Zhangsan", 30, 10);
System.out.println(ab);

//保存数据
AccountBook abt = new AccountBook("Lisi", 50, 30);
ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("D:\\Hlddz\\Computer\\Desktop\\test.dj"));
oos.writeObject(abt);
oos.flush();
oos.close();

//读取数据
ObjectInputStream ois = new ObjectInputStream(new FileInputStream("D:\\Hlddz\\Computer\\Desktop\\test.dj"));
AccountBook ab2 = (AccountBook)ois.readObject();
System.out.println(ab2);
}
}

这是测试类

import java.io.*;

public class AccountBook implements Serializable{
private String accountName;
private double income;
private double outcome;

public AccountBook(String name, double inCome, double outCome) {
this.accountName = name;
this.income = inCome;
this.outcome = outCome;
}

public synchronized double getAllIncome() {
return this.income;
}
public synchronized double getAllOutcome() {
return this.outcome;
}

public synchronized void addOutcome(double setVal) {
this.outcome += setVal;
}
public synchronized void setIncome(double setVal) {
this.income += setVal;
}

public synchronized double getBalance() {
return income - outcome;
}

public void setAccountName(String name) {
accountName = name;
}
public String getName() {
return accountName;
}

public String toString() {
//@Override
return
"Account: " + accountName +
" Balance: " + (income - outcome) +
" TotalRevenue: " + income +
" TotalExpenses: " + outcome;
}
}

这个是AccountBook类