从多个 JTextField 中检索和分析数据答案

【问题标题】：Retrieving and Analysing data from multiple JTextFields从多个 JTextField 中检索和分析数据
【发布时间】：2015-07-19 22:43:24
【问题描述】：

我正在创建一个程序，用户输入他们所有作业的成绩和每个作业的权重，然后程序计算总成绩。

在此处/互联网的大量帮助下，几乎完成了该程序，但我不知道如何执行最后一部分。

因此，当用户点击进入程序时，程序将汇总所有标记并考虑其特定权重并输出平均值。例如：

这样的公式是重量/100*马克。（将它们加在一起）。所以... (40/100)*60 + (40/100)*80... 等等

那么我怎样才能用我的程序做到这一点呢？我需要实现某种类型的 for 循环，因为分配的数量一直在变化。

我已经在 Enter 按钮上实现了一个动作侦听器，以便将标记/重量/分配计数器传递给下一个类。

但是，actionlistener 只记录最后一个标记/权重。所以在上面的例子中是 50 和 20。这是我面临的另一个问题。

所以基本上我要求一种从所有 JTextField 获取输入并分析它们以创建一个汇总所有分数的输出的方法。（考虑到它们的重量）

代码：

public class test{

public JButton button;

private static final Insets normalInsets = new Insets(10,10,0,10);
private static final Insets finalInsets = new Insets(10,10,10,10);

private static JPanel createMainPanel(){
    GridBagConstraints gbc = new GridBagConstraints();

    //Adding the JPanels. Panel for instructions
    JPanel panel = new JPanel();
    panel.setLayout(new GridBagLayout());

    int gridy = 1;

    //JLabel for the Instructions
    JTextArea instructionTextArea = new JTextArea(5, 30);
    instructionTextArea.setEditable(false);
    instructionTextArea.setLineWrap(true);
    instructionTextArea.setWrapStyleWord(true);

    JScrollPane instructionScrollPane = new JScrollPane(instructionTextArea);
    addComponent(panel, instructionScrollPane, 0, gridy++, 3, 1, finalInsets, GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL);

    //JLabels for Assignment
    JLabel label1 = new JLabel("Assignment");
    label1.setHorizontalAlignment(JLabel.CENTER);
    addComponent(panel, label1, 0, gridy, 1, 1, finalInsets,GridBagConstraints.CENTER,GridBagConstraints.HORIZONTAL);

    //JLabel for Mark
    JLabel label2 = new JLabel("Mark");
    label2.setHorizontalAlignment(JLabel.CENTER);
    addComponent(panel, label2, 1, gridy, 1, 1, finalInsets, GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL);

    //JLabel for Weight.
    JLabel label3 = new JLabel("Weight");
    label3.setHorizontalAlignment(JLabel.CENTER);
    addComponent(panel, label3, 2, gridy++, 1, 1, finalInsets, GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL);

    //JLabel Number for the number list of assignments at the side.
    gbc.gridy = 3;

    for(int i = 1; i<=3; i++){
        String kok = String.valueOf(i);
    JLabel number = new JLabel(kok);
    number.setHorizontalAlignment(JLabel.CENTER);
    addComponent(panel, number, 0, gbc.gridy++, 1, 1, normalInsets, GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL);
    }
    gbc.gridy =3;

    //JTextfield for Mark
    for(int i=0; i<3; i++){
    JTextField mark = new JTextField(20);
    mark.setHorizontalAlignment(JLabel.CENTER);
    addComponent(panel, mark, 1, gbc.gridy++, 1, 1, normalInsets, GridBagConstraints.CENTER,GridBagConstraints.NONE);
    }
    gbc.gridy = 3;

    //JTextfield for Weight       
    for(int i=0; i<3; i++){    
    JTextField weight = new JTextField(20);
    weight.setHorizontalAlignment(JLabel.CENTER);   
    addComponent(panel, weight, 2, gbc.gridy++, 1, 1, normalInsets, GridBagConstraints.CENTER,GridBagConstraints.NONE);
    }

    JButton button = new JButton("Enter");
    button.setHorizontalAlignment(SwingConstants.CENTER);
    addComponent(panel, button, 3, gbc.gridy++, 1, 1, normalInsets, GridBagConstraints.CENTER,GridBagConstraints.CENTER);

return panel;
}

private static void addComponent(Container container, Component component, int gridx, int gridy, int gridwidth, int gridheight, Insets insets, int anchor, int fill ){
    GridBagConstraints grid = new GridBagConstraints(gridx, gridy, gridwidth, gridheight, 1.0D,1.0D,anchor,fill,insets,0,0);
    container.add(component,grid);
}


    public static void main(String[] args) {    
    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.add(createMainPanel());
    frame.pack();
    frame.setVisible(true);
    new test();
}

具有标记/重量信息的下一个类。

public class test1 implements ActionListener { 

 private final JTextField mark;
 private final JTextField weight;



public test1(JTextField mark, JTextField weight) {
    this.mark = mark;
    this.weight = weight;

}


@Override
public void actionPerformed(ActionEvent e) {

String markstring = mark.getText();
String weightstring = weight.getText();

double markdouble = Double.parseDouble(markstring);
double weightdouble = Double.parseDouble(weightstring);  

}

【问题讨论】：

保留对集合或数组中文本字段的引用（“未知数字”表示集合）。迭代集合以计算最终结果。
是的，我正在考虑使用 for 循环来填充数组以获取标记/权重，但不确定如何为多个 JTextField 启动它
.. 好的。你在此基础上研究了什么？您尝试过什么？
比如我试过做 JTextField[] mark = new JTextField(20); .这不适用于我的代码，因为我需要它是一个直接的 JTextField 来解决格式问题。

标签： java swing actionlistener jtextfield

【解决方案1】：

您只需将JTextFields 保存在矢量中，以便以后访问它们。
您不需要第二节课。

您的按钮的侦听器也已创建。

import java.awt.Component;
import java.awt.Container;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.SwingConstants;

public class Test {
    public JButton button;

    private static final Insets normalInsets = new Insets(10,10,0,10);
    private static final Insets finalInsets = new Insets(10,10,10,10);

    public final static int NUM_OF_FIELDS = 3;

    private static JTextField[] markTextFields = new JTextField[NUM_OF_FIELDS];
    private static JTextField[] weightTextFields = new JTextField[NUM_OF_FIELDS];

    private static JPanel createMainPanel() {
        GridBagConstraints gbc = new GridBagConstraints();

        //Adding the JPanels. Panel for instructions
        JPanel panel = new JPanel();
        panel.setLayout(new GridBagLayout());

        int gridy = 1;

        //JLabel for the Instructions
        JTextArea instructionTextArea = new JTextArea(5, 30);
        instructionTextArea.setEditable(false);
        instructionTextArea.setLineWrap(true);
        instructionTextArea.setWrapStyleWord(true);

        JScrollPane instructionScrollPane = new JScrollPane(instructionTextArea);
        addComponent(panel, instructionScrollPane, 0, gridy++, 3, 1, finalInsets, GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL);

        //JLabels for Assignment
        JLabel label1 = new JLabel("Assignment");
        label1.setHorizontalAlignment(JLabel.CENTER);
        addComponent(panel, label1, 0, gridy, 1, 1, finalInsets,GridBagConstraints.CENTER,GridBagConstraints.HORIZONTAL);

        //JLabel for Mark
        JLabel label2 = new JLabel("Mark");
        label2.setHorizontalAlignment(JLabel.CENTER);
        addComponent(panel, label2, 1, gridy, 1, 1, finalInsets, GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL);

        //JLabel for Weight.
        JLabel label3 = new JLabel("Weight");
        label3.setHorizontalAlignment(JLabel.CENTER);
        addComponent(panel, label3, 2, gridy++, 1, 1, finalInsets, GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL);

        //JLabel Number for the number list of assignments at the side.
        gbc.gridy = 3;

        for (int i = 1; i <= 3; i++) {
            String kok = String.valueOf(i);
            JLabel number = new JLabel(kok);
            number.setHorizontalAlignment(JLabel.CENTER);
            addComponent(panel, number, 0, gbc.gridy++, 1, 1, normalInsets, GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL);
        }
        gbc.gridy = 3;

        //JTextfield for Mark
        for (int i = 0; i < NUM_OF_FIELDS; i++) {
            JTextField mark = new JTextField(20);
            markTextFields[i] = mark;
            mark.setHorizontalAlignment(JLabel.CENTER);
            addComponent(panel, mark, 1, gbc.gridy++, 1, 1, normalInsets, GridBagConstraints.CENTER, GridBagConstraints.NONE);
        }
        gbc.gridy = 3;

        //JTextfield for Weight       
        for (int i = 0; i < NUM_OF_FIELDS; i++) {    
            JTextField weight = new JTextField(20);
            weightTextFields[i] = weight;
            weight.setHorizontalAlignment(JLabel.CENTER);   
            addComponent(panel, weight, 2, gbc.gridy++, 1, 1, normalInsets, GridBagConstraints.CENTER,GridBagConstraints.NONE);
        }

        JButton button = new JButton("Enter");
        button.setHorizontalAlignment(SwingConstants.CENTER);
        addComponent(panel, button, 3, gbc.gridy++, 1, 1, normalInsets, GridBagConstraints.CENTER,GridBagConstraints.CENTER);
        button.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                double finalScore = 0;
                for (int i = 0; i < NUM_OF_FIELDS; i++) {
                    double weight = Double.parseDouble(weightTextFields[i].getText());
                    double mark = Double.parseDouble(markTextFields[i].getText());
                    finalScore += weight / 100 * mark;
                }
                JOptionPane.showMessageDialog(null, "Final score: " + finalScore, "Final Score", JOptionPane.OK_OPTION);
            }
        });
        return panel;
    }

    private static void addComponent(Container container, Component component, int gridx, int gridy, int gridwidth, int gridheight, Insets insets, int anchor, int fill) {
        GridBagConstraints grid = new GridBagConstraints(gridx, gridy, gridwidth, gridheight, 1.0D, 1.0D, anchor, fill, insets, 0, 0);
        container.add(component, grid);
    }

    public static void main(String[] args) {    
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(createMainPanel());
        frame.pack();
        frame.setVisible(true);
        new Test();
    }
}

【讨论】：

非常感谢。正在研究 Vectors，这为我节省了大量时间。再次感谢。
Vector?我们生活在哪一年？ static 也不是你的朋友，这会咬你的后背
如果他在学习，为什么不从学习向量是什么开始呢？我试图获取他的代码并进行简单的更改，以便事情可以按照他想要的方式进行。你为什么不给他一个更好的解决方案，教他如何使用列表和非静态方法/变量，而不是制作那种 cmets？ :)