面试官：Class类中各个方法有什么区别？
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2020-12-20
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面试官：面试官：Class类中各个方法有什么区别？类中各个方法有什么区别？
Class类中有很多方法，今天我们就来介绍几个在面试中经常被问到并且非常容易混淆的方法。
1.getFields()和和getDeclaredFields()的区别的区别
Class类中getFields()和getDeclaredFields()都是用来获取成员变量的方法，那么它们之间有什么区别呢？
我们首先使用代码来进行演示，然后我们再根据运行结果进行分析。
1.1定义一个实体类定义一个实体类Person
public class Person {
public String name; //最大范围public
protected int age; //受保护类型
int height; //默认的访问权限
private String adress; //私有类型
public Person() {
}
protected Person(String name, int age) {
this.name = name;
this.age = age;
}
Person(String name, int age, int height) {
this.name = name;
this.age = age;
this.height = height;
}
private Person(String name, int age, int height, String adress) {
this.name = name;
this.age = age;
this.height = height;
this.adress = adress;
}
public void eat(){
System.out.println("eat...");
}
protected void drink(){
System.out.println("drink...");
}
void play(){
System.out.println("play...");
}
private void happy(){
System.out.println("happy...");
}
}
1.2再定义一个实体类再定义一个实体类Student继承继承Person
public class Student extends Person{
public String school; //最大范围public
protected String grade; //受保护类型
String classes; //默认的访问权限
private String score; //私有类型
public Student() {
}
protected Student(String school) {
this.school = school;
}
Student(String school, String score) {
this.school = school;
this.score = score;
}
private Student(String school, String grade, String classes, String score) {
this.school = school;
this.grade = grade;
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