throws demo print char 字符数 lang java 字节数组
内存流(数组流):
把数据先临时存在数组中,待会再从数组中获取出来。
1. 字节内存流:ByteArrayInputStream/ByteArrayOutputStream
2. 字符内存流:CharArrayInputStream/CharArrayOutputStream
3. 字符串流:StringReader/StringWriter(把数据存放在数组中)
字节内存流:
- public class ByteArrayDemo {
- public static voidmain(java.lang.String[] args)throws Exception {
- //字节数组输出流:程序到内存ByteArrayOutputStream bos =new ByteArrayOutputStream();
- bos.write("ABCD".getBytes());
- //使用存储的临时数据
- byte[] buffer = bos.toByteArray();
- //字节数组输入流:内存到程序ByteArrayInputStream bis =new ByteArrayInputStream(buffer);
- byte[] bys =new byte[1024];
- intlen = -1;
- while((len = bis.read(bys)) != -1) {
- System.out.print(newjava.lang.String(bys,0,len));
- }
- bos.close();
- bis.close();
- }
- }
字符数组流:与字节操作大致相同。
字符串流:
- 1 public class StringWriterReaderDemo {
- 2 public static void main(String[] args) throws IOException {
- 3 //字符串的输出流
- 4 StringWriter stringWriter = new StringWriter();
- 5 stringWriter.write("你多大了?");
- 6 stringWriter.write("21岁!");
- 7 8 //字符串的输入流
- 9 StringReader stringReader = new StringReader(stringWriter.toString());
- 10 char[] buffer = new char[1024];
- 11 int len = -1;
- 12
- while ((len = stringReader.read(buffer)) != -1) {
- 13 System.out.println(new String(buffer, 0, len));
- 14
- }
- 15
- }
- 16
- }
Java 核心类库 - IO - 字节数组流 / 内存流
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