java如何以某种方式打印数组？

Question

所以我想在列表中打印我的数组。看起来像这样

      Word:        Count:
      Myths             2
         Of            15
  Babylonia            25

我似乎不知道如何以正确的方式打印它，以下是我目前掌握的代码。感谢您的帮助，谢谢

package program6;

import java.util.Scanner;
import java.io.File;
import java.io.FileNotFoundException;
import java.util.Arrays;

public class Program6 {

static String[] stringArray = new String[100];
static int[] intArray = new int[100];
static String fileName = "myths.txt";
static int currentWordIndex = 0;

public static void main(String[] args) throws FileNotFoundException {

      Scanner input = new Scanner(new File(fileName));

      while (input.hasNext()){
        String word = input.next();
        boolean alreadyExists = false;
        for (int i = 0; i < currentWordIndex; i++) {

            if(stringArray[i].equals(word)){
                alreadyExists = true;
                intArray[i]++;
                break;
            }
        }


      if(!alreadyExists && currentWordIndex <100){
        stringArray[currentWordIndex] = word;
        intArray[currentWordIndex++] = 1;
      }
    }

    System.out.println("Myths of Babylonia and Assyria");
    System.out.println("Word:          Count:");
    System.out.println(Arrays.toString(stringArray));
    System.out.println();
    System.out.println(Arrays.toString(intArray));
 }
}

Answer 1

使用格式和循环

System.out.println("Myths of Babylonia and Assyria");
System.out.println("Word:\t\tCount:");
for (int i = 0; i < stringArray.lengthl i++){
    System.out.printf("%s\t\t%d\n", stringArray[i], intArray[i]);

}

右对齐编辑

    System.out.println("Myths of Babylonia and Assyria");
    System.out.printf("%10s%10s\n", "Word", "Count");
    for (int i = 0; i < array1.length; i++) {
        System.out.printf("%10s%10d", array1[i], array2[i]);
        System.out.println();
    }

编辑：对其他书籍使用方法

public static void main(String[] args) throws FileNotFoundException{

    printCounts("myth.txt", "Babylonia and Assyria");
    System.out.println();
    printCounts("someOther.txt", "Some Other Title");
    System.out.println();
    printCounts("another.txt", "Another Title");
    System.out.println();
}

public static void printCounts(String filename, String title) throws FileNotFoundException {

    String[] stringArray = new String[100];
    int[] intArray = new int[100];
    int currentWordIndex = 0;
    Scanner input = new Scanner(new File(filename));

    while (input.hasNext()) {
        String word = input.next();
        boolean alreadyExists = false;
        for (int i = 0; i < currentWordIndex; i++) {

            if (stringArray[i].equals(word)) {
                alreadyExists = true;
                intArray[i]++;
                break;
            }
        }

        if (!alreadyExists && currentWordIndex < 100) {
            stringArray[currentWordIndex] = word;
            intArray[currentWordIndex++] = 1;
        }
    }

    System.out.println(title);
    System.out.printf("%10s%10s\n", "Word", "Count");
    for (int i = 0; i < stringArray.length; i++) {
        System.out.printf("%10s%10d", stringArray[i], intArray[i]);
        System.out.println();
    }
}

Answer 2

当你在做

System.out.println();

它实际上是在输出的最后打印一行

尝试使用

System.out.print("foo ");
System.out.println("bar");

看看这个page解释了系统的使用。printf以对齐列

System.out.printf( "%-15s %15s %n", heading1, heading2);

Answer 3

你必须正确地证明你的专栏。根据this stackoverflow question，列左对齐，前面有负号，右对齐，没有负号。你希望你的打印声明看起来像这样：

System.out.printf("%60s %3d", stringArray[i], intarray[i]));

可以通过这种方式改变列宽

此外：有人提到，使用print而不是println可以避免在每条语句的末尾打印一行