60 lines
1.3 KiB
Java
60 lines
1.3 KiB
Java
package chapter6;
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// 定义支付接口（泛型接口）
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interface Payment<T> {
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boolean pay(T amount); // 支付方法
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T getBalance(); // 获取余额
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}
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// 方式一：明确类型的接口实现 - 支付宝支付
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class AliPay implements Payment<Double> {
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private Double balance = 1000.0;
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@Override
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public boolean pay(Double amount) {
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if (balance >= amount) {
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balance -= amount;
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System.out.println("支付成功：" + amount + "元");
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return true;
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}
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return false;
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}
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@Override
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public Double getBalance() {
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return balance;
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}
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}
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// 方式二：泛型类型的接口实现 - 校园卡支付
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class CampusCard<T> implements Payment<T> {
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private T balance;
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public CampusCard(T balance) {
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this.balance = balance;
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}
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@Override
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public boolean pay(T amount) {
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System.out.println("支付积分：" + amount);
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return true;
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}
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@Override
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public T getBalance() {
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return balance;
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}
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}
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public class Example25 {
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public static void main(String[] args) {
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// 测试支付宝支付
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AliPay aliPay = new AliPay();
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aliPay.pay(100.0);
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// 测试校园卡支付
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CampusCard<Integer> campusCard = new CampusCard<>(500);
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campusCard.pay(100);
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}
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}
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