Java-api

定义一个学生类：

public class Student {
    String name;
    int age;
    
    public Student(String name,int age) {
        this.name = name;
        this.age = age;
    }
    
    public Student() {
        
    }

    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;
    }

    @Override
    public String toString() {
        return "Student [name=" + name + ", age=" + age + "]";
    }
    
    
    
}

测试类：

public class Test {

    public static void main(String[] args) {
        

        Student stu = new Student("张三",18);
        Student stu1 = new Student("李四",19);
        Student stu2 = new Student("王五",17);
        
        
        List<Student> list = new ArrayList<>();
        
        list.add(stu);
        list.add(stu1);
        list.add(stu2);
        
        Collections.sort(list,(o1,o2)->{
            return o1.getAge()-o2.getAge();
        });
        
        System.out.println(list);
        
        for (int i = 0; i < list.size(); i++) {
            System.out.println(list.get(i));
        }

        System.out.println("--------------------");
        
        for (Student student : list) {
            System.out.println(student);
        }
        System.out.println("********************");
        
        
        Iterator<Student> lter = list.iterator();
        while (lter.hasNext()) {
            System.out.println(lter.next());
            
        }
    }

}