Detailed explanation of the differences between Character and char methods

Today I suddenly need to use a Character. When using HashMap, I define:

HashMap< Integer, Character> map=new HashMap<Integer,Character>(); This can be used, but when defined as:

HashMap<Integer, char> map=new HashMap<Integer,char>(); In this case, problems will occur, so After checking the difference, I learned that when I was learning Java, I learned the English version, but I didn't learn it well, so now I can only make up for it slowly.

Character is a wrapper class for char, just like Integer and int, and Long and long.

Character is a wrapper class for char. Note that it is a class that provides many methods.

Packaging classes and basic types can be automatically converted. This is a new feature of jdk1.5 (5.0), called automatic sealing and automatic unblocking

That is:

## Example 1:

char ch='a';

Character ch1=ch;//Automatic sealing

Character c=new Character(a);

##char c1=c;//Automatically unblock

##Example 2:

int t=10;

##Integer t1=t;//Automatic sealing

Integer t=new Integer(10);int t1=t//Automatically unblock


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