Java printf使用可变字段大小?
我只是想将一些 C 代码转换为 Java，但我在使用 String.printf 时遇到了一点问题.
I'm just trying to convert some C code over to Java and I'm having a little trouble with String.printf.
在 C 中，要根据变量获取特定宽度，我可以使用:
In C, to get a specific width based on a variable, I can use:
printf("Current index = %*d
", sz, index);
它会根据 sz 将整数格式化为特定大小.
and it will format the integer to be a specific size based on sz.
尝试:
System.out.println(String.format("Current index = %*d
", sz, index));
导致错误，因为它不喜欢 *.
results in an error since it doesn't like the *.
我目前有以下杂物:
System.out.println(String.format("Current index = %" + sz + "d
", index));
但我希望有更好的方法，是吗?
but I'm hoping there's a slightly better way, yes?
推荐答案
在使用printf之前声明一个额外的变量:
Declare an extra variable before using printf:
String format = "%" + fieldSize + "d";
System.out.printf(format, yourVariables);
(这是我从网络搜索中找到的第一个解决方案)
(this is the first solution I found from a web search)
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