java实验八.docx

import java.awt.BorderLayout;import java.awt.Font;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.JLabel;import javax.swing.JPanel;import javax.swing.JTextField;import javax.swing.SwingConstants;public class EventFrame extends JFrame JLabel lblDisplay;JTextField txtA,txtB;public EventFrame()lblDisplay = new JLabel();lblDisplay.setText( 0 + 0 = 0);lblDisplay.setHorizontalAlignment(SwingConstants.CENTER);lblDisplay.setFont(new Font(Times New Rome ,Font.BOLD,30);txtA = new JTextField(5);txtB = new JTextField(5);txtA.setFont(new Font(Times New Rome ,Font.BOLD,20);txtB.setFont(new Font(Times New Rome ,Font.BOLD,20);JButton btnAdd = new JButton(Add);btnAdd.setFont(new Font(Times New Rome ,Font.BOLD,20);JPanel pnl = new JPanel();add(lblDisplay);pnl.add(txtA);pnl.add(txtB);pnl.add(btnAdd);add(pnl,BorderLayout.SOUTH);btnAdd.addActionListener(new ActionListener()public void actionPerformed(ActionEvent event) int a = Integer.parseInt(txtA.getText();int b = Integer.parseInt(txtB.getText();lblDisplay.setText(a+ + +b+=+(a+b););setBounds(200,200,400,300);setVisible(true);setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);public static void main(String args) new EventFrame();import java.awt.BorderLayout;import java.awt.Font;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.SwingConstants;public class ThreadFrame extends JFrame int n=100000000;JLabel lblDisplay;JButton btnCalculate;ThreadFrame()lblDisplay=new JLabel();String result =0;lblDisplay.setText(f(n) = +result);lblDisplay.setHorizontalAlignment(SwingConstants.CENTER);lblDisplay.setFont(new Font(Times New Rome,Font.BOLD, 30);btnCalculate=new JButton(Calculate);btnCalculate.setFont(new Font(Times New Rome,Font.BOLD, 20);btnCalculate.setHorizontalAlignment(SwingConstants.CENTER);btnCalculate.addActionListener(new ActionListener()public void actionPerformed(ActionEvent event) btnCalculate.setEnabled(false);btnCalculate.setText(Calculating, please wait .);long result=f(n,0,10);lblDisplay.setText(f(n) = +result);btnCalculate.setEnabled(true);btnCalculate.setText(Calculate again););add(lblDisplay);add(btnCalculate,BorderLayout.SOUTH);setSize(600, 400);setLocation(200, 200);setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);setVisible(true);long f(int n,long start,long end)long result=0;for (int i=0;in;i+)result+=(long)(Math.random()*(end-start)+start);return result;public static void main(String args) new ThreadFrame();import java.awt.Color;import java.awt.Font;import java.awt.Graphics;import java.awt.event.MouseEvent;import java.awt.event.MouseListener;import javax.swing.JFrame;public class GraphicsFrame extends JFrame implements MouseListener Graphics g;public GraphicsFrame() addMouseListener(this);setBounds(100, 100, 600, 400);this.setDefaultCloseOperation(EXIT_ON_CLOSE);setVisible(true);g = getGraphics();public void paint(Graphics g) super.paint(g);g.setColor(Color.red);g.setFont(new Font(宋体,Font.BOLD,30);g.drawString(Java绘图程序！, 170, 100);public static void main(String args) new GraphicsFrame();Overridepublic void mouseClicked(MouseEvent e) if (e.getButton() = MouseEvent.BUTTON1) g.drawRect(e.getX(), e.getY(), 100, 100); else if (e.getButton() = MouseEvent.BUTTON3) g.drawOval(e.getX(), e.getY(), 100, 100);Overridepublic void mousePressed(MouseEvent e) / TODO Auto-generated method stubSystem.out.print(mousePressed);Overridepublic void mouseReleased(MouseEvent e) / TODO Au