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好的，我有一个任务，我们要创建一个通用对类，然后测试它是否有效。pair 班有一定的要求必须遵守，但我们可以自由地对 test 班做我们想做的事。诚然，我有点过火了，但这只是因为玩弄想法可以帮助我学习课堂上没有涵盖的其他东西。现在，我不能展示通用类的东西，因为那部分是作业的重要部分，但至于我的测试类，我将全部展示。我正在尝试使我的第五个文本字段tf5（myScrollPane）。现在，我设置 keylistener 的方式是，它会将我在文本字段中输入的任何内容添加到 JScrollPanel 中，因为我正在输入它。因此，如果我键入 1、2、3、4，我会在面板上打印出 4 个数组列表（每个列表有 1 个数字）。我希望能够在文本字段中输入我想要的任何内容，并且只有在我按 Enter 后才将其传递到 JScrollPanel 中，但是对于我的生活，我只是无法弄清楚该怎么做。谁能帮我解决这个问题？这是我的代码：

package lab10;

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.lang.Integer.*;
import java.util.ArrayList;


public class Lab10 extends JFrame {

private Container content;
private JTextField tf1, tf2, tf3, tf4, tf5, tf6;
private JLabel lbl1, lbl2, lbl3, lbl4, lbl5, lbl6, lbl7, lbl8, lbl9, lbl10;
private Font myFont;
private JButton myBtn, myBtn2, tstb;
private JTextArea myTextArea;
private JScrollPane myScrollPane;
private KeyEvent x;
Integer I1, I2;
String S1, S2;
Double D1, D2;
ArrayList A1, A2;
Pair<Integer, Integer> myPairInt = new Pair<>(I1, I2);
Pair<String, Double> myPairStrDbl = new Pair<>(S1, D2);
Pair<ArrayList, String> myPairAryStr = new Pair<>(A1, S2);

public Lab10() {
    this(640, 540, "Testing a Generic Pair");
}

public Lab10(int width, int height, String title) {
    this.setVisible(true);
    this.setTitle(title);
    this.setSize(width, height);
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    guiComponent();

}

private void guiComponent() {
    SpringLayout layout = new SpringLayout();
    content = this.getContentPane();
    content.setLayout(layout);
    myFont = new Font("Magneto", Font.BOLD, 12);
    myBtn = new JButton("Do It!");
    myBtn2 = new JButton();
    myBtn2.setLayout(new BorderLayout());
    JLabel label1 = new JLabel("Click here to add elements to Array List");
    JLabel label2 = new JLabel("(Before you click the bottom button!)");
    myBtn2.add(BorderLayout.NORTH, label1);
    myBtn2.add(BorderLayout.SOUTH, label2);
    myBtn.addActionListener(new ButtonClick());
    myBtn2.addActionListener(new ArrayListClickAdd());
    lbl1 = new JLabel("Enter a string of numbers for me to count");
    lbl2 = new JLabel("Now enter another string of numbers for me to count");
    lbl3 = new JLabel("This is where I show you what you typed ");
    lbl4 = new JLabel("Now type a String and I'll count the Ascii sum ");
    lbl5 = new JLabel("Now type in a double, i.e. 2.4 or 2.3 or 5.6 ");
    lbl6 = new JLabel("This is where I show you what you typed ");
    lbl7 = new JLabel("Now Enter an Array List, (just a standard string of numbers) ");
    lbl8 = new JLabel("Now Enter a String and I will convert it all to uppercase");
    lbl9 = new JLabel("This is where I will show you what you've typed ");
    lbl10 = new JLabel();
    tf1 = new JTextField(8);
    tf2 = new JTextField(8);
    tf3 = new JTextField(8); 
    tf4 = new JTextField(8);
    tf5 = new JTextField(8); 
    tf6 = new JTextField(8);

        tf5.addKeyListener(new MyKeyEvent());

    myTextArea = new JTextArea();
    myTextArea.setColumns(12);
    myTextArea.setRows(8);
    myTextArea.setFont(myFont);


    content.add(lbl1);
    layout.putConstraint(SpringLayout.WEST, lbl1, 10, SpringLayout.WEST, content);
    layout.putConstraint(SpringLayout.NORTH, lbl1, 10, SpringLayout.NORTH, content);

    content.add(tf1);
    layout.putConstraint(SpringLayout.WEST, tf1, 10, SpringLayout.WEST, content);
    layout.putConstraint(SpringLayout.NORTH, tf1, 10, SpringLayout.SOUTH, lbl1);

    content.add(lbl2);
    layout.putConstraint(SpringLayout.WEST, lbl2, 10, SpringLayout.WEST, content);
    layout.putConstraint(SpringLayout.NORTH, lbl2, 10, SpringLayout.SOUTH, tf1);

    content.add(tf2);
    layout.putConstraint(SpringLayout.WEST, tf2, 10, SpringLayout.WEST, content);
    layout.putConstraint(SpringLayout.NORTH, tf2, 10, SpringLayout.SOUTH, lbl2);

    content.add(lbl3);
    layout.putConstraint(SpringLayout.WEST, lbl3, 10, SpringLayout.WEST, content);
    layout.putConstraint(SpringLayout.NORTH, lbl3, 10, SpringLayout.SOUTH, tf2);

    content.add(lbl4);
    layout.putConstraint(SpringLayout.WEST, lbl4, 10, SpringLayout.WEST, content);
    layout.putConstraint(SpringLayout.NORTH, lbl4, 10, SpringLayout.SOUTH, lbl3);

    content.add(tf3);
    layout.putConstraint(SpringLayout.WEST, tf3, 10, SpringLayout.WEST, content);
    layout.putConstraint(SpringLayout.NORTH, tf3, 10, SpringLayout.SOUTH, lbl4);

    content.add(lbl5);
    layout.putConstraint(SpringLayout.WEST, lbl5, 10, SpringLayout.WEST, content);
    layout.putConstraint(SpringLayout.NORTH, lbl5, 10, SpringLayout.SOUTH, tf3);

    content.add(tf4);
    layout.putConstraint(SpringLayout.WEST, tf4, 10, SpringLayout.WEST, content);
    layout.putConstraint(SpringLayout.NORTH, tf4, 10, SpringLayout.SOUTH, lbl5);

    content.add(lbl6);
    layout.putConstraint(SpringLayout.WEST, lbl6, 10, SpringLayout.WEST, content);
    layout.putConstraint(SpringLayout.NORTH, lbl6, 10, SpringLayout.SOUTH, tf4);

    content.add(lbl7);
    layout.putConstraint(SpringLayout.WEST, lbl7, 10, SpringLayout.WEST, content);
    layout.putConstraint(SpringLayout.NORTH, lbl7, 10, SpringLayout.SOUTH, lbl6);

    content.add(tf5);
    layout.putConstraint(SpringLayout.WEST, tf5, 10, SpringLayout.WEST, content);
    layout.putConstraint(SpringLayout.NORTH, tf5, 10, SpringLayout.SOUTH, lbl7);

    content.add(lbl8);
    layout.putConstraint(SpringLayout.WEST, lbl8, 10, SpringLayout.WEST, content);
    layout.putConstraint(SpringLayout.NORTH, lbl8, 10, SpringLayout.SOUTH, tf5);

    content.add(tf6);
    layout.putConstraint(SpringLayout.WEST, tf6, 10, SpringLayout.WEST, content);
    layout.putConstraint(SpringLayout.NORTH, tf6, 10, SpringLayout.SOUTH, lbl8);

    content.add(lbl9);
    layout.putConstraint(SpringLayout.WEST, lbl9, 10, SpringLayout.WEST, content);
    layout.putConstraint(SpringLayout.NORTH, lbl9, 10, SpringLayout.SOUTH, tf6);

    content.add(lbl10);
    layout.putConstraint(SpringLayout.WEST, lbl10, 10, SpringLayout.WEST, content);
    layout.putConstraint(SpringLayout.NORTH, lbl10, 2, SpringLayout.SOUTH, lbl9);

    myScrollPane = new JScrollPane(myTextArea);
    content.add(myScrollPane);
    layout.putConstraint(SpringLayout.WEST, myScrollPane, 250, SpringLayout.EAST, tf4);
    layout.putConstraint(SpringLayout.NORTH, myScrollPane, 1, SpringLayout.SOUTH, myBtn2);

    content.add(myBtn2);
    layout.putConstraint(SpringLayout.WEST, myBtn2, 3, SpringLayout.EAST, lbl7);
    layout.putConstraint(SpringLayout.NORTH, myBtn2, 8, SpringLayout.SOUTH, lbl6);

    content.add(myBtn);
    layout.putConstraint(SpringLayout.WEST, myBtn, 10, SpringLayout.WEST, content);
    layout.putConstraint(SpringLayout.NORTH, myBtn, 10, SpringLayout.SOUTH, lbl10);
}

private String upper(String y) {
    return y.toUpperCase();
}

private String getAsciiSum(String z) {
    int addSum = 0;
    for (int i = 0; i < z.length(); i++) {
        char x = z.charAt(i);
        int j = (int) x;
        addSum += x;
    }
    z = Integer.toString(addSum);
    return z;
}

int sumNums(int x) {
    String myNum = Integer.toString(x);
    int addSum = 0;
    for (int i = 0; i < myNum.length(); i++) {
        addSum += Character.digit(myNum.charAt(i), 10);
    }
    return addSum;
}

int[] getArray(int num) {
    String counter = "" + num;
    int digits = counter.length();
    int[] nums = new int[digits];
    for (int i = digits - 1; i >= 0; i--) {
        nums[i] = num % 10;
        num /= 10;
    }
    return nums;
}

private class MyKeyEvent implements KeyListener {

    public MyKeyEvent() {
    }

    @Override
    public void keyTyped(KeyEvent ke) {

        ke.setKeyCode(KeyEvent.VK_RIGHT);
       if (ke.getKeyCode() == KeyEvent.VK_RIGHT) {

            String arrNum = tf5.getText();
            ArrayList arList = new ArrayList();
            arList.add(arrNum);
            myPairAryStr.setFirst(arList);
            myTextArea.append(myPairAryStr.getFirst() + "\n");
            tf5.setText("");
       }
    }

    @Override
    public void keyPressed(KeyEvent ke) {
    }

    @Override
    public void keyReleased(KeyEvent ke) {
    }
}

private class ArrayListClickAdd implements ActionListener {

    public ArrayListClickAdd() {
    }

    @Override
    public void actionPerformed(ActionEvent ae) {

        String arrNum = tf5.getText();
        ArrayList arList = new ArrayList();
        arList.add(arrNum);
        myPairAryStr.setFirst(arList);
        myTextArea.append(myPairAryStr.getFirst() + "\n");
        tf5.setText("");
    }
}

private class ButtonClick implements ActionListener {

    public ButtonClick() {
    }

    @Override
    public void actionPerformed(ActionEvent ae) {


        int num = Integer.parseInt(tf1.getText());
        int num2 = Integer.parseInt(tf2.getText());
        String num3 = tf3.getText();
        double num4 = Double.parseDouble(tf4.getText());
        String arrLst = tf5.getText();
        String num6 = tf6.getText();

        int count1 = sumNums(num);
        int count2 = sumNums(num2);
        String strSum = getAsciiSum(num3);
        String goBig = upper(num6);


        Integer int1 = new Integer(count1);
        Integer int2 = new Integer(count2);
        String str1 = strSum;
        Double dbl2 = new Double(num4);
        ArrayList arList = new ArrayList();
        arList.add(arrLst);
        String str2 = goBig;

        myPairInt.setFirst(int1);
        myPairInt.setSecond(int2);
        myPairStrDbl.setFirst(str1);
        myPairStrDbl.setSecond(dbl2);
        myPairAryStr.setFirst(arList);
        myPairAryStr.setSecond(str2);

        lbl3.setText("Your numbers fromthe first field add up to : " + myPairInt.getFirst() + " and your numbers from the second field add up to : " + myPairInt.getSecond());
        lbl6.setText("The Ascii sum of the first Field is : " + myPairStrDbl.getFirst() + " and you typed : " + myPairStrDbl.getSecond() + " In the Second Field");
        lbl9.setText("You typed : " + myPairAryStr.getFirst() + " In the first Field,");
        lbl10.setText("and : " + myPairAryStr.getSecond() + " In the Second");
        myTextArea.append(myPairAryStr.getFirst() + "\n");

    }
}

public static void main(String[] args) {
    Lab10 test = new Lab10();
}

}

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2 回答 2

2

首先看一下如何使用文本字段。

基本上，您想在文本字段上注册一个with，每当用户按下键ActionListener时都会收到通知Enter

查看如何编写动作侦听器以获取更多详细信息。

您应该避免KeyListener使用 s，使用 aDocumentListener来监视对基础文档的更改，或者DocumentFilter如果您想过滤正在输入的内容。有关更多详细信息，请参阅使用文本组件

于 2013-10-30T08:33:02.693 回答
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不要ArrayList在每个 keyTyped 上重新创建。为 ArrayList 创建类的字段，然后在列表中添加值。

ENTER按下时将 的内容发送ArrayList到文本区域并重新创建它。

于 2013-10-30T08:32:50.830 回答