javase：账户继承

public class ExtendsTest {
    public static void main(String[] args) {
        CreditAccount c = new CreditAccount();
        c.setAccId("382039");
        c.setBalance(123.4);
        c.setCredit(765);
        System.out.println(c.getBalance() );
        System.out.println(c.getAccId() );
        System.out.println(c.getCredit() );

    }
}

class Accounts {
    private String accId;
    private double balance;

    public Accounts() {
    }

    public Accounts(String accId, double balance) {
        this.accId = accId;
        this.balance = balance;
    }

    public String getAccId() {
        return accId;
    }

    public void setAccId(String accId) {
        this.accId = accId;
    }

    public double getBalance() {
        return balance;
    }

    public void setBalance(double balance) {
        this.balance = balance;
    }
}

class CreditAccount extends Accounts {
    private double credit;

    public CreditAccount() {
    }

    public double getCredit() {
        return credit;
    }

    public void setCredit(double credit) {
        this.credit = credit;
    }
}