java - 打印一些其他字符

Question

import java.io.*;
class Test{
    public static void main(String args[])throws IOException{
        char a[]=new char[4];       
        DataInputStream in=new DataInputStream(System.in);
        for(int i=0;i<4;i++)
            a[i]=in.readChar();
        System.out.println("Characters are : ");
        for(int i=0;i<4;i++)
            System.out.println(a[i]);
    }   
}

输出:

java Test
a
s
d
f
Characters are : 
愊
猊
搊
昊

这里我读取了字符 a、s、d 和 f..但它打印了一些其他字符..

Answer 1

输入字符通过以下逻辑进行操作:

(char)((a << 8) | (b & 0xff))

参见readChar文档:

public char readChar() throws IOException

Reads an input char and returns the char value. A Unicode char is made up of two bytes. Let a be the firstbyte read and b be the second byte. The value returned is: (char)((a<< 8) | (b & 0xff))

This method is suitable for reading byteswritten by the writeChar method of interface DataOutput.