System.out.print("/b") 會在控制台下往回刪掉一個字符，如果你想回刪多個字符就打印多個"/b"
複製代碼代碼如下:
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();
}