Java StringWriter close()方法及示例
Java中StringWriter类的close()方法用于关闭写入器。关闭一个写入器会删除其中的任何值或与之相关的任何资源。StringWriter实例一旦关闭就不会再工作。另外,一旦关闭的StringWriter实例不能再被关闭。
语法。
public void close()
参数。该方法不接受任何参数。
返回值。这个方法不返回任何值。它只是关闭了流。
下面的程序说明了close()方法的工作原理。
程序1:
// Java program to demonstrate
// StringWriter close() method
import java.io.*;
class GFG {
public static void main(String[] args)
{
// The string to be written in the Stream
String str = "GeeksForGeeks";
try {
// Create a StringWriter instance
StringWriter writer
= new StringWriter();
// Write the above string to this writer
// This will put the string in the writer
// till it is printed on the console
writer.write(str);
System.out.println(writer.toString());
// Now close the writer
// using close() method
writer.close();
}
catch (Exception e) {
System.out.println(e);
}
}
}
输出:
GeeksForGeeks
程序2。
// Java program to demonstrate
// StringWriter close() method
import java.io.*;
class GFG {
public static void main(String[] args)
{
try {
// Create a StringWriter instance
StringWriter writer
= new StringWriter();
// Write the char to this writer
// This will put the char in the writer
// till it is printed on the console
writer.write(65);
System.out.println(writer.toString());
// Now close the writer
// using close() method
writer.close();
}
catch (Exception e) {
System.out.println(e);
}
}
}
输出:
A