这里新建一个UserInfo对象，用来测试lambda表达式排序，属性如下：

public class UserInfo {    private int id;    private int age;    private String name;    public UserInfo(int id, int age, String name) {        this.id = id;        this.age = age;        this.name = name;    }    public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }    public int getAge() {        return age;    }    public void setAge(int age) {        this.age = age;    }    public String getName() {        return name;    }测试    public void setName(String name) {        this.name = name;    }