代碼如下：

package PrintWriterPack;import java.io.FileNotFoundException; import java.io.PrintWriter;public class PrintWriterDemo {public static void main(String[] args) throws FileNotFoundException {PrintWriter pw = new PrintWriter("D:\\JavaDemo\\pw.txt");pw.write("hello");pw.write("\r\n");pw.flush();pw.write("\r\n");pw.write("world");pw.flush();pw.close();} } package PrintWriterPack;import java.io.FileNotFoundException; import java.io.PrintWriter;public class PrintWriterDemo {public static void main(String[] args) throws FileNotFoundException {PrintWriter pw = new PrintWriter("D:\\JavaDemo\\pw.txt");pw.println("hello");pw.flush();pw.println("world");pw.flush();pw.close();}} package PrintWriterPack;import java.io.FileNotFoundException; import java.io.FileWriter; import java.io.IOException; import java.io.PrintWriter;public class PrintWriterDemo {public static void main(String[] args) throws IOException {PrintWriter pw = new PrintWriter(new FileWriter("D:\\JavaDemo\\pw.txt"),true);pw.println("hello");pw.println("world");pw.close();}}

總結

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