The import javax.swing is never used

The import javax.swing is never used import javax.swing.import javax.swing.event. import javax.swing.*;的javax是什么意思 import javax.swing.JToolBar是什么 import javax.swing.JScrollPane是什么 new Address[]()那里报The left-hand side of an assignment must be a variable错误、package com.sxt.mail;import java.util.Properties;import javax.mail.Address;import javax.mail.Message;import javax.mail.Session;import javax.mail.Transport;import j 求解释import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.event.*; servletpackage servlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.RequestDispatcher;import javax.servlet.ServletException;import java.io.*;impo JAVAEclipse:could not find the main class,program will exit!我在Eclipse中写了以下一个程序：import java.awt.*;import javax.swing.*;import javax.swing.tree.*;import javax.swing.event.*;//森林状的关系图public class JTreeDemoextends JF import javax.swing.*; import java.awt.*; import java.awt.event.*; import java.sql.*; public class a java 中import javax.swing.JOptionPane;什么意思 java语句注释,解释什么意思,急等着用,谢谢package com.tsinghua.servlet;import java.io.IOException;import java.util.List;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequ 要详细点的哈 我是新手 不太懂哦// Java core packagesimport java.awt.*;import java.awt.event.*;import java.awt.geom.*;import java.util.*;// Java extension packagesimport javax.swing.*;import javax.swing.BorderFactory;import javax.swing.ev java一个小错误,帮忙看下啊,超级感谢import java.awt.*;import java.awt.event.*;import javax.swing.*;import javax.swing.event.CaretEvent;import javax.swing.event.CaretListener;public class NumberFrame extends JFrame implements CaretListener 英语翻译import java.awt.*;import java.awt.event.*;import javax.swing.*;import javax.swing.border.*;import java.util.Vector;import java.net.*;import java.io.*;class FindFriend2 extends JFrame {//查找好友类JLabel jLabel1 = new JLabel();JButton 有没有哪个好心人可以帮我运行一下这个JAVA程序?告诉我运行的结果是什么样.import java.awt.*;import java.awt.event.*;import javax.swing.*;import javax.swing.border.*;public class GRIDRAWING{public static void main(String ar import java.awt.*; import java.awt.event.*; import javax.swing.*;为什么写JAVA程序总是要写上这些东西?可以不写上吗?不写上会怎样? java题目要求我们按left排布就按从做向右排布,按center排布就按从中间排布,按right就按从右向左排布!import java.awt.*;import java.awt.event.*;import javax.swing.*;import javax.swing.JButton;import javax.swing.JFrame;impo