如何在Java中的文本文件中找到字符串？
随后的Java程序接受用户的String值，验证文件是否包含给定的String并打印单词出现的次数。
示例
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.util.Scanner;
public class FindingWordFromFile {
public static void main(String args[]) throws FileNotFoundException {
//读取要从用户找到的单词
Scanner sc1 = new Scanner(System.in);
System.out.println("Enter the word to be found");
String word = sc1.next();
boolean flag = false;
int count = 0;
System.out.println("Contents of the line");
//读取文件内容
Scanner sc2 = new Scanner(new FileInputStream("D:\\sampleData.txt"));
while(sc2.hasNextLine()) {
String line = sc2.nextLine();
System.out.println(line);
if(line.indexOf(word)!=-1) {
flag = true;
count = count+1;
}
}
if(flag) {
System.out.println("File contains the specified word");
System.out.println("Number of occurrences is: "+count);
} else {
System.out.println("File does not contain the specified word");
}
}
}输出结果
Enter the word to be found the Contents of the line nhooo.com originated from the idea that there exists a class of readers who respond better to online content and prefer to learn new skills at their own pace from the comforts of their drawing rooms. The journey commenced with a single tutorial on HTML in 2006 and elated by the response it generated, we worked our way to adding fresh tutorials to our repository which now proudly flaunts a wealth of tutorials and allied articles on topics ranging from programming languages to web designing to academics and much more. 40 million readers read 100 million pages every month Our content and resources are freely available and we prefer to keep it that way to encourage our readers acquire as many skills as they would like to. We don’t force our readers to sign up with us or submit their details either. No preconditions and no impediments. Simply Easy Learning! File contains the specified word Number of occurrences is: 3