public static void main(String[] args) {
        File fa = new File("a.txt");
        File fb = new File("b.txt");
        
        try {
            
            if(!fb.exists()){
                fb.createNewFile();
            }
            
            ObjectInputStream ois = new ObjectInputStream (new FileInputStream(fa));
            ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(fb));
            
            char c = ois.readChar();
            oos.writeChar(c);
            
            oos.close();
            ois.close();
            
            fa.delete();
            
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

------解决方案--------------------

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Java code

public static void main(String[] args) {
        File fa = new File("a.txt");
        File fb = new File("b.txt");
        
        try {
            
            if(!fb.exists()){
      ……