在新的一行打印g.Drawstring for循环中运行时？ [英] Printing g.Drawstring on a new line when for loop is run?

问题描述

我已经设置了分配，我一直在这个小程序天了，试图找出一个解决方案，但我自己没有搜索量造就了一个答案，我可以找到适合完全是我所需要的。
问题是我需要创建一个Java小程序，告诉你一定长度的多的话怎么也有。所以，如果我输入你好，它会说：
长度为2的1个字
长度为5的1个字
我使用g.DrawString输出输入文本的结果。如果我输入多个单词，所有输入的单词的长度相同它将输出一行正确的信息。如果我输入不同长度的两句话但它仍然只输出一行，完全将忽略输入的最后一个字之前任何东西。我似乎无法弄清楚如何获得g.Drawstring向下移动一行。这里是code我到目前为止有：

I have been set an assignment and I have been working on this applet for days now, trying to figure out a solution myself but no amount of searching has brought up an answer which I can find to fit quite what I need. The problem is I need to create a java applet which tell you how many words of a certain length there are. So if I type "Hi There" it will say: 1 word of length 2 1 word of length 5 I am using g.DrawString to output the result of the entered text. If I enter more than one word and all the words entered are the same length it will output one line with the correct information. If I enter two words of different lengths however it will still only output one line and totally ignore anything before the last word entered. I just can't seem to figure out how to get g.Drawstring to move down a line. Here is the code I have so far:

import java.util.*;
import java.applet.Applet;
import java.awt.*; 
import java.awt.event.*; 

public class assignmentneat extends Applet implements ActionListener {

String pr_name;
TextField pr_input;


public void init()
 {
 pr_input = new TextField(50);
 add(pr_input);
 pr_input.addActionListener(this);
 }  

public void start()
 {
 pr_name = " ";
 } 

public void actionPerformed(ActionEvent e)
 {
 int a = 0;
 int b;

 pr_name = e.getActionCommand();
 String[] words = pr_name.split(" ");

  for (String word : words)
    if (a < word.length()) 
    a = word.length();
    int pr_count[] = new int[a+1]; 

  for (String word : words) {
    pr_count[word.length()]++; }

  for (b = 0; b < pr_count.length; b++){
    if (pr_count[b] > 0) {
    pr_name = ("There are " + pr_count[b] + " words of length " + b); 

   repaint();
      }
     }
    }

public void paint(Graphics g)
 {
  g.drawString(pr_name,100,100);
 }

}

整个程序完美的作品时，它只是里面像DrJava运行，它只是不希望，当它在小程序的形式工作。
的更新的
我要指出，我认识到使用一个JLabel等会更容易些，但我没有被教导什么做这个，我只是一直在学习Java的一个非常非常短的时间，我不希望使用任何我尚未至今任教。

The whole program works perfectly when its just run inside something like DrJava, it just doesn't want to work when it's in applet form. update I should mention, I realise using a Jlabel etc would be easier, but I haven't been taught anything to do with this, I've only been studying java for a very very short time and I don't want to use anything I haven't been taught so far.

推荐答案

您想要做的是有列表 字符串。希望你已经了解了列表，你可以使用数组但加入他们动态吸。

What you want to do is have List of Strings. Hopefully you have learned about Lists, you can use arrays but adding to them dynamically sucks.

使用列表，你可以做这样的事情在你的最后一个循环

Using a list you could do something like this in your last loop

public class assignment... {
    private List<String> list = new ArrayList<>();
    ....
    public void actionPerfomed(ActionEvent e) {
        ....
        // instead of this
        //for (b = 0; b < pr_count.length; b++){
            //if (pr_count[b] > 0) {
            //pr_name = ("There are " + pr_count[b] + " words of length " + b); 
            //repaint();
        //}

        // do this
        for (b = 0; b < pr_count.length; b++){
            if (pr_count[b] > 0) {
                list.add("There are " + pr_count[b] + " words of length " + b);
            }
        }
        repaint();  // repaint after all is added to the list.
    }
}

在你的油漆方法，你可以再通过列表循环。你需要做虽然什么，每一行，你需要更新是位置自其移动到下一行。既然你不能使用你还没有学到的东西，我不会建议的FontMetrics 它可以让你衡量字母的高度。而不是仅仅猜测的高度和递增是的每一行。事情是这样的。

In your paint method you could then loop through the list. What you need to do though, for each line, you need to update the y position since its moving to the next line. Since you can't use things you haven't learned, I won't suggest FontMetrics which lets you measure the height of letters. Instead just guess the height and increment the y for each line. Something like this

public void paint(Graphics g) {
    int y = 20;
    for (String s : list) {
        g.drawString(s, 20, y);
        y += 15;  // 15 is just a guess. Play with it til you get it right
    }
}

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