使用扫描仪从文本文件中读取字符串，然后打印出

问题描述

我有一个文本文件，其中包含字符串-"!- =========== ALL OBJECTS IN CLASS: FENESTRATIONSURFACE:DETAILED ==========="，如下面的代码所示.如果文本文件包含此字符串，则需要从文本文件中读取它，然后再次打印出来.问题是我无法弄清楚为什么我的代码没有打印出来.

I have a text file which has the string, - "!- =========== ALL OBJECTS IN CLASS: FENESTRATIONSURFACE:DETAILED ===========" in it as you can see in the code below. IF the text file contains this string I need to read it from the text file and then print it out again. The problem is I cant work out why my code is not printing it.

任何帮助将不胜感激！

public class Main {

    public static void main(String[] args) throws FileNotFoundException {

        File file = new File("C:/Users/Anton/Pictures/1 x geotransform0.5m shading.txt");

        Scanner scan = new Scanner(file);

            while(scan.hasNext()){
                String str = scan.next();

                if(str == "!-   ===========  ALL OBJECTS IN CLASS: FENESTRATIONSURFACE:DETAILED ==========="){
                    System.out.print(str);
                }
            }
            scan.close();
        }
}

推荐答案

使用下面的代码，扫描仪接下来仅给出一个单词，使用nextLine代替读取整行.

use below code, scanner next gives just a word use nextLine instead to read whole line..

Scanner scan = new Scanner(file);
            String str1 = scan.nextLine();

                if(str1.equals("!-   ===========  ALL OBJECTS IN CLASS: FENESTRATIONSURFACE:DETAILED ==========="))
                    System.out.println(str1);
                scan.close();

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