Java中CharArrayReader类的close()方法用于关闭流并释放流中繁忙的资源(如果有)。此方法具有以下结果:
- 如果流是打开的,则关闭流以释放资源
- 如果流已经关闭,则将无效。
- 如果对流执行任何读取或其他类似操作,则在关闭后,将引发IOException
用法:
public abstract void close()
参数:此方法不接受任何参数
返回值:此方法不返回任何值。
异常:如果输入输出时发生某些错误,则此方法将引发IOException。
下面的方法说明了close()方法的用法方式:
示例1:
// Java program to demonstrate
// CharArrayReader close() method
import java.io.*;
import java.util.*;
class GFG {
public static void main(String[] args)
{
try {
char[] str = { 'G', 'e', 'e', 'k', 's',
'F', 'o', 'r',
'G', 'e', 'e', 'k', 's' };
// Create a CharArrayReader instance
CharArrayReader reader
= new CharArrayReader(str);
// Get the character
// to be read from the stream
int ch;
// Read the first 5 characters
// to this reader using read() method
// This will put the str in the stream
// till it is read by the reader
for (int i = 0; i < 5; i++) {
ch = reader.read();
System.out.println("\nInteger value "
+ "of character read: "
+ ch);
System.out.println("Actual "
+ "character read: "
+ (char)ch);
}
// Close the stream using close()
reader.close();
System.out.println("Stream Closed.");
}
catch (Exception e) {
System.out.println(e);
}
}
}
输出:
Integer value of character read: 71 Actual character read: G Integer value of character read: 101 Actual character read: e Integer value of character read: 101 Actual character read: e Integer value of character read: 107 Actual character read: k Integer value of character read: 115 Actual character read: s Stream Closed.
示例2:
// Java program to demonstrate
// CharArrayReader close() method
import java.io.*;
import java.util.*;
class GFG {
public static void main(String[] args)
{
try {
char[] str = { 'G', 'e', 'e', 'k', 's' };
// Create a CharArrayReader instance
CharArrayReader reader
= new CharArrayReader(str);
// Close the stream using close()
reader.close();
System.out.println("Stream Closed.");
// Check if the CharArrayReader is
// ready to be read using ready()
System.out.println("Is CharArrayReader ready "
+ "to be read"
+ reader.ready());
}
catch (Exception e) {
System.out.println(e);
}
}
}
输出:
Stream Closed. java.io.IOException: Stream closed
参考: https://docs.oracle.com/javase/9/docs/api/java/io/CharArrayReader.html#close–
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