Question

我对java很新，我不明白我得到的错误。 Eclipse不建议我如何解决它。

我的以下代码出现以下错误：

“令牌上的语法错误”getChannel“，此标记后的标识符”

import java.io.FileOutputStream;
import java.net.URL;
import java.nio.channels.Channels;
import java.nio.channels.ReadableByteChannel;

public class main {
    URL website = new URL("http://ts.vtggames.net/extras.zip");
    ReadableByteChannel rbc = Channels.newChannel(website.openStream());
    FileOutputStream fos = new FileOutputStream("extras.zip");
    fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE);
}

Answer 1

这是一个声明：

fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE);

它必须进入一个块：基本上，它必须位于包含在{}中的类中的一些语法结构中。

其他行是变量声明。这些可以走出街区;这就是第一个语法错误在fos.getChannel()行上的原因。

您可以将所有行放在main方法中，如下所示：

public class main {
  public static void main(String[] args) {  // <-- Add this line
    URL website = new URL("http://ts.vtggames.net/extras.zip");
    ReadableByteChannel rbc = Channels.newChannel(website.openStream());
    FileOutputStream fos = new FileOutputStream("extras.zip");
    fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE);
  }  // <-- and this line
}

Answer 2

正如@AndyTurner所提到的，这不是适当的Java代码

Java中的类应以大写字母
您应该将主要代码放在方法
应提供/** * Updates the text of a given element in the properties file. * * @param id The id of the element * @param newText The text that will replace the original text. * * @throws IOException If I/O error occurs */ public void updateElementText(String id, String newText) throws IOException { Assertions.checkNotNull(id, "Id must not be null."); Assertions.checkNotNull(id, "Id must not be an empty string."); File file = new File(pathName); BufferedReader br = new BufferedReader(new FileReader(file)); BufferedWriter wr = new BufferedWriter(new FileWriter(file, true)); try { String line; while((line = br.readLine()) != null) { if(line.contains(id)) { //returns true System.out.println("Is line there: " + line.contains(id)); //returns helloText System.out.println("ID: " + extractId(line)); //returns How are you System.out.println("TEXT: " + extractText(line)); //returns Some new text for a change System.out.println("NEW_TEXT: " + newText); // This is where I am trying to replace the old text // with new text that came from the main method. line = line.replaceAll(extractText(line), newText); //wr.newLine(); wr.write(line); } } } catch(IOException e) { e.printStackTrace(); } finally { wr.close(); } } /** * Gets the id part of a line that is stored in the * properties file. * * @param element The element the id is got from. * @return String representation of the id. */ private static String extractId(String line) { final int commaOccurence = getFirstCommaOccurrence(line); return line.substring(0, commaOccurence); } /** * Gets the text part of a line that is stored in the * properties file. * * @param element The element the text is got from. * @return String representation of the text. */ private static String extractText(String line) { final int commaOccurence = getFirstCommaOccurrence(line); return line.substring(commaOccurence + 1, line.length()); } /** * Gets the first occurrence of a comma in any given line of a text file. * @param element * @return */ private static int getFirstCommaOccurrence(String line) { return line.indexOf(","); }来运行独立类

了解Java语法错误

2 个答案: