Java directly uses the copied safe path to open the file error, and the error disappears after manual input

Copy the path directly, and then run, an error will occur.

The error is as follows, I don't know why.

After that, re-enter the same path and the error disappeared.

Wrong code

package try_a_package;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

class copyFirst {
    
    
	public static void main(String args[])
	{
    
    
		// 得到当前工作目录
		String curPath=System.getProperty("user.dir");
		System.out.println(curPath);
		// 文件输入输出
		try {
    
    
			File f1=new File("‪D:\\file1.txt");
			File f2=new File("D:\\file2.txt");
			FileInputStream in = new FileInputStream(f1);
			FileOutputStream out=new FileOutputStream(f2);
			System.out.println(in.available());
			while(in.available()>0)
			{
    
    
				int ch=in.read();
				out.write(ch);
			}
			in.close();
			out.close();
			System.out.println("Success");
		}
		catch(FileNotFoundException e) {
    
    
			System.out.println("错误，该文件打不开！");
		}
		catch(IOException e) {
    
    
			System.out.println("错误，文件不能读写!");
		}
	}
}

Correct code

package try_a_package;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

class copyFirst {
    
    
	public static void main(String args[])
	{
    
    
		// 得到当前工作目录
		String curPath=System.getProperty("user.dir");
		System.out.println(curPath);
		// 文件输入输出
		try {
    
    
			File f1=new File("D:\\file1.txt");
			File f2=new File("D:\\file2.txt");
			FileInputStream in = new FileInputStream(f1);
			FileOutputStream out=new FileOutputStream(f2);
			System.out.println(in.available());
			while(in.available()>0)
			{
    
    
				int ch=in.read();
				out.write(ch);
			}
			in.close();
			out.close();
			System.out.println("Success");
		}
		catch(FileNotFoundException e) {
    
    
			System.out.println("错误，该文件打不开！");
		}
		catch(IOException e) {
    
    
			System.out.println("错误，文件不能读写!");
		}
	}
}

These two codes are exactly the same in CSDN, but after I copied and ran, an error did occur. I don't know the principle.
Blind guessing: Is there a coding problem?

(Big guy teaches me!)