Java 中的 PrintStream clearError()方法，带示例
原文:https://www . geesforgeks . org/print stream-clear error-method-in-Java-with-examples/
Java 中 【打印流】 类的 clearError() 方法用来清除这个打印流实例的错误状态。它清除流中可能发生或没有发生的任何错误。因此，在这个方法之后，checkError()方法将总是返回 false。
语法:
protected void clearError()
参数:该方法不接受任何参数。
返回值:此方法不返回值。
下面的方法说明了 clearError()方法的工作原理:
程序 1:
// Java program to demonstrate
// PrintStream clearError() method
import java.io.*;
class GFG extends PrintStream {
// 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 Stream
String str = "GeeksForGeeks";
try {
// Create a PrintStream instance
GFG stream
= new GFG(System.out);
// Write the above string to this stream
// This will put the string in the stream
// till it is printed on the console
stream.print(str);
// Now clear the stream
// using clearError() method
stream.clearError();
System.out.println("\nHas any error occurred: "
+ stream.checkError());
}
catch (Exception e) {
System.out.println(e);
}
}
}
Output:
GeeksForGeeks
Has any error occurred: false
程序 2:
// Java program to demonstrate
// PrintStream clearError() method
import java.io.*;
class GFG extends PrintStream {
// 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 Stream
String str = "GeeksForGeeks";
try {
// Create a PrintStream instance
GFG stream
= new GFG(System.out);
// Write the char to this stream
// This will put the char in the stream
// till it is printed on the console
stream.write(65);
// Now clear the stream
// using clearError() method
stream.clearError();
System.out.println("\nHas any error occurred: "
+ stream.checkError());
}
catch (Exception e) {
System.out.println(e);
}
}
}
Output:
A
Has any error occurred: false
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