- 首先這個(gè)函數(shù)或?qū)傩远际怯脕?lái)獲得一個(gè)類型的Class對(duì)象。每一個(gè)類型在java虛擬機(jī)中都對(duì)應(yīng)一個(gè)Class對(duì)象，該對(duì)象用于java虛擬機(jī)加載一個(gè)該類型的對(duì)象到內(nèi)存中。
- 其次getClass都是用于一個(gè)Custom object的，.class用于一個(gè)類型(系統(tǒng)封裝或者用戶自定義類型)，比如People類型，而forName 是Class類型的一個(gè)靜態(tài)函數(shù)，用于獲得一個(gè)類型的Class對(duì)象。
- getClass返回的Class對(duì)象，是在運(yùn)行時(shí)確定的，而另外兩個(gè)都是在編譯的時(shí)候確定的。
假如我們有兩個(gè)類型People和Student，其中student繼承自People。如果執(zhí)行下面的代碼：
People people = new Student();
try{
System.out.println(Class.forName("People") == People.class);
System.out.println(Class.forName("People") == people.getClass());
System.out.println(people.getClass() == People.class);
System.out.println(Class.forName("People"));//People
System.out.println(people.getClass());//Student
System.out.println(People.class);//People
}catch(Exception e)
{
e.printStackTrace();
}
Student student = new Student();
try{
System.out.println(Class.forName("Student") == Student.class);
System.out.println(Class.forName("Student") == student.getClass());
System.out.println(student.getClass() == Student.class);
System.out.println(Class.forName("Student"));//Student
System.out.println(student.getClass());//Student
System.out.println(Student.class);//Student
}catch(Exception e)
{
e.printStackTrace();
}
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