Java printf 格式化以打印表或列中的项目
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Java printf formatting to print items in a table or columns
提问by Vayelin
I am wanting to print things in a neat columns using printf.
我想使用 printf 在整齐的列中打印内容。
happening 0.083333 [4]
hi 0.083333 [0]
if 0.083333 [8]
important 0.083333 [7]
is 0.250000 [3, 5, 10]
it 0.166667 [6, 9]
tagged 0.083333 [11]
there 0.083333 [1]
what 0.083333 [2]
I have this code System.out.printf("%s %.6f %s \n", word, web.getFrequency(word), loc);, but it prints out this:
我有这个代码System.out.printf("%s %.6f %s \n", word, web.getFrequency(word), loc);，但它打印出这个：
happening 0.083333 [ 4 ]
hi 0.083333 [ 0 ]
if 0.083333 [ 8 ]
important 0.083333 [ 7 ]
is 0.250000 [ 3 5 10 ]
it 0.166667 [ 6 9 ]
tagged 0.083333 [ 11 ]
there 0.083333 [ 1 ]
what 0.083333 [ 2 ]
Any help would be appreciated.
任何帮助，将不胜感激。
回答by dmolony
I would use this:
我会用这个：
System.out.printf ("%-30s %1.7f %s%n", word, etc, etc2);
回答by lakerka
You can get the max length of all the word strings, and store that length in a variable, max. Use a for loop to get that max, and then create a Stringthat has the format with concatenating the normal printf format with the max variable to be used as the width. Additionally \tputs in a tab character.
您可以获得所有单词字符串的最大长度，并将该长度存储在一个变量中max。使用 for 循环来获取它max，然后创建一个String具有将普通 printf 格式与用作宽度的 max 变量连接起来的格式。另外\t放入一个制表符。
int max = 0;
for (int ii = 0; ii < numberOfStrings; ii++)
{
max = (word.length() > max) ? word.length() : max;
}
String format = "%" + max + "s\t%.6f\t%s \n";
System.out.printf(format, word, web.getFrequency(word), loc);
回答by Garen Goh
System.out.format("%-8s%-8s%-8s\n","a","b","pow(b,a)");
System.out.format("%-8d%-8d%-8d\n",1,2,1);
System.out.format("%-8d%-8d%-8d\n",2,3,8);
System.out.format("%-8d%-8d%-8d\n",3,4,81);
System.out.format("%-8d%-8d%-8d\n",4,5,1024);
System.out.format("%-8d%-8d%-8d\n",5,6,15625);
//the negative integer kinda sets it back to the number of space needed
回答by Shreya Sharma
input:
输入：
happening 0.083333 [4]
hi 0.083333 [0]
if 0.083333 [8]
important 0.083333 [7]
is 0.250000 [3, 5, 10]
it 0.166667 [6, 9]
tagged 0.083333 [11]
there 0.083333 [1]
what 0.083333 [2]
code:
代码：
import java.util.Scanner;
public class MyClass {
private static final Scanner sc = new Scanner(System.in);
public static void main(String args[]) {
for(int i = 0 ; i < 9; i++){
String str = sc.next();
float f = sc.nextFloat();
String str2 = sc.nextLine();
System.out.printf("%-10s %f %s\n", str, f, str2);
}
sc.close();
}
}
output:
输出：
happening 0.083333 [4]
hi 0.083333 [0]
if 0.083333 [8]
important 0.083333 [7]
is 0.250000 [3, 5, 10]
it 0.166667 [6, 9]
tagged 0.083333 [11]
there 0.083333 [1]
what 0.083333 [2]
use - to make the string left aligned, use field width to align them properly. In your case printf statement will be
使用 - 使字符串左对齐，使用字段宽度正确对齐它们。在你的情况下 printf 语句将是
System.out.printf("%-10s %.6f %s\n", word, web.getFrequency(word), loc);
