What is the difference between canonical name, simple name and class name in Java Class?

Question

In Java, what is the difference between these:

Object o1 = ....
o1.getClass().getSimpleName();
o1.getClass().getName();
o1.getClass().getCanonicalName();
         


        

Answer 1

In addition to Nick Holt's observations, I ran a few cases for Array data type:

//primitive Array
int demo[] = new int[5];
Class clzz = demo.getClass();
System.out.println(clzz.getName());
System.out.println(clzz.getCanonicalName());
System.out.println(clzz.getSimpleName());       

System.out.println();


//Object Array
Integer demo[] = new Integer[5]; 
Class clzz = demo.getClass();
System.out.println(clzz.getName());
System.out.println(clzz.getCanonicalName());
System.out.println(clzz.getSimpleName());

Above code snippet prints:

[I
int[]
int[]

[Ljava.lang.Integer;
java.lang.Integer[]
Integer[]