📅 最后修改于: 2020-09-27 07:19:30 🧑 作者: Mango
Java PrintWriter类是Writer类的实现。它用于将格式化的对象表示形式打印到文本输出流。
让我们看一下Java.io.PrintWriter类的声明：
public class PrintWriter extends Writer
| Method | Description |
|---|---|
| void println(boolean x) | It is used to print the boolean value. |
| void println(char[] x) | It is used to print an array of characters. |
| void println(int x) | It is used to print an integer. |
| PrintWriter append(char c) | It is used to append the specified character to the writer. |
| PrintWriter append(CharSequence ch) | It is used to append the specified character sequence to the writer. |
| PrintWriter append(CharSequence ch, int start, int end) | It is used to append a subsequence of specified character to the writer. |
| boolean checkError() | It is used to flushes the stream and check its error state. |
| protected void setError() | It is used to indicate that an error occurs. |
| protected void clearError() | It is used to clear the error state of a stream. |
| PrintWriter format(String format, Object… args) | It is used to write a formatted string to the writer using specified arguments and format string. |
| void print(Object obj) | It is used to print an object. |
| void flush() | It is used to flushes the stream. |
| void close() | It is used to close the stream. |
让我们看一下使用Java PrintWriter类在控制台和文本文件testout.txt中写入数据的简单示例。
package com.javatpoint;
import java.io.File;
import java.io.PrintWriter;
public class PrintWriterExample {
public static void main(String[] args) throws Exception {
//Data to write on Console using PrintWriter
PrintWriter writer = new PrintWriter(System.out);
writer.write("Javatpoint provides tutorials of all technology.");
writer.flush();
writer.close();
//Data to write in File using PrintWriter
PrintWriter writer1 =null;
writer1 = new PrintWriter(new File("D:\\testout.txt"));
writer1.write("Like Java, Spring, Hibernate, Android, PHP etc.");
writer1.flush();
writer1.close();
}
}
出站
Javatpoint provides tutorials of all technology.
文本文件testout.txt的内容使用Java，Spring，Hibernate，Android，PHP等数据进行设置。