Question

第一次在这里用户，所以请耐心等待...我想创建一个代码，询问用户他们想要创建乘法表的行数和列数，但老实说我不知道去哪里从这里......有人可以帮忙吗？我想要一些细节......例如...为此目的在这里创建一个for循环......

抱歉，如果我的代码格式不正确...这就是我到目前为止..正确地要求用户输入多个行和列并显示那些行和列..我想这样做一次用户单击某个交叉点的按钮，将显示答案。

例如：点击时的第一个按钮将显示“1 * 1 = 1”

import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Scanner;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;


public class SquareGrid {

    private int rowCount;
    private int colCount;

    public SquareGrid(int rowCount, int colCount){
        this.rowCount=rowCount;
        this.colCount= colCount;            
    }

    JFrame theFrame;
    JButton[][] buttons;
    JPanel panel;

    private void createAndShowGui(){
        theFrame = new JFrame ("grid");
        buttons = new JButton[rowCount][colCount];
        panel = new JPanel();
        panel.setLayout(new GridLayout(rowCount, colCount));            
        for(int rowCounter = 0; rowCounter < rowCount; rowCounter++)
            for(int colCounter = 0; colCounter < colCount; colCounter++){
                final JButton j = new JButton("not clicked");
                j.setActionCommand((rowCount + 1) * (colCount + 1)  + "");
                j.addActionListener(new ActionListener(){
                    boolean clicked = false;
                    @Override
                    public void actionPerformed(ActionEvent event) {
                        if(clicked == false) clicked = true;
                        else clicked = false;
                        if (clicked) {
                            j.setText(j.getActionCommand());                            
                        }   
                    }
                    });
                String event;
                buttons[rowCounter][colCounter] = j;            
                panel.add(j);
            }
        theFrame.add(panel);
        theFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        theFrame.pack();
        theFrame.setVisible(true);
    }

    public static void main(String[] args){
        Scanner input = new Scanner(System.in);
        System.out.println("Enter number of rows");
        int rowCount=input.nextInt();           
        Scanner input1=new Scanner(System.in);
        System.out.println("Enter number of columns");
        int colCount=input1.nextInt();
        SquareGrid h = new SquareGrid(colCount,rowCount);
        h.createAndShowGui();
    }
}

Answer 1

单击按钮时，您可以通过从事件中获取该按钮来确定单击了哪个按钮：

JButton buttonClicked = (JButton) event.getSource();

现在您需要做的就是在2D按钮阵列中找到此按钮的行和列，并计算乘法。

PS：您甚至不必使用event.getSource()来获取按钮，因为您已经有j变量引用此按钮。

编辑：行和列可从外部变量获得，只需要最终：

for(int rowCounter = 0; rowCounter < rowCount; rowCounter++)
    for(int colCounter = 0; colCounter < colCount; colCounter++){
        final JButton j = new JButton("not clicked");
        final int row = rowCounter;
        final int col = colCounter;

        // now you can use row and col inside your listener.

Answer 2

我想这样做，一旦用户点击某个十字路口的按钮，就会显示答案。

例如：点击时的第一个按钮将显示“1 * 1 = 1”

您可以在循环中设置actionCommand，并且已经从循环计数中完成了乘法。

final JButton j = new JButton("not clicked");
j.setActionCommand((rowCounter + 1) * (colCounter + 1)  + "");

然后使用actionCommand

if (clicked) {
    j.setText(j.getActionCommand());

enter image description here

<强>更新

不确定你改变了什么，但试试这个

import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Scanner;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class SquareGrid {

    private int rowCount;
    private int colCount;

    public SquareGrid(int rowCount, int colCount) {
        this.rowCount = rowCount;
        this.colCount = colCount;

    }
    JFrame theFrame;
    JButton[][] buttons;

    JPanel panel;

    private void createAndShowGui() {
        theFrame = new JFrame("grid");
        buttons = new JButton[rowCount][colCount];
        panel = new JPanel();
        panel.setLayout(new GridLayout(rowCount, colCount));

        for (int rowCounter = 0; rowCounter < rowCount; rowCounter++) {
            for (int colCounter = 0; colCounter < colCount; colCounter++) {
                final JButton j = new JButton("not clicked");
                j.setActionCommand((rowCounter + 1) * (colCounter + 1) + "");
                j.addActionListener(new ActionListener() {
                    boolean clicked = false;

                    @Override
                    public void actionPerformed(ActionEvent event) {
                        if(clicked == false) clicked = true;
                        else clicked = false;

                        if (clicked) {
                            j.setText(j.getActionCommand());

                        } else {
                            j.setText("not clicked");
                        }

                    }
                });
                buttons[rowCounter][colCounter] = j;
                panel.add(j);
                JButton buttonClicked = (j);  //THIS WAS ADDED

            }
        }
        theFrame.add(panel);
        theFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        theFrame.pack();
        theFrame.setVisible(true);

    }

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        System.out.println("Enter number of rows");
        int rowCount = input.nextInt();

        Scanner input1 = new Scanner(System.in);
        System.out.println("Enter number of columns");
        int colCount = input1.nextInt();

        SquareGrid h = new SquareGrid(colCount, rowCount);
        h.createAndShowGui();
    }
}

Answer 3

John Hurley的CS202级ROFL -John Hurley的CS202级ROFL

Java Multiplication表GUI，请帮我前进

3 个答案: