如何在 Java 中将输出格式化为表格？ [复制]

Question

我正在尝试为成绩报告制作一个表格，该表格应包含 5 列，分别是班级、描述、单位、成绩和成绩点。 但是，我无法使输出相互对齐。 我只是简单地使用“\t”。 有没有办法在 Java 中将输出制作为表格？

import java.util.*;
public class Project1_Trial2 {
    public static void main(String args[])
    {
        Scanner scanner = new Scanner(System.in);

        //Input the term
        System.out.println("Please enter the term of your grade calculation (for example, Fall 2015): ");
        String term = scanner.nextLine();

        //Input the number of courses that the student is enrolled in
        System.out.println("Please enter the number of courses that you are enrolled in "+term+": ");
        int numberofcourses = scanner.nextInt();

        //Declaration
        String ClassName[] = new String[numberofcourses];
        String Description[] = new String[numberofcourses];
        String Grade[] = new String[numberofcourses];
        int Units[] = new int[numberofcourses];

        //Arrays for class number, description, units, grade, grades point
        //Here, input class number, description, units, and grades
        for(int i = 0; i < numberofcourses; i++)
        {
            scanner.nextLine();
            System.out.println("Please enter your #"+(i+1)+" class name: ");
            ClassName[i] = scanner.nextLine();
            System.out.println("Please enter your #"+(i+1)+" class description: ");
            Description[i] = scanner.nextLine();
            System.out.println("Please enter your #"+(i+1)+" class units: ");
            Units [i] = scanner.nextInt();
            System.out.println("Please enter your #"+(i+1)+" class grade: ");
            Grade[i] = scanner.nextLine();
        }

        System.out.println("Class Grades - "+term+" Term");
        System.out.println("Office Grades");
        System.out.println("Class \t \t Description \t \t Units \t \t Grade \t \t Grade Points");
        for(int i = 0; i < numberofcourses; i++)
        {
        System.out.println(ClassName[i]+"\t \t"+Description[i]+"\t \t"+Units[i]+"\t \t"+Grade[i]);
        }
    }
}

Answer 1

有多种方法可以对齐您的输出，使它们均匀对齐....一种方法是替换您放置的位置：

System.out.println(ClassName[i]+"\t \t"+Description[i]+"\t \t"+Units[i]+"\t \t"+Grade[i]);

与：

System.out.printf("%-15s %-15s %-15s ",ClassName[i],Description[i],String.format("%5d", Units[i]),Grade[i]);

而不是使用System.out.println() 使用System.out.printf() 这样您可以填充字符串并在printf() 函数中使用String.format() 用空格填充整数...您可以将我的填充调整为您认为合适的任何内容 这是一种比不断使用标签更有效的方法