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法律研究如何在 Java 中查詢文字檔案中的字串？
下面的 Java 程式從使用者處接受一個字串值，驗證檔案是否包含給定的字串，並打印出該單詞出現的次數。
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 {
//Reading the word to be found from the user
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");
//Reading the contents of the file
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");
}
}
}輸出
Enter the word to be found the Contents of the line Tutorials Point 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
更新於： 10-9-2019
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