System.out.print("\b") 会在控制台下往回删掉一个字符，如果你想回删多个字符就打印多个 "\b"

这个代码也可以参考一下：

public static void main(String[] args) throws Exception {

System.out.print("Progress:");

for (int i = 1; i <= 100; i++) {

System.out.print(i + "%");

Thread.sleep(100);

for (int j = 0; j <= String.valueOf(i).length(); j++) {

System.out.print("\b");

}

}

System.out.println();

}