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51 lines
1.9 KiB
51 lines
1.9 KiB
import java.util.ArrayList;
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import java.util.List;
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public class GenericDemo {
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public static void main(String[] args) {
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// 测试 Box 泛型类
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System.out.println("===== 测试 Box 泛型类 =====");
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Box<String> stringBox = new Box<>("Hello, Generics!");
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System.out.println(stringBox);
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Box<Integer> integerBox = new Box<>(100);
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System.out.println(integerBox);
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integerBox.setContent(200);
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System.out.println("修改后：" + integerBox);
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Box<Double> doubleBox = new Box<>();
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System.out.println("空盒子：" + doubleBox);
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System.out.println("是否为空：" + doubleBox.isEmpty());
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// 测试 Pair 泛型类
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System.out.println("\n===== 测试 Pair 泛型类 =====");
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Pair<String, Integer> nameAgePair = new Pair<>("张三", 25);
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System.out.println(nameAgePair);
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System.out.println("姓名：" + nameAgePair.getKey());
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System.out.println("年龄：" + nameAgePair.getValue());
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Pair<String, String> countryCapitalPair = new Pair<>("中国", "北京");
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System.out.println(countryCapitalPair);
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// 测试泛型方法
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System.out.println("\n===== 测试泛型方法 =====");
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String[] strArray = {"Java", "Python", "C++", "JavaScript"};
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System.out.print("字符串数组：");
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GenericUtils.printArray(strArray);
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Integer[] intArray = {1, 2, 3, 4, 5};
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System.out.print("原始数组：");
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GenericUtils.printArray(intArray);
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GenericUtils.swap(intArray, 0, 4);
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System.out.print("交换后数组：");
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GenericUtils.printArray(intArray);
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List<Double> doubleList = new ArrayList<>();
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doubleList.add(1.5);
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doubleList.add(2.5);
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doubleList.add(3.5);
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System.out.println("列表元素数量：" + GenericUtils.countListElements(doubleList));
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}
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}
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