用示例在 Java 中打印 Stream checkError()方法
原文:https://www . geesforgeks . org/print stream-checker err-method-in-Java-with-examples/
Java 中 【打印流】 类的 checkError() 方法用于检查这个打印流实例的错误状态。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
// PrintStream checkError() 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 PrintStream instance
PrintStream stream
= new PrintStream(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 check the stream
// using checkError() method
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 checkError() method
import java.io.*;
class GFG {
public static void main(String[] args)
{
try {
// Create a PrintStream instance
PrintStream stream
= new PrintStream(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 check the stream
// using checkError() method
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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