Java CharArrayReader close()方法及示例
Java中CharArrayReader类的close()方法用于关闭流并释放在流中忙碌的资源,如果有的话。这个方法有以下结果。
- 如果流是开放的,它将关闭流,释放资源。
- 如果流已经被关闭,它将没有任何影响。
- 如果在关闭后对流进行任何读取或其他类似的操作,它将引发IOException。
语法。
public abstract void close()
参数。这个方法不接受任何参数
返回值。此方法不返回任何值。
异常。如果在输入输出时发生一些错误,该方法会抛出IOException。
下面的方法说明了close()方法的工作。
程序 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.
计划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
参考资料: https://docs.oracle.com/javase/9/docs/api/java/io/CharArrayReader.html#close-