集合框架11：泛型集合

视频链接：13.22 泛型集合_哔哩哔哩_bilibilihttps://www.bilibili.com/video/BV1zD4y1Q7Fw?spm_id_from=333.788.videopod.episodes&vd_source=b5775c3a4ea16a5306db9c7c1c1486b5&p=22

1.不使用泛型集合可能导致类型转换异常

类型转换异常举例：

2.泛型集合使用

public class GenericDemo01 {
    public static void main(String[] args) {
        ArrayList<String> arrayList = new ArrayList<>();
        arrayList.add("李四");
        arrayList.add("张三");
//        arrayList.add(300);
//        arrayList.add(100);
        for (String s : arrayList) {
            System.out.println(s);
        }

        ArrayList<Student> students = new ArrayList<>();
        Student s1 = new Student("张三",40);
        Student s2 = new Student("李四",41);
        Student s3 = new Student("王五",42);
        students.add(s1);
        students.add(s2);
        students.add(s3);

        Iterator<Student> iterator = students.iterator();
        while (iterator.hasNext()){
            Student s = iterator.next();
            System.out.println(s);
        }
    }
}

原文地址：https://blog.csdn.net/zhangjinajian759/article/details/143029573

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