Java之实验（继承&super）

r囧r小猫 2022-11-25 15:27 234阅读 0赞

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NjYyNjgzMw_size_16_color_FFFFFF_t_70]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NjYyNjgzMw_size_16_color_FFFFFF_t_70 1]  
Account类

package com.atguigu.exer1;
    
    public class Account { 
    	private int id;
    	private double balance;
    	private double annualInterestRate;//年利率
    	
    	public Account() { 
    		super();
    	}
    	public Account(int id, double balance, double annualInterestRate) { 
    		super();
    		this.id = id;
    		this.balance = balance;
    		this.annualInterestRate = annualInterestRate;
    	}
    	
    	public int getId() { 
    		return id;
    	}
    	public void setId(int id) { 
    		this.id = id;
    	}
    	public double getBalance() { 
    		return balance;
    	}
    	public void setBalance(double balance) { 
    		this.balance = balance;
    	}
    	public double getAnnualInterestRate() { 
    		return annualInterestRate;
    	}
    	public void setAnnualInterestRate(double annualInterestRate) { 
    		this.annualInterestRate = annualInterestRate;
    	}
    	//月利率
    	public double getMonthlyIneterest() { 
    		return annualInterestRate / 12;
    	}
    	//取钱
    	public void withdraw(double amount) { 
    		if(balance < amount) { 
    			System.out.println("余额不足!");
    		}else { 
    			balance -= amount;
    		}
    	}
    	//存钱
    	public void deposit(double amount) { 
    		balance += amount;
    	}
    }

CheckAccount类

package com.atguigu.exer1;
    
    public class CheckAccount extends Account{ 
    	private double overdraft;//可透支额度
    	
    	public CheckAccount() { 
    		super();
    	}
    
    	public CheckAccount(int id,double balance,double annualInterestRate,double overdraft) { 
    		super(id,balance,annualInterestRate);
    		this.overdraft = overdraft;
    	}
    	public void withdraw(double amount) { 
    		if(getBalance() >= amount) { 
    			super.withdraw(amount);
    			System.out.println("取款成功");
    			System.out.println("目前账户余额有" + getBalance());
    			System.out.println("您的透支额度还剩：" + overdraft);
    		}else if(amount < (overdraft + getBalance())) { 
    			overdraft = (overdraft + getBalance() - amount);
    			setBalance(0);
    			System.out.println("您的透支额度还剩：" + overdraft);
    			System.out.println("目前账户余额为" + getBalance());
    			setBalance(0);
    		}else { 
    			System.out.println("您的透支额度已限额");
    			System.out.println("您目前的透支额度还有" + overdraft);
    			System.out.println("目前账户余额有" + getBalance());
    			System.out.println("您目前最多能取走的金额为" + (overdraft + getBalance()));
    		}
    	}
    }

Accout和CheackAccount的测试类

package com.atguigu.exer1;
    
    public class AccountTest { 
    	public static void main(String[] args) { 
    		Account acc = new Account(1122, 20000, 0.045);
    		acc.withdraw(30000);
    		System.out.println("您的账户余额为" + acc.getBalance());
    		acc.deposit(3000);
    		acc.withdraw(2500);
    		System.out.println("\n您的账户余额为" + acc.getBalance());
    		System.out.println("月利率为" + acc.getMonthlyIneterest() * 100 + "%");
    		
    		System.out.println("*************************");
    		CheckAccount ca = new CheckAccount(1122, 20000, 0.045, 5000);
    		ca.withdraw(5000);
    		System.out.println("\n");
    		ca.withdraw(18000);
    		System.out.println("\n");
    		ca.withdraw(3000);
    	}
    }

调试结果  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NjYyNjgzMw_size_16_color_FFFFFF_t_70 2]

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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NjYyNjgzMw_size_16_color_FFFFFF_t_70 2]: /images/20221124/05d8afc336db495aacdea8db5c480264.png