Question

如果没有问题，我想要一些Java任务的帮助。我们刚刚开始，但我的老师希望我们自己做一堆研究，我无法弄清楚如何做作业。

我们有一个任务，他给我们10行不同的演讲，我们必须使用面向目标的编码来显示整个事物。到目前为止，我想到了如何设置变量以链接到第一个文件并在屏幕上显示内容，但是他希望我们限制每行上有多少个字符，这样他就不必永远地向侧面滚动在一行上读一个演讲。这使我处于这样一个位置，即我将在接下来的几个小时内为每个演讲的每个句子创建新的变量，我认为必须有一个更有效的方法。所以，我问了我的朋友（他去年参加了这个课程）的建议，他建议使用for循环在一定数量的字符后扫描空格并跳转到下一行继续，但我不知道如何做任何这个。到目前为止，我所有人都是我们的老师告诉我们使用的基本文件，以及10篇演讲中的第一篇的开头。

/**
* TextWriter is a program that uses objective coding to display 10 political speeches
 * @author () 
 * @version (10/12/16)
 */
public class TextWriter {
    private String textToDisplay;//text to be displayed
    public TextWriter() {
        textToDisplay = "";
    }
    public TextWriter(String inputText) {
    textToDisplay = inputText;
    }
    public void clearTextToDisplay() {
        textToDisplay = "";
    }
    public void setTextToDisplay(String inputText) {
        textToDisplay = inputText;
    }
    public String getTextToDisplay() {
        return textToDisplay;
    }
    public void display() {
        System.out.println(textToDisplay);
    }
}

和第二个，

 /**
 * Displays Washington's Farewell speech using objective oriented coding.
 * @author () 
 * @version (10/12/16)
 */
public class WashingtonFarewellDriver {
    public static void main(String[] args) {
        TextWriter wf1;
        wf1 = new TextWriter();
        wf1.setTextToDisplay("Friends and Citizens: The period for a new election of a citizen to administer the executive government of the United States being not far distant, and the time actually arrived when your thoughts must be employed in designating the person who is to be clothed with that important trust, it appears to me proper, especially as it may conduce to a more distinct expression of the public voice, that I should now apprise you of the resolution I have formed, to decline being considered among the number of those out of whom a choice is to be made.");
        wf1.display();
        TextWriter wf2;
        wf2 = new TextWriter("I beg you, at the same time, to do me the justice to be assured that this resolution has not been taken without a strict regard to all the considerations appertaining to the relation which binds a dutiful citizen to his country; and that in withdrawing the tender of service, which silence in my situation might imply, I am influenced by no diminution of zeal for your future interest, no deficiency of grateful respect for your past kindness, but am supported by a full conviction that the step is compatible with both.");
        wf2.display();
        TextWriter wf3;
        wf3 = new TextWriter("The acceptance of, and continuance hitherto in, the office to which your suffrages have twice called me have been a uniform sacrifice of inclination to the opinion of duty and to a deference for what appeared to be your desire. I constantly hoped that it would have been much earlier in my power, consistently with motives which I was not at liberty to disregard, to return to that retirement from which I had been reluctantly drawn.");
        wf3.display();
    }
}

（希望这格式正确）我希望我可以帮忙找家庭作业帮助，因为它似乎有点被人瞧不起，但我很困惑，希望有人可以解释一下是什么。比我的老师多一点。谢谢！如果有任何问题，我也可以回答它们。

Answer 1

有很多方法可以解决这个问题。

您可以在TextWriter课程中添加此功能，以添加以下内容：

public void addLines(int maxChars){
    int lines = 1;
    String[] lineStrings; 

    if(maxChars <= textToDisplay.length()){
        if(textToDisplay.length() % maxChars > 0)  lines = textToDisplay.length()/maxChars + 1;
        else lines = textToDisplay.length()/maxChars;

        lineStrings = new String[lines];

        for(int i = 0; i < lines; i++){
            if(i == (lines - 1)) lineStrings[i] = textToDisplay.substring(i*maxChars, i*maxChars + (textToDisplay.length() % maxChars)) + "\r\n";
            else lineStrings[i] = textToDisplay.substring(i*maxChars, i*maxChars + maxChars) + "\r\n";
        }

        textToDisplay = "";

        for(int i=0; i < lines; i++){
            textToDisplay += lineStrings[i];
        }
    }
}

在你的主要功能中，也许：

public class WashingtonFarewellDriver {
    public static void main(String[] args) {
        TextWriter wf1;
        wf1 = new TextWriter();
        wf1.setTextToDisplay("Friends and Citizens: The period for a new election of a citizen to administer the executive government of the United States being not far distant, and the time actually arrived when your thoughts must be employed in designating the person who is to be clothed with that important trust, it appears to me proper, especially as it may conduce to a more distinct expression of the public voice, that I should now apprise you of the resolution I have formed, to decline being considered among the number of those out of whom a choice is to be made.");
        wf1.addLines(50); 
        wf1.display();
        TextWriter wf2;
        wf2 = new TextWriter("I beg you, at the same time, to do me the justice to be assured that this resolution has not been taken without a strict regard to all the considerations appertaining to the relation which binds a dutiful citizen to his country; and that in withdrawing the tender of service, which silence in my situation might imply, I am influenced by no diminution of zeal for your future interest, no deficiency of grateful respect for your past kindness, but am supported by a full conviction that the step is compatible with both.");
        wf2.addLines(50); 
        wf2.display();
        TextWriter wf3;
        wf3 = new TextWriter("The acceptance of, and continuance hitherto in, the office to which your suffrages have twice called me have been a uniform sacrifice of inclination to the opinion of duty and to a deference for what appeared to be your desire. I constantly hoped that it would have been much earlier in my power, consistently with motives which I was not at liberty to disregard, to return to that retirement from which I had been reluctantly drawn.");
        wf3.addLines(50); 
        wf3.display();
    }
}

这应该可行，但有些单词会被截断，因为这只会粗略地将行与行中的最大字符分开。

Answer 2

使用String.charAt（）逐字符循环字符串。跟踪你已经放出了多少个字符。下次当你看到一个空格吐出换行符后再说25个字符后，将你的计数器重置为0，然后重新开始打印出来。

String in = "This is a run on sentence that is too long for a single line and should be broken up into multiple lines because I said so. This is a run on sentence that is too long for a single line and should be broken up into multiple lines because I said so.";

int counter=0;

for(int i=0;i<in.length();i++){
  Char c=in.charAt(i);
  counter++;
  System.out.print(c+"");
  if((counter>25)&&(c=' ')){
    System.out.println();
    counter=0;
  }
}

Answer 3

感谢所有的反馈，它帮助了我，但最终还有另一个非常简单的方法，我的朋友带我使用他下载的main.org.apache.commons.lang3.text.WordUtils包！

import java.io.IOException;
import org.apache.commons.lang3.text.WordUtils;
public class WashingtonFarewellDriver {
    public static void main(String[] args) throws IOException {
        int wwl = 110;
        TextWriter wf1;
        wf1 = new TextWriter(WordUtils.wrap("long sentences",wwl));
        wf1.display();
    }
}

如何限制一行中的字符并使显示转到下一行

3 个答案: