逐字符比较两个文件

Question

这是我的代码：

public static void main(String[] args) {
    Scanner console = new Scanner(System.in); 
    System.out.print("Type first file name to use: ");
    String filename1 = console.nextLine();
    System.out.print("Type second file name to use: ");
    String filename2 = console.nextLine();
    Scanner input1 = new Scanner(new File(filename1));
    Scanner input2 = new Scanner(new File(filename2));
    String s1 = input1.next();
    String s2 = input2.next();
    boolean similar=true;r
while(!input1.hasNext()&&!input2.hasNext()){
// this is where i am stuck. i need to compare the lines character by character, but i'm not sure how to do so. i can't use buffer method, or any really advanced methods since i am just a beginner, so sticking to the basic loops (while, iff, for.. ) is the only option i have
} 

程序应提示用户输入两个文件名，并根据文件内容是否相同来打印true或false，并应逐字符检查文件，并忽略大小写（大写和小写）字母字符。 谢谢。

Answer 1

采用：

if (s1.equalsIgnoreCase(s2)) {
    // All characters on the entire line are equal.
} else {
    // There is a difference
}

它将一次一行地比较字符串。

您可以创建一个循环，但是这将需要更多代码，并且会导致性能降低。

Answer 2

一个又一个字符地字符，不允许当前的结构执行任何工作？

while(!input1.hasNext()&&!input2.hasNext())
{
  char c1 = input1.next(".");
  char c2 = input2.next(".");

  if (c1!=c2)
  {
    //Files are not equal
  }
}

Answer 3

如果愿意，可以使用Reader实例逐个字符处理文件。 就像是 ：

BufferedReader reader1 = new BufferedReader(new FileReader("fileName1"));
BufferedReader reader2 = new BufferedReader(new FileReader("fileName2"));
int char1; // from first file
int char2; // from second file
// loop until the end of either file is reached
while ((char1 = reader1.read()) != -1 && (char2 = reader2.read()) != -1) {
    // convert current characters from both files to lowerCase
    char lowerCase1 = Character.toLowerCase((char) char1);
    char lowerCase2 = Character.toLowerCase((char) char2);
    if (lowerCase1 != lowerCase2) {
        System.out.println("your text files are different!");
        return;
    }
} 

Answer 4

您应该这样做：

public static void main(String[] args) {
    Scanner console = new Scanner(System.in); 
    System.out.print("Type first file name to use: ");
    String filename1 = console.nextLine();
    System.out.print("Type second file name to use: ");
    String filename2 = console.nextLine();
    Scanner input1 = new Scanner(new File(filename1));
    Scanner input2 = new Scanner(new File(filename2));
    String s1 = input1.next();
    String s2 = input2.next();
    boolean similar=true;r
    while(!input1.hasNext()&&!input2.hasNext()){
        if (a.findInLine(".").compareToIgnoreCase(b.findInLine(".")) != 0) {
            similar = false;
            break;
        }
    }

    if (similar && (a.hasNext() || b.hasNext())) // unequal sizes
        similar = false;
    System.out.println("Files are " + (similar ? "equal" : "unequal"));
    return 0;
}