我正在尝试在 Java 中格式化两个数组以打印如下内容:
I'm trying to format two arrays in Java to print something like this:
Inventory Number Books Prices
------------------------------------------------------------------
1 Intro to Java $45.99
2 Intro to C++ $89.34
3 Design Patterns $100.00
4 Perl $25.00
我正在使用以下代码:
for(int i = 0; i < 4; i++) {
System.out.print(i+1);
System.out.print(" " + books[i] + " ");
System.out.print(" " + "$" + booksPrices[i] + " ");
System.out.print("
");
}
但是我得到了这个格式很差的结果:
But I am getting this poorly formatted result instead:
Inventory Number Books Prices
------------------------------------------------------------------
1 Intro to Java $45.99
2 Intro to C++ $89.34
3 Design Patterns $100.0
4 Perl $25.0
如何将所有列直接排列在顶部标题下方?
How would I go about lining all the columns up directly under the headers at the top?
有没有更好的方法来做到这一点?
Is there a better way to go about doing this?
你应该看看格式:
System.out.format("%15.2f", booksPrices[i]);
这将提供 15 个插槽,并在需要时用空格填充它.
which would give 15 slots, and pad it with spaces if needed.
但是,我注意到您没有右对齐您的数字,在这种情况下,您希望在书籍字段中左对齐:
However, I noticed that you're not right-justifying your numbers, in which case you want left justification on the books field:
System.out.printf("%-30s", books[i]);
这是一个工作片段示例:
Here's a working snippet example:
String books[] = {"This", "That", "The Other Longer One", "Fourth One"};
double booksPrices[] = {45.99, 89.34, 12.23, 1000.3};
System.out.printf("%-20s%-30s%s%n", "Inventory Number", "Books", "Prices");
for (int i=0;i<books.length;i++){
System.out.format("%-20d%-30s$%.2f%n", i, books[i], booksPrices[i]);
}
导致:
Inventory Number Books Prices
0 This $45.99
1 That $89.34
2 The Other Longer One $12.23
3 Fourth One $1000.30
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