java/w3/BankAccount.java

public  class BankAccount {
    private String accountNumber;
    private String ownerName;
    private double balance;

    public BankAccount(String accountNumber,String ownerName){
        this.accountNumber=accountNumber;
        this.ownerName=ownerName;
        this.balance=0.0;
    }

    public String getAccountNumber(){
        return accountNumber;
    }

    public void setOwnerName(String ownerName){
        this.ownerName=ownerName;
    }

    public String getOwnerName(){
        return ownerName;
    }

    public double getBalance(){
        return balance;
    }

    public void deposit(double amount){
        if (amount>0){
            this.balance+=amount;
            System.out.println("存款成功！存入金额："+amount+"元，当前余额："+this.balance+"元");
        }else {
            System.out.println("存款失败！存款金额必须大于0");
        }
    }

    public void withdraw(double amount){
        if (amount<=0){
            System.out.println("取款失败！取款金额必须大于0");
        } else if (amount>this.balance){
            System.out.println("取款失败！余额不足，当前余额："+this.balance+"元");
        } else {
            this.balance-=amount;
            System.out.println("取款成功！取出金额："+amount+"元，当前余额："+this.balance+"元");
        }
    }
}