IntelliJ IDEA多屏后窗口不显示问题解决方案

import java.io.*;

/**
 * @author jiashubing
 * @since 2019/5/22
 */
public class DeleteLine {
  public static void main(String[] args) {
    String path = "C:\\Users\\jiashubing\\Desktop\\ttt\\workspace.xml";
    deleteLine(path);
  }

  private static String deleteLine(String path) {
    int a = path.lastIndexOf('/');
    int b = path.lastIndexOf('\\');
    if (a < 0 && b < 0) {
      return "没有目录分隔符";
    }

    //删除原来的备份文件
    String bakpath = path + ".bak";
    if (deleteFile(bakpath)) {
      return "删除原始的备份文件失败，备份文件为：" + bakpath;
    }

    String bakpath2 = path + ".bak2";
    if (deleteFile(bakpath2)) {
      return "删除原始的临时备份文件失败，备份文件为：" + bakpath2;
    }

    //创建临时备份文件
    File bakFile2 = new File(bakpath2);
    boolean nFlag = false;
    try {
      nFlag = bakFile2.createNewFile();
    } catch (IOException e) {
      return "创建临时备份文件失败，备份文件为：" + bakpath2 + " 错误信息为：" + e.getMessage();
    }
    if (!nFlag) {
      return "创建临时备份文件失败，备份文件为：" + bakpath2;
    }

    String ans = getAns(path);
    if (ans == null) {
      return "读取并修改原始文件失败";
    }

    if (!addNewFile(bakpath2, ans)) {
      return "将修改后的内容写入到新文件失败";
    }

    File oldFile = new File(path);
    boolean mvFlag = oldFile.renameTo(new File(bakpath));
    if (!mvFlag) {
      return "将原始文件重命名成备份文件失败";
    }

    boolean mvFlag2 = bakFile2.renameTo(new File(path));
    if (!mvFlag2) {
      return "将临时备份文件重命名成原始文件失败";
    }

    return "执行成功";
  }

  private static boolean deleteFile(String bakpath) {
    File bakFile = new File(bakpath);
    if (bakFile.exists() && bakFile.isFile()) {
      boolean delFlag = bakFile.delete();
      if (!delFlag) {
        return true;
      }
    }
    return false;
  }

  private static String getAns(String path) {
    File oldFile = new File(path);
    if (!oldFile.exists() || !oldFile.isFile()) {
      return null;
    }

    StringBuilder ans = new StringBuilder();
    String encoding = "UTF-8";
    try (InputStreamReader read = new InputStreamReader(
        new FileInputStream(oldFile), encoding);
       BufferedReader bufferedReader = new BufferedReader(read)) {
      String lineTxt = null;
      while ((lineTxt = bufferedReader.readLine()) != null) {
        if (lineTxt.contains("name=\"x\"") || lineTxt.contains("name=\"y\"")) {
          continue;
        }
        ans.append(lineTxt + "\n");
      }
    } catch (Exception e) {
      return null;
    }

    return ans.toString();
  }

  private static boolean addNewFile(String path, String ans) {
    File file = new File(path);

    try (Writer out = new FileWriter(file)) {
      out.write(ans);
    } catch (IOException e) {
      return false;
    }

    return true;
  }
}