为什么我看不到Java中的Unicode字符

Question

I am learning java and I found out that in java char ranges from 0-65536 and java uses Unicode to represent characters. So, I run the following code to see what all the characters are:

class A{
    public static void main(String args[]){
        char x=0;
        for(int i=0;i<65536;i++){
            x++;
            System.out.println(i + "th character is: " + x);
        }
    }
}

what I found is :-

1. First 126 characters are same as ASCII characters.

2. After 126th character it is just showing '?' mark.

Output:-

...
127th character is: ?
128th character is: ?
129th character is: ?
130th character is: ?
131th character is: ?
132th character is: ?
133th character is: ?
...
65534th character is: ?

My question is why it is showing '?' mark instead of the Unicode characters.

Answer 1

Check your file encoding with the following line and see what comes up. If not 'UTF-8' then set it correctly. Still you wont see all of the char printed. So you need to see which one you want to set the file encoding accordingly.

System.out.println(System.getProperty("file.encoding"));
System.setProperty("file.encoding","UTF-8");