Java 使用缓冲读取器读取 int
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/32715459/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Reading an int using Buffered Reader
提问by jellyFish
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
System.out.println("please enter the size of array");
size = br.read();
sarray = new int[size];
for (int i = 0; i < size; i++) {
sarray[i] = i;
}
System.out.println(sarray.length);
When I tried to print the length of the array, it is showing as "51" even though i gave the size as "3".
当我尝试打印数组的长度时，即使我将大小指定为“3”，它也显示为“51”。
采纳答案by Rehman
Use readLine() method instead of read() method .
使用 readLine() 方法而不是 read() 方法。
int size = Integer.parseInt(br.readLine());
read() method doesnt return the exact int value of input.
read() 方法不返回输入的确切 int 值。
public int read() throws IOException Reads a single character. Overrides: read in class Reader Returns: The character read, as an integer in the range 0 to 65535 (0x00-0xffff), or -1 if the end of the stream has been reached Throws: IOException - If an I/O error occurse
public int read() throws IOException 读取单个字符。覆盖：读取类 Reader 返回：读取的字符，为 0 到 65535 (0x00-0xffff) 范围内的整数，如果已到达流的末尾，则为 -1 抛出：IOException - 如果发生 I/O 错误
Ref : http://docs.oracle.com/javase/7/docs/api/java/io/BufferedReader.html#read()
参考：http: //docs.oracle.com/javase/7/docs/api/java/io/BufferedReader.html#read()
回答by Tunaki
BufferedReader.read()reads a single character and returns it as an integer (i.e. returns the ASCII code of the character).
BufferedReader.read()读取单个字符并将其作为整数返回（即返回字符的 ASCII 码）。
When you input 3to your BufferedReader, read()will read it as a character, i.e. as '3', which corresponds to the ASCII code 51.
当你输入3你的BufferedReader,read()会将它读为一个字符，即 as '3'，它对应于 ASCII 码 51。
You can verify this by executing the following code:
您可以通过执行以下代码来验证这一点：
System.out.println((int) '3'); // prints 51
