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();
}
