File删除文件delete()和deleteOnExit()的区别

 public boolean delete() {
        SecurityManager security = System.getSecurityManager();
        if (security != null) {
            security.checkDelete(path);
        }
        if (isInvalid()) {
            return false;
        }
        return fs.delete(this);
    }

deleteOnExit:

 public void deleteOnExit() {
        SecurityManager security = System.getSecurityManager();
        if (security != null) {
            security.checkDelete(path);
        }
        if (isInvalid()) {
            return;
        }
        DeleteOnExitHook.add(path);
    }

我们发现
delete: 即刻删除此路径下的文件。
deleteOnExit：在jvm退出时才会执行删除此路径下的文件。