Java 中的 PrintWriter checkError()方法，带示例
原文:https://www . geesforgeks . org/print writer-checker err-method-in-Java-with-examples/
Java 中类的 checkError() 方法用于检查这个 PrintWriter 实例的错误状态。此方法刷新流以检查错误状态。它返回一个布尔值，告知流是否遇到任何错误。
语法:
public boolean checkError()
参数:该方法不接受任何参数。
返回值:该方法返回一个布尔值，说明流是否遇到任何错误。如果遇到任何错误，它将返回 true。否则返回假。
下面的方法说明了 checkError()方法的工作原理:
程序 1:
// Java program to demonstrate
// PrintWriter checkError() method
import java.io.*;
class GFG {
public static void main(String[] args)
{
// The string to be written in the Writer
String str = "GeeksForGeeks";
try {
// Create a PrintWriter instance
PrintWriter writer
= new PrintWriter(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);
// Now check the stream
// using checkError() method
System.out.println("\nHas any error occurred: "
+ writer.checkError());
}
catch (Exception e) {
System.out.println(e);
}
}
}
Output:
GeeksForGeeks
Has any error occurred: false
程序 2:
// Java program to demonstrate
// PrintWriter checkError() method
import java.io.*;
class GFG {
public static void main(String[] args)
{
try {
// Create a PrintWriter instance
PrintWriter writer
= new PrintWriter(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);
// Now check the stream
// using checkError() method
System.out.println("\nHas any error occurred: "
+ writer.checkError());
}
catch (Exception e) {
System.out.println(e);
}
}
}
Output:
A
Has any error occurred: false
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