java - Java 中的自动装箱

Question

下面的表达式是如何求值的？

学生类(class):

public class Student
{
    private Integer id;
    // few fields here

    public Integer getId()
    {
        return id;
    }

    public void setId(Integer id)
    {
        this.id=id;
    }

    //setters and getters
}

并且在某些方法中:

{
    int studentId;

    // few lines here

    if(studentId==student.getId())  // **1. what about auto-unboxing here? Would it compare correctly? I am not sure.**
    {
        //some operation here
    }
}

Answer 1

是的，这将起作用它等同于

studentId==student.getId().intValue()  

只要 student.id 不是 null。