小编Jes*_*ssy的帖子

如何获取ArrayList的最后一个值？

我不知道ArrayList的最后一个索引.

我有两个arraylist filelist并且imgList彼此相关,例如与"e1.jpg"相关的"H1.txt".如何自动随机名单imgList根据随机化fileList？就像在Excel中一样,如果我们对某个列进行排序,另一列会自动跟随吗？

String [] file = {"H1.txt","H2.txt","H3.txt","M4.txt","M5.txt","M6.txt"};
ArrayList<String> fileList = new ArrayList<String>(Arrays.asList(file));

String [] img = {"e1.jpg","e2.jpg","e3.jpg","e4.jpg","e5.jpg","e6.jpg"};
ArrayList<String> imgList = new ArrayList<String>(Arrays.asList(img));

//randomized files
Collections.shuffle(fileList);

随机化后的输出例如:

fileList = {"M4.txt","M6.txt","H3.txt","M5.txt","H2.txt","H1.txt"};

预期输出:

 imgList = {"e4.jpg","e6.jpg","e3.jpg","e5.jpg","e2.jpg","e1.jpg"};

如何将JLabel的文本扩展到另一行？

我试图使用此代码建议(http://www.daniweb.com/forums/thread23883.html#)将控制台输出写入txt文件但是我没有成功.怎么了？

try {
      //create a buffered reader that connects to the console, we use it so we can read lines
      BufferedReader in = new BufferedReader(new InputStreamReader(System.in));

      //read a line from the console
      String lineFromInput = in.readLine();

      //create an print writer for writing to a file
      PrintWriter out = new PrintWriter(new FileWriter("output.txt"));

      //output to the file a line
      out.println(lineFromInput);

      //close the file (VERY IMPORTANT!)
      out.close();
   }
      catch(IOException e1) {
        System.out.println("Error during reading/writing");
   }

有没有办法隐藏光标(除了使用透明图像作为光标)？

如何从.txt文件中读取和显示数据？

如何将2维数组展平int originalArray[][]为1维数组？

    int a [] = {1,2,6,7,2};
    int b [] = {2,44,55,2};
    int c [] = {2,44,511,33};

    int originalArray [][] = new int[][]{a,b,c};

我想要绘制6个向量.我如何用不同的颜色(随机)制作每个图？使用下面的代码,图表限制为所有六个向量的一种颜色.

plot(x,y,'-rs','LineWidth',1,...
      'MarkerEdgeColor','k',...
      'MarkerFaceColor','g',...
      'MarkerSize',5);

我们如何在GridLayout中显示网格线？在Java？

JPanel panel = new JPanel(new GridLayout(10,10));
panel.setBorder(BorderFactory.createEmptyBorder(2,2,2,2));

for (int i =0; i<(10*10); i++){
   panel.add(new JLabel("Label"));
}

JPanel pMeasure = new JPanel();
....
JLabel economy = new JLabel("Economy");
JLabel regularity = new JLabel("Regularity");
pMeasure.add(economy);
pMeasure.add(regularity);
...

当我运行上面的代码时,我得到这个输出:

Economy Regularity

如何获得此输出,每个JLabel在新行上启动？谢谢

Economy  
Regularity