javaapplet做一个java applet程序

如何编写一个java applet

import java.applet.*; import javax.swing.*; import java.awt.*; import java.awt.event.*; public class jj extends Applet //implements ActionListener { JLabel l1; JLabel l2; JTextField t1; JTextField t2; JButton button; public void init() { resize(1000,70); l1=new JLabel("请输入单词："); t1=new JTextField(10); l1=new JLabel("大写的单词为："); t2=new JTextField(10); button=new JButton("大写"); l1.setFont(new Font("宋体",Font.BOLD,30)); l1.setForeground(Color.green); t1.setFont(new Font("宋体",Font.BOLD,30)); t1.setForeground(Color.black); t2.setFont(new Font("宋体",Font.BOLD,30)); t2.setForeground(Color.blue); button.setFont(new Font("宋体",Font.BOLD,30)); button.setForeground(Color.black); l2.setFont(new Font("宋体",Font.BOLD,30)); l2.setForeground(Color.red);// btn.addActionListener(this); this.add(l1); this.add(t1); this.add(button); this.add(l2); this.add(t2); button.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { if(e.getSource()==button) { String str=t1.getText().toUpperCase(); t2.setText(str); } } }); }}

编写java applet 程序

随便写了个 功能实现了 public class Trapezoidal { private double upWeight; private double height; private double downWeight; public Trapezoidal(double upWeight,double height,double downWeight){ setHeight(height); setDownWeight(downWeight); setUpWeight(upWeight); } public double getUpWeight() { return upWeight; } public void setUpWeight(double upWeight) { this.upWeight = upWeight; } public double getHeight() { return height; } public void setHeight(double height) { this.height = height; } public double getDownWeight() { return downWeight; } public void setDownWeight(double downWeight) { this.downWeight = downWeight; } public String count(){ return Double.toString((getDownWeight()+getUpWeight())*getHeight()/2); } } import java.awt.GridLayout; 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.JPanel; import javax.swing.JTextField; .sun.xml.internal.fastinfoset.algorithm.IEEE754FloatingPointEncodingAlgorithm; public class TestApp extends JFrame{ private JFrame jf = new JFrame(); private JPanel jp = new JPanel(); private JLabel jl1,jl2,jl3; private JButton jb1; private JTextField jtf1,jtf2,jtf3,jtf4; public TestApp(){ jl1 = new JLabel("上底"); jl2 = new JLabel("下底"); jl3 = new JLabel("高"); jtf1 = new JTextField(); jtf2 = new JTextField(); jtf3 = new JTextField(); jtf4 = new JTextField("结果"); jb1 = new JButton("计算"); jp.setLayout(new GridLayout(4, 2)); jp.add(jl1); jp.add(jtf1); jp.add(jl2); jp.add(jtf2); jp.add(jl3); jp.add(jtf3); jp.add(jb1); jp.add(jtf4); jf.add(jp); jf.setVisible(true); jf.setSize(400, 300); jb1.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { // TODO Auto-generated method stub double str1 = Double.valueOf(jtf1.getText()); double str2 = Double.valueOf(jtf2.getText()); double str3 = Double.valueOf(jtf3.getText()); jtf4.setText(new Trapezoidal(str1, str3, str2).count()); System.out.println(new Trapezoidal(str1, str3, str2).count()); } }); } public static void main(String[] args) { // TODO Auto-generated method stub TestApp ta = new TestApp(); } }

做一个java applet程序

import java.awt.*; import java.applet.*; public class ComplexNumber { double m_dRealPart; double m_dImaginPart; public ComplexNumber() { this(0, 0); } public ComplexNumber(double r, double i) { m_dRealPart = r; m_dImaginPart = i; } public double getRealPart() { return m_dRealPart; } public void setRealPart() { this.m_dRealPart = m_dRealPart; } public double getImaginaryPart() { return m_dImaginPart; } public void setImaginaryPart(double m_dImaginPart) { this.m_dImaginPart = m_dImaginPart; } public plexAdd(double c) { plexAdd(new ComplexNumber(c, 0)); } public plexAdd(ComplexNumber c) { m_dRealPart += c.getRealPart(); m_dImaginPart += c.getImaginaryPart(); return this; } public plexMinus(double c) { plexMinus(new ComplexNumber(c, 0)); } public plexMinus(ComplexNumber c) { m_dRealPart -= c.getRealPart(); m_dImaginPart -= c.getImaginaryPart(); return this; } public plexMulti(double c) { plexMulti(new ComplexNumber(c, 0)); } public plexMulti(ComplexNumber c) { double r = m_dRealPart * c.getRealPart() - m_dImaginPart * c.getImaginaryPart(); double i = m_dImaginPart * c.getRealPart() + m_dRealPart * c.getImaginaryPart(); m_dRealPart = r; m_dImaginPart = i; return this; } public String toString() { String res = m_dRealPart + ""; if(m_dImaginPart != 0) { res += "+" + m_dImaginPart + "i"; } return res; } } 请参考