Java 中的 Java.io.StringReader 类
原文:https://www . geesforgeks . org/Java-io-string reader-class-Java/
这是一个字符流类，其来源是一个字符串。 建造师:
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StringReader(String s) : Creates a new string reader.
方法:
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void close() : 关闭流并释放与其相关联的任何系统资源。一旦流被关闭，进一步的 read()、ready()、mark()或 reset()调用将引发 IOException。关闭以前关闭的流没有效果。
```java Syntax :public void close()
```
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空标记(int readAheadLimit) : 标记溪流中的当前位置。对 reset()的后续调用会将流重新定位到这一点。
java Syntax :public void mark(int readAheadLimit) throws IOException Parameters: readAheadLimit - Limit on the number of characters that may be read while still preserving the mark. Because the stream's input comes from a string, there is no actual limit, so this argument must not be negative, but is otherwise ignored. Throws: IllegalArgumentException IOException -
布尔型 markSupported() : 告诉这个流是否支持 mark()操作，它确实支持。
java Syntax :public boolean markSupported() Returns: true if and only if this stream supports the mark operation. -
int read() : 读取单个字符。
java Syntax :public int read() throws IOException Returns: The character read, or -1 if the end of the stream has been reached Throws: IOException -
int read(char[] cbuf，int off，int len) : 将字符读入数组的一部分。
java Syntax :public int read(char[] cbuf, int off, int len) throws IOException Parameters: cbuf - Destination buffer off - Offset at which to start writing characters len - Maximum number of characters to read Returns: The number of characters read, or -1 if the end of the stream has been reached Throws: IOException -
布尔就绪():告知该流是否准备好被读取。
java Syntax :public boolean ready() throws IOException Returns: True if the next read() is guaranteed not to block for input Throws: IOException -
void reset() : 将流重置为最近的标记，如果从未标记过，则重置为字符串的开头。
java Syntax :public void reset() throws IOException Throws: IOException -
long skip(long ns) : Skips the specified number of characters in the stream.. Returns the number of characters that were skipped. The ns parameter may be negative, even though the skip method of the Reader superclass throws an exception in this case. Negative values of ns cause the stream to skip backwards. Negative return values indicate a skip backwards. It is not possible to skip backwards past the beginning of the string.
如果已经读取或跳过了整个字符串，则此方法不起作用，并且始终返回 0。
java Syntax :public long skip(long ns) throws IOException Parameters: ns - The number of characters to skip Returns: The number of characters actually skipped Throws: IOException
程序:
```java //Java program demonstrating StringReader methods import java.io.IOException; import java.io.StringReader; class StringReaderDemo { public static void main(String[] args) throws IOException { StringReader str = new StringReader("GeeksforGeeks"); char c[]=new char[7];
//illustrating markSupported() if(str.markSupported()) { System.out.println("Mark method is supported"); // illustrating mark() str.mark(100); }
//illustrating skip() method str.skip(5);
//whether this stream is ready to be read. if(str.ready()) { //illustrating read() method System.out.print((char)str.read());
//illustrating read(char cff[],int off,int len) str.read(c); for (int i = 0; i <7 ; i++) { System.out.print(c[i]); } }
//illustrating reset() method str.reset();
for (int i = 0; i < 5; i++) { System.out.print((char)str.read()); }
//illustrating close() str.close(); } } ```
输出:
java Mark method is supported forGeeksGeeks本文由 尼尚·夏尔马 供稿。如果你喜欢 GeeksforGeeks 并想投稿，你也可以使用contribute.geeksforgeeks.org写一篇文章或者把你的文章邮寄到 contribute@geeksforgeeks.org。看到你的文章出现在极客博客主页上，帮助其他极客。
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