Java 练习(构造器,this练习; 测试取款程序)
作者:互联网
构造器,this练习
Girl.java
package exer1;
public class Girl {
private String name;
private int age;
public Girl() {
}
public Girl(String name, int age) {
this.name = name;
this.age = age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public void marry(Boy boy) {
System.out.println("我想嫁给" + boy.getName());
boy.marry(this);
}
/**
*
* @param girl
* @return 正数,当前对象大;负数,当前对象小;0:当前对象与形参对象想等
*/
public int compare(Girl girl) {
return this.age - girl.age;
}
}
Boy.java
package exer1;
public class Boy {
private String name;
private int age;
public Boy(String name, int age) {
this.name = name;
this.age = age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public void marry(Girl girl) {
System.out.println("我想娶" + girl.getName());
}
public void shout() {
if(this.age >= 22) {
System.out.println("你可以合法登记结婚了!");
}else {
System.out.println("先多谈谈恋爱~~");
}
}
}
BoyGirlTest.java
package exer1;
public class BoyGirlTest {
public static void main(String[] args) {
Boy boy = new Boy("罗密欧", 21);
boy.shout();
Girl girl = new Girl("朱丽叶", 18);
girl.marry(boy);
Girl girl1 = new Girl("祝英台", 19);
int compare = girl.compare(girl1);
if(compare > 0) {
System.out.println(girl.getName() + "大");
}else if(compare < 0) {
System.out.println(girl1.getName() + "大");
}else {
System.out.println("一样大");
}
}
}
运行结果:
测试取款程序
写一个测试程序。
(1)创建一个 Customer,名字叫 Jane Smith,他有一个账号为 1000,余额为2000元,年利率为1.23
(2)对Jane Smith操作。存入 100 元,再取出 960元。再取出 2000元。打印出Jane Smith 的基本信息
Account.java
package com.klvchen.exer3;
public class Account {
private int id; //账号
private double balance; //余额
private double annualInterestRate; //年利率
public Account(int id, double balance, double annualInterestRate) {
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;
}
// 在取款方法 withdraw 中,需要判断用户余额是否能够满足提款数额的要求,如果不能,应给出提示.
public void withdraw(double amount) {//取钱
if(balance < amount) {
System.out.println("余额不足,取款失败");
return;
}
balance -= amount;
System.out.println("成功取出: " + amount);
}
public void deposit(double amount) {//存钱
if(amount > 0) {
balance += amount;
System.out.println("成功存入: " + amount);
}
}
}
Customer.java
package com.klvchen.exer3;
public class Customer {
private String firstName;
private String lastName;
private Account account;
public Customer(String f, String l) {
this.firstName = f;
this.lastName = l;
}
public Account getAccount() {
return account;
}
public void setAccount(Account account) {
this.account = account;
}
public String getFirstName() {
return firstName;
}
public String getLastName() {
return lastName;
}
}
CustomerTest.java
package com.klvchen.exer3;
public class CustomerTest {
public static void main(String[] args) {
Customer cust = new Customer("Jane", "Smith");
Account acct = new Account(1000, 2000, 0.0123);
cust.setAccount(acct);
cust.getAccount().deposit(100);
cust.getAccount().withdraw(960);
cust.getAccount().withdraw(2000);
System.out.println("Customer[" + cust.getLastName() + "," + cust.getFirstName() +
"] has a account: id is " + cust.getAccount().getId() + ", annualInterestRate is "
+ cust.getAccount().getAnnualInterestRate() * 100 + "% , balance is " + cust.getAccount().getBalance());
}
}
运行结果:
标签:Java,String,age,练习,void,return,public,取款,name 来源: https://www.cnblogs.com/klvchen/p/14362452.html