初学者Java的Netbeans：我如何显示循环jlabel？ [英] Beginner Java Netbeans: How do I display for loop in jlabel?
问题描述
我看过这个网站，没有什么能真正回答我的问题。这就是我的代码：
$ p $ //声明用户输入变量
int min，max;
//将用户输入分配给min和max
min = Integer.parseInt（Min.getText（））;
max = Integer.parseInt（Max.getText（））;
//使用for循环显示值
for（int n = min; n <= max; n ++）{
System.out.println（Integer.toString（ N））;
Output.setText（Integer.toString（n））;
}
和System.out.println（）产生正确的答案。例如，用户输入2和9，就会说：
运行：
2
3
4
5
6
7
8
9
但我试图设置文本的输出，只显示9.我知道他可能是愚蠢的简单，但嘿，我是一个初学者。任何帮助将不胜感激。
答案依赖。
你想把每一个数字放在一个新的行上，或者追加到 String 的末尾。你希望他们像个柜台一样单独显示吗？
如果你想按顺序显示数字，那么你可以使用像这样的东西...
JLabel label = new JLabel（）;
int min = 0;
int max = 10;
StringBuilder sb = new StringBuilder（128）;
for（int n = min; n <= max; n ++）{
sb.append（n）;
}
label.setText（sb.toString（））;
哪个会输出类似...
或者如果您想要一个新行的每一个数字，你可以使用...
JLabel label = new JLabel（）;
int min = 0;
int max = 10;
StringBuilder sb = new StringBuilder（128）;
sb.append（< html>）;
for（int n = min; n <= max; n ++）{
System.out.println（Integer.toString（n））;
sb.append（n）.append（< br>）;
}
sb.append（< / html>）;
label.setText（sb.toString（））;
哪个会输出类似...
< JTextArea 实际上会更简单，只需要将每个数字附加到它上面...
JTextArea editor = new JTextArea（10，10）;
editor.setEditable（false）;
int min = 0;
int max = 10;
StringBuilder sb = new StringBuilder（128）;
for（int n = min; n <= max; n ++）{
editor.append（Integer.toString（n）+\\\
）;
$ / code> 会输出类似...
<现在，如果你想动画，你需要做一些不同的事情，或者使用 javax.swing.Timer 或 SwingWorker
I have looked on this site and nothing has really answered my question. This is what my code looks like:
// declare user input variables
int min, max;
//assign user input to min and max
min = Integer.parseInt(Min.getText ());
max = Integer.parseInt(Max.getText ());
//use for loop to display the values
for (int n = min; n<= max; n++){
System.out.println(Integer.toString(n));
Output.setText(Integer.toString(n));
}
and the System.out.println () yields the correct answer. for instance, the user inputs 2 and 9, it will say:
run:
2
3
4
5
6
7
8
9
but the jLabel I'm trying to set the text to, Output, only displays 9. I know his might be stupidly simple but hey, I'm a beginner. Any help would be appreciated.
The answer "depends".
Do you want each number on a new line or appended to the end of the String. Do you want them displayed individually like a counter?
If you want the numbers display in sequence, then you could use something like this...
JLabel label = new JLabel();
int min = 0;
int max = 10;
StringBuilder sb = new StringBuilder(128);
for (int n = min; n <= max; n++) {
sb.append(n);
}
label.setText(sb.toString());
Which will output something like...
Or if you wanted each number of a new line, you could use...
JLabel label = new JLabel();
int min = 0;
int max = 10;
StringBuilder sb = new StringBuilder(128);
sb.append("<html>");
for (int n = min; n <= max; n++) {
System.out.println(Integer.toString(n));
sb.append(n).append("<br>");
}
sb.append("</html>");
label.setText(sb.toString());
Which will output something like...
Now, if you want this, it would actually be easier to use a JTextArea and simply append each number to it...
JTextArea editor = new JTextArea(10, 10);
editor.setEditable(false);
int min = 0;
int max = 10;
StringBuilder sb = new StringBuilder(128);
for (int n = min; n <= max; n++) {
editor.append(Integer.toString(n) + "\n");
}
Which will output something like...
Now, if you want to animate it, you're going to need to do things different, either using a javax.swing.Timer or SwingWorker
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