Java 中 PrintWriter setError()方法，带示例
原文:https://www . geesforgeks . org/print writer-set error-method-in-Java-with-examples/
Java 中类的 setError() 方法用来设置这个 PrintWriter 实例的错误状态。此方法用作指示符，指示流中发生了错误。它是受保护的，因此需要通过派生 PrintWriter 类来使用它来实现。
语法:
protected void setError()
参数:该方法不接受任何参数。
返回值:这个方法不返回任何东西。
下面的方法说明了 setError()方法的工作原理:
程序 1:
// Java program to demonstrate
// PrintWriter setError() method
import java.io.*;
// extending the PrintWriter Class
class GFG extends PrintWriter {
// Defining the protected constructor
public GFG(OutputStream out)
{
super(System.out);
}
// Driver Code
public static void main(String[] args)
{
// The string to be written in the Writer
String str = "GeeksForGeeks";
try {
// Create a GFG instance
GFG writer
= new GFG(System.out);
// Write the above string to this writer
// This will put the string in the stream
// till it is printed on the console
writer.write(str);
writer.flush();
// Use the protected setError() method
writer.setError();
}
catch (Exception e) {
System.out.println(e);
}
}
}
Output:
GeeksForGeeks
程序 2:
// Java program to demonstrate
// PrintWriter setError() method
import java.io.*;
// extending the PrintWriter Class
class GFG extends PrintWriter {
// Defining the protected constructor
public GFG(OutputStream out)
{
super(System.out);
}
// Driver Code
public static void main(String[] args)
{
try {
// Create a GFG instance
GFG writer
= new GFG(System.out);
// Write the char to this writer
// This will put the char in the stream
// till it is printed on the console
writer.write(65);
writer.flush();
// Use the protected setError() method
writer.setError();
}
catch (Exception e) {
System.out.println(e);
}
}
}
Output:
A
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