小编jyo*_*jyo的帖子

Date d = new Date(0L); 

这是什么0L意思Date d？

What is the role of BPM (BussinessProcessManagement) in a realtime application?
I mean in which cases or where is BPM actually used?
I could get the documentation from the net, but where actually is it used?

鉴于:

public class LineUp {
    public static void main(String[] args) {
        double d = 12.345;
        // insert code here
    }
}

在第4行插入哪个代码片段会产生输出| 12.345|？

A. System.out.printf("|%7d| \n", d);
B. System.out.printf("|%7f| \n", d);
C. System.out.printf("|%3.7d| \n", d);
D. System.out.printf("|%3.7f| \n", d);
E. System.out.printf("|%7.3d| \n", d);
F. System.out.printf("|%7.3f| \n", d);
Answer: F

Run Code Online (Sandbox Code Playgroud)

printf语句的解释是什么,为什么是|%7d | 正在给予illegalFormatConversionException ?

谢谢