Java类的操作

银行账户类

package com.github.Mrtiang;

public class Account {
	/**
	 * 创建账户属性
	 */
	private int id;
	private double balance;
	private double annualInterestRate;
	
	/**
	 * 定义私密属性的访问方法
	 * set/get方法
	 */
	
	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;
	}
	/**
	 * 定以月利率其他方法
	 * 
	 * 年利率、月利率和日利率转换公式：      
	 * 月利率=年利率/12，年利率=月利率*12。       
	 * 年利率按本金的百分之几（%）表示，月利率按千分之几（‰）表示，
	 * 
	 */
	public double getMonthlyInterest(){
		
		double monthlyInterest=annualInterestRate/12;
		return monthlyInterest;
		
	}
	/**
	 * 定义存取款方法
	 */
	public void withdraw(double amount){
		
		this.balance=balance+amount;
		System.out.println("存款成功，目前余额为"+balance);
		
	}
	public void deposit(double amount){
		if(balance>amount||this.balance==amount){
			this.balance=balance-amount;
			System.out.println("取款成功，目前余额为"+balance+"\n"+"目前月利率为"+getMonthlyInterest()+"\n");
		}else{
			System.out.println("余额不足，无法取款");
			System.out.println("您目前余额为："+balance+"\n");
		}
		
	}
}

账户测试

package com.github.Mrtiang;

public class AccountTest {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Account man=new Account();
		/**
		 * 设置对象参数，给属性赋值
		 */
		man.setId(1122);
		
		man.setBalance(20000);
		
		
		man.setAnnualInterestRate(0.045);
		
		/**
		 * 调用取款方法
		 * 输出信息
		 */
		man.deposit(30000);
		
		man.deposit(2500);
		/**
		 * 调用存款方法
		 * 输出信息
		 */
		man.withdraw(3000);
	}

}