boyException in thread "main" java.util.IllegalFormatConversionException: d != Linkedlist.Boy

问题：
boyException in thread "main" java.util.IllegalFormatConversionException: d != Linkedlist.Boy
at java.base/java.util.Formatter$FormatSpecifier.failConversion(Formatter.java:4426)
at java.base/java.util.Formatter$FormatSpecifier.printInteger(Formatter.java:2938)
at java.base/java.util.Formatter$FormatSpecifier.print(Formatter.java:2892)
at java.base/java.util.Formatter.format(Formatter.java:2673)
at java.base/java.io.PrintStream.format(PrintStream.java:1053)
at java.base/java.io.PrintStream.printf(PrintStream.java:949)
at Linkedlist.CircleSingleLinkedList.countBoy(Joseph.java:86)
at Linkedlist.Joseph.main(Joseph.java:10)

为什么老是跑出异常？TT

```java
    public void showBoy() {
        if (first == null) {
            System.out.println("there is no boy!");
            return;
        }
        Boy curBoy = first;
        while (true) {
            System.out.printf("the boy's No is %d \n", curBoy.getNo());
            if (curBoy.getNext() == first) { //get the last No ,the traverse is finished
                break;
            }
            curBoy = curBoy.getNext();//move it
        }
    }

public void countBoy(int startNo, int count, int num) {
    if (first == null || startNo < 1 || startNo > num) {
        System.out.println("the parameters is wrong，please enter it again");
        return;
    }
    Boy helper = first;//创建一个辅助指针，帮小孩出圈
    while (true) {
        if (helper.getNext() == first) {//事先让helper指向最后一个节点
            break;
        }
        helper = helper.getNext();
    }
    //小孩报数前，先让first和helper移动 k-1 次
    for (int j = 0; j < startNo - 1; j++) {
        first = first.getNext();
        helper = helper.getNext();
    }
    //当小孩报数时，first和helper同时移动 m-1 次，然后出圈
    //因为这里是一个循环操作，直到圈中只有一个节点
    while (true) {
        if (helper == first) {//only one node
            break;
        }
        for (int j = 0; j < count - 1; j++) {//move (k - 1) node
            first = first.getNext();
            helper = helper.getNext();
        }
        System.out.printf("boy %d should go out \n", first.getNext());
        first = first.getNext();
        helper.setNext(first);//helper的指针域指向first 形成一个新环
    }
    System.out.printf("the last boy left in the CLL is %d \n", helper.getNext());


}

```