将字符从String复制到String

时间:2017-02-07 19:04:47

标签: java

我在一个项目中工作,我想要一些帮助。

所以这是我的测试代码:

 package test;

import java.io.*;

public class Main {
    public static void main(String [] args) {

        // The name of the file to open.
        String fileName = "C:\\Users\\karlk\\workspace\\Work\\src\\test\\tempx.txt";
        // This will reference one line at a time
        String line = null;

        try {
            // FileReader reads text files in the default encoding.
            FileReader fileReader = 
                new FileReader(fileName);

            // Always wrap FileReader in BufferedReader.
            BufferedReader bufferedReader = 
                new BufferedReader(fileReader);

            while((line = bufferedReader.readLine()) != null) {
                System.out.println(line);
            }   

            // Always close files.
            bufferedReader.close();         
        }
        catch(FileNotFoundException ex) {
            System.out.println(
                "Unable to open file '" + 
                fileName + "'");                
        }
        catch(IOException ex) {
            System.out.println(
                "Error reading file '" 
                + fileName + "'");                  
            // Or we could just do this: 
            // ex.printStackTrace();
        }
    }
}

tempx.txt

Karlken:Java:Male

这是我的简单问题

1)我想在一个名为“name”的字符串中写入':'(Karlken)之前的第一个单词,第二个单词写在另一个字符串(Java)中的':'之后,最后再写在另一个字符串中字符串我想写“男”我怎么样?

3 个答案:

答案 0 :(得分:0)

while((line = bufferedReader.readLine()) != null) {
  String text = line;
  String[] parts = string.split(":");
  String part1 = parts[0];
  String part2 = parts[1];
  String part2 = parts[2];
}

似乎更适合您的代码。

答案 1 :(得分:0)

如果文件中的文本格式是预定义的(即总是由单个:分隔的3个部分),那么以下内容应该足够了:

String text = readLineFromFile(filepath);
String[] parts = text.split(":");
String name = parts[0];
String lang = parts[1];
String gender = parts[2];

答案 2 :(得分:0)

您可以使用扫描仪:

public static void main(String[] args){
    String fileName = "C:\\Users\\karlk\\workspace\\Work\\src\\test\\tempx.txt";

    try(Scanner scanner = new Scanner(new File(fileName))){
        scanner.useDelimiter(":");

        String name = scanner.next();
        String lang = scanner.next();
        String sex = scanner.next();            
    }catch(FileNotFoundException ex) {
        System.out.println(
                "Unable to open file '" + 
                fileName + "'");                
    }catch(IOException ex) {
        System.out.println(
            "Error reading file '" 
            + fileName + "'");
    }
}