java计算器小程序.doc

编写一个简易的聊天器程序，至少提供一个聊天内容显示文本域和一个发送消息的文本框界面，要求实现在发送信息框内填写内容并按下回车后，把该内容添加到上面的文本域内。package com;import java.awt.FlowLayout;import java.awt.LayoutManager;import java.awt.event.FocusEvent;import java.awt.event.FocusListener;import java.awt.event.KeyAdapter;import java.awt.event.KeyEvent;import javax.swing.*;public class Ltsdemo extends JFrame implements FocusListenerstatic final int f=300;static final int s=300;JLabel l1,l2;JTextArea t1;JTextField t2;JPanel jp1,jp2,jp3;Ltsdemo()super(聊天室程序);jp1=new JPanel();jp2=new JPanel();l1=new JLabel(接收消息);t1=new JTextArea(4,20);JScrollPane s2=new JScrollPane(t1,ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS,ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);s2.addFocusListener(this);jp1.add(l1);jp1.add(s2);l2=new JLabel(输入消息);t2=new JTextField(发送内容,20);t2.addFocusListener(this);t2.addKeyListener(new KeyAdapter()public void keyPressed(KeyEvent e)if(e.getKeyChar()=n)t1.setText(t1.getText()+n+t2.getText();t2.setText();/文本框清空);jp2.add(l2);jp2.add(t2); FlowLayout f1=new FlowLayout();this.setLayout(f1);this.add(jp1);this.add(jp2);setSize(f,s);setDefaultCloseOperation(EXIT_ON_CLOSE);setVisible(true);public static void main(String args)Ltsdemo s1=new Ltsdemo();public void focusGained(FocusEvent e) if(e.getComponent()=t2)t2.setText();/清空文本域；public void focusLost(FocusEvent e) if(e.getComponent()=t2)t2.setText(发送消息);/清空文本域；package COM;import java.awt.FlowLayout;import java.awt.event.FocusEvent;import java.awt.event.FocusListener;import java.awt.event.KeyAdapter;import java.awt.event.KeyEvent;import javax.swing.*;public class Lts extends JFrame implements FocusListenerJLabel s1,s2,s3;JTextField t1,t2,t3;JTextArea a1;JButton w1, w2;JPanel jp,jp1,jp2,jp3;Lts(String Title)setTitle(聊天室-客户端程序);jp=new JPanel();s1=new JLabel(服务器:);t1=new JTextField(127.0.0.1,20);w1=new JButton( 退出 );jp.add(s1);jp.add(t1);jp.add(w1);s2=new JLabel(端口号:);t2=new JTextField(2000,20);w2=new JButton( 退出 );jp1=new JPanel();jp1.add(s2);jp1.add(t2);jp1.add(w2);jp2=new JPanel();a1=new JTextArea(客户端服务器 2008-8-19 11：36：26 n连接完成 n服务器 2008-8-19 11：36：33 nabc n ,4,7);jp2.add(a1);jp3=new JPanel();s3=new JLabel( 发送 );t3=new JTextField(20);t3.addFocusListener(this);t3.addKeyListener(new KeyAdapter()public void keyPressed(KeyEvent e)if(e.getKeyChar()=n)a1.setText(a1.getText()+n+t3.getText();t3.setText();/文本框清空);jp3.add(s3);jp3.add(t3);FlowLayout f1=new FlowLayout();setLayout(f1);add(jp);add(jp1);add(jp2);add(jp3);setSize(400,400);setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);setVisible(true);public static void main(String args)Lts ss=new Lts( );public void focusGained(FocusEvent e) if(e.getComponent()=t2)t2.setText();/清空文本域；public void focusLost(FocusEvent e) if(e.getComponent()=t2)t2.setText(发送消息);/清空文本域；package sex;import java.awt.*;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.*;public class Jsqdemo extends JFrame implements ActionListenerJPanel jp,jp1,jp2,jp3,jp4,jp5;JLabel l1;JTextField t1;JButton k1,k2,k3,w1,w2,w3,w4,w5,w6,w7,w8,w9,w10,w11,w12,w13,w14,w15,w16,w17,w18,w19,w20;String s1,s2,s;Jsqdemo()super(计算器);jp=new JPanel();jp1=new JPanel();jp2=new JPanel();jp3=new JPanel();jp4=new JPanel();jp5=new JPanel();l1=new JLabel( 计算结果: );t1=new JTextField(40);jp.setLayout(new GridLayout(1,2);jp.add(l1);jp.add(t1);k1=new JButton( Java );k2=new JButton( Backspack );k3=new JButton(CE);k3.addActionListener(this);jp1.setLayout(new GridLayout(1,3);jp1.add(k1);jp1.add(k2);jp1.add(k3);/jp1.setLayout(new GridLayout(1,3);w1=new JButton(7);w1.addActionListener(this);w2=new JButton(8);w2.addActionListener(this);w3=new JButton(9);w3.addActionListener(this);w4=new JButton(/);w4.addActionListener(this);w5=new JButton(sqrt);w5.addActionListener(this);jp2.setLayout(new GridLayout(1,5);jp2.add(w1);jp2.add(w2);jp2.add(w3);jp2.add(w4);jp2.add(w5);w6=new JButton(4);w6.addActionListener(this);w7=new JButton(5);w7.addActionListener(this);w8=new JButton(6);w8.addActionListener(this);w9=new JButton(*);w9.addActionListener(this);w10=new JButton(%);w10.addActionListener(this);jp3.setLayout(new GridLayout(1,5);jp3.add(w6);jp3.add(w7);jp3.add(w8);jp3.add(w9);jp3.add(w10);w11=new JButton(1);w11.addActionListener(this);w12=new JButton(2);w12.addActionListener(this);w13=new JButton(3);w13.addActionListener(this);w14=new JButton(-);w14.addActionListener(this);w15=new JButton(sin);w15.addActionListener(this);jp4.setLayout(new GridLayout(1,5);jp4.add(w11);jp4.add(w12);jp4.add(w13);jp4.add(w14);jp4.add(w15);w16=new JButton(0);w16.addActionListener(this);w17=new JButton(cos);w17.addActionListener(this);w18=new JButton(.);w18.addActionListener(this);w19=new JButton(+);w19.addActionListener(this);w20=new JButton(=);w20.addActionListener(this);jp5.setLayout(new GridLayout(1,5);jp5.add(w16);jp5.add(w17);jp5.add(w18);jp5.add(w19);jp5.add(w20);this.setLayout(new GridLayout(6,1);this.add(jp);this.add(jp1);this.add(jp2);this.add(jp3);this.add(jp4);this.add(jp5);this.setBounds(200,200,300,300);this.setDefaultCloseOperation(EXIT_ON_CLOSE);this.setVisible(true);/监测各个按钮public void actionPerformed(ActionEvent event)String str=event.getActionCommand();if(str.equals(.)t1.setText(t1.getText()+.);else if(str.equals(0)t1.setText(t1.getText()+0);else if(str.equals(1)t1.setText(t1.getText()+1);else if(str.equals(2)t1.setText(t1.getText()+2);else if(str.equals(3)t1.setText(t1.getText()+3);else if(str.equals(4)t1.setText(t1.getText()+4);else if(str.equals(5)t1.setText(t1.getText()+5);else if(str.equals(6)t1.setText(t1.getText()+6);else if(str.equals(7)t1.setText(t1.getText()+7);else if(str.equals(8)t1.setText(t1.getText()+8);else if(str.equals(9)t1.setText(t1.getText()+9);else if(str.equals(CE)t1.setText();if(str.equals(sqrt)s1=t1.getText();double d1=Double.parseDouble(s1);t1.setText(+Math.sqrt(d1);if(str.equals(sin)s1=t1.getText();double d1=Double.parseDouble(s1);d1=d1*Math.PI/180;t1.setText(+Math.sin(d1);if(str.equals(cos)s1=t1.getText();double d1=Double.parseDouble(s1);d1=d1*Ma