Question

我的作业要求使用输出显示行号。教授建议我用计数器来做，因为看到Java没有一种简单的方法来打印出当前的行号，我只是按照建议创建了一个计数器。以下代码如下：

  //Count Increment
    for (count = 1; count<= 5; count++)
    {

    }   

    //Display information
    System.out.println(count + "." + " " + "Street:"+ " " + streetName + " " +  "#" + streetNumber);
    System.out.println(count + "." + " " + "Total Rooms:"+ " " + numofRooms);
    System.out.println(count + "." + " " + "Total Area:"+ " " + totalSqFt + " sq.ft");
    System.out.println(count + "." + " " + "The price per Sq. Ft is " + "$" + priceperSqFt);
    System.out.println(count + "." + " " + "The estimated property value is "+ "$" + estimatedPropertyvalue);

然而，输出在6处启动行计数器，如下所示：

6. Street: park avenue #44
6. Total Rooms: 5
6. Total Area: 2500.0 sq.ft
6. The price per Sq. Ft is $120.4
6. The estimated property value is $301000.0

删除括号也无济于事。如何让行数正确表示1,2,3,4,5？

如果需要，请要求澄清!! 谢谢。

Answer 1

您的打印件位于for循环之外。当计数器为＆＃34; 6＆＃34;时，你的for循环结束。当它退出for循环时。这个变量不会改变，因此当前值是＆＃34; 6＆＃34;这就是为什么它总是打印＆＃34; 6＆＃34;在你的代码下面。如果要打印每条指令的行号，可以执行以下操作：

        count = 0;
        System.out.println(++count + "." + " " + "Street:"+ " " + streetName + " " +  "#" + streetNumber);

＆＃34; ++ count＆＃34;，你在写一行时增加变量，在第一种情况下它应该打印1然后2等等。希望这有助于：）

不需要循环，因为您只对每行计数一次。如果你将这些行放在一个从0到5的循环中，你将每行计数5次。因为您只需要计算每一行一次，您不需要循环，只需要我之前提到的简单增量。希望这清除了为什么不需要循环

Answer 2

我假设你有一个定义计数的行：

int count;

因此，在for循环之后，你将计数增加到6，然后开始打印，并在for循环的最后一个递增值处留下计数。

因此，删除for循环并只为每行输出预先增加count变量。

int count = 0;

//Display information
System.out.println( (++count) + "." + " " + "Street:"+ " " + streetName + " " +  "#" + streetNumber);

...

Answer 3

class Print{

    static int lineno = 0;

    private int static getLineNo(){
        lineno = lineno + 1;
        return lineno;
    }
}


//Display information
System.out.println(Print.getLineNo() + "." + " " + "Street:"+ " " + streetName + " " +  "#" + streetNumber);
System.out.println(Print.getLineNo() + "." + " " + "Total Rooms:"+ " " + numofRooms);
System.out.println(Print.getLineNo() + "." + " " + "Total Area:"+ " " + totalSqFt + " sq.ft");
System.out.println(Print.getLineNo() + "." + " " + "The price per Sq. Ft is " + "$" + priceperSqFt);
System.out.println(Print.getLineNo() + "." + " " + "The estimated property value is "+ "$" + estimatedPropertyv

计数增量器是错误的

3 个答案: