小编Kir*_*ril的帖子

我有点卡住了.当我按下按钮时,提交应该重新显示JLabel图像在同一位置的另一张图片,所以如果有人有任何想法我会很感激他们我正在使用eclipse并且该程序正在编译和运行.这是代码

/** Here is the GUI of the program
 * class name SlideShowGui.java
 * @author Kiril Anastasov
 * @date 07/03/2012
 */

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;   

public class SlideShowGui extends JPanel  implements ActionListener
{
    JLabel name, comments, images;
    JTextField namejtf, commentsjtf, captionjtf;
    JButton submit;
    ImageIcon pictures;


    SlideShowGui()
    {


        name = new JLabel("Name:");
        this.add(name);

        namejtf = new JTextField(15);
        this.add(namejtf);

        comments = new JLabel("Comments:");
        this.add(comments);

        commentsjtf = new JTextField(15);
        this.add(commentsjtf);

        submit = new JButton("Submit");
        this.add(submit);
        submit.addActionListener(this);


        pictures = new …

我正在尝试重置JLabel数组.标签顶部有图像,所以当我按下按钮时,标签应该被重置.我试着这样做

 for(int i=0; i<desks.length; i++)
  {
    desks[i].setText("");
    rightPanel.add(desks[i]);
  }

所以,如果有人有一个想法,那将是伟大的.

大家好,我在这里有点堆叠.当我运行程序并按下提交按钮时,它应该每2秒更换4张图片.但是它不会重新显示图像.如果有人能帮我一把,那就太好了.我正在使用eclipse,程序正在编译和运行.这是代码.

/** Here is the GUI of the program
 * class name SlideShowGui.java
 * @author Kiril Anastasov
 * @date 07/03/2012
 */

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;   

public class SlideShowGui extends JPanel  implements ActionListener, Runnable
{
    JLabel name, comments, images;
    JTextField namejtf, commentsjtf, captionjtf;
    JButton submit;
    ImageIcon pictures1, pictures2, pictures3, pictures4;
    //ImageIcon []pictures2 = {galileo1.jpg};


    SlideShowGui()
    {


        name = new JLabel("Name:");
        this.add(name);

        namejtf = new JTextField(15);
        this.add(namejtf);

        comments = new JLabel("Comments:");
        this.add(comments);

        commentsjtf = new JTextField(15);
        this.add(commentsjtf);

        submit …

按下勾选按钮时出现运行错误.我正在尝试使用javax.swing.Timer按下勾选按钮来触发事件所以如果有人有任何建议我会很感激他们.我目前正在使用Eclipse,按下勾选按钮时会出现运行时错误.

线程"AWT-EventQueue-0"中的异常java.lang.Error:未解决的编译问题:类型ClockPanel必须在ClockPanel.actionPerformed(ClockPanel.java:10)实现继承的抽象方法ActionListener.actionPerformed(ActionEvent)

这是我正在使用的代码(3个类).

import java.util.Calendar;
import java.util.GregorianCalendar;

class Clock 
{
     int hour;
     int minute;
     int second;

     Calendar gregcal = new GregorianCalendar();
     int h = gregcal.get(Calendar.HOUR_OF_DAY);
     int m = gregcal.get(Calendar.MINUTE);
     int s = gregcal.get(Calendar.SECOND);

    //default constructor
    Clock()
    {
        hour = h;
        minute = m;
        second = s; 
    }

    //parameterized constructor
    Clock(int hour, int minute, int second)
    {
        this.hour = hour;
        this.minute = minute;
        this.second = second;      
    }

    public int getHour()
    {
        return hour;
    }

    public int getMinute()
    {
        return minute;
    } …

嗨伙计们,当点击提交按钮时,我开始增加,当它是2时,我希望它改变图片,当我是4我想要改变到另一张图片但它没有这样做,所以如果有人有想法它会是大.我正在使用eclipse,程序正在编译和运行.这是代码

/** Here is the GUI of the program
 * class name SlideShowGui.java
 * @author Kiril Anastasov
 * @date 07/03/2012
 */

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;   

public class SlideShowGui extends JPanel  implements ActionListener, Runnable
{
    JLabel name, comments, images;
    JTextField namejtf, commentsjtf, captionjtf;
    JButton submit;
    ImageIcon pictures;


    SlideShowGui()
    {


        name = new JLabel("Name:");
        this.add(name);

        namejtf = new JTextField(15);
        this.add(namejtf);

        comments = new JLabel("Comments:");
        this.add(comments);

        commentsjtf = new JTextField(15);
        this.add(commentsjtf);

        submit = new JButton("Submit");
        this.add(submit);
        submit.addActionListener(this);


        pictures = …

我通过SimpleDateFormat得到当前时间,我希望返回6小时30分钟前的新时间.我尝试用Calendar做它,但是如果它们小于30,它会返回负值.所以我的问题是,如果可以在需要从小时或天数借用时返回正确的数字.这是代码.我使用eclipse,程序正在编译和运行.

import java.text.DateFormat;
import java.text.NumberFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;


public class DifferenceInHours_04 
{

    public static void main(String[] args) 
    {
        Date date = new Date();
        SimpleDateFormat sdf = new SimpleDateFormat("dd MMM yyyy hh:mm:ss zzz" );
        System.out.println(sdf.format(date));

        Calendar cal = Calendar.getInstance();
        int hour = cal.get(Calendar.HOUR);
        int minute = cal.get(Calendar.MINUTE );
        int second = cal.get(Calendar.SECOND);
        System.out.println("Current time: "  + hour + ":" + minute +":" + second);

        int newHour = hour - 6;
        int newMinute = minute …