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前言：
来看这篇教程估计都是java课程设计吧，现在已经没有公司很少使用swing组件了，java主要还是开发Web方面，可以了解以下swing组件仅此而已。我们这是一个组做的课程设计，一共写了三个：window画板，解码器，计算器，我只写了计算器，所以我将计算器的代码单独发布
主函数
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
class menu_li001 {
public static void main(String[] args) {
menu_li002 li = new menu_li002();
li.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
li.setVisible(true);
li.pack();
li.setSize(600,100);
}
}
class menu_li002 extends JFrame{
static int i;
public menu_li002(){
TextField f1 = new TextField(24);
new Box(BoxLayout.X_AXIS);
JPanel card=new JPanel();
CardLayout Clayout=new CardLayout();
JPanel mi = new JPanel();
JRadioButton choose02 = new JRadioButton("计算器");
JLabel calculter =new JLabel(new ImageIcon("src/calculter.jpg"));
Box h = Box.createHorizontalBox();
Box h1 = Box.createHorizontalBox();
Box vbox = Box.createVerticalBox();
ButtonGroup bg1 = new ButtonGroup();
ButtonGroup bg2 = new ButtonGroup();
ButtonGroup bg3 = new ButtonGroup();
bg2.add(choose02);
h.add(choose02);
h1.add(f1);
vbox.add(h);
vbox.add(h1);
setContentPane(vbox);
mi.add(h);
mi.add(h1);
card.add(mi);
add(card);
choose02.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
f1.setText("你选中:" + choose02.getText());
add(BorderLayout.SOUTH,calculter);
//contentPane.add(calculter);
CacultorL window=new CacultorL();
window.setSize(500,300);
window.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
window.pack();
window.setJMenuBar(CacultorL.menuBar);
window.setVisible(true);
bg1.clearSelection();
bg3.clearSelection();
}
});
}
}
打开界面如下图：
普通计数器
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.*;
public class CacultorL extends JFrame implements ActionListener{
JPanel cards;
CardLayout Clayout=new CardLayout();
JPanel cardNorth;
private final String keys[]={"%","√","x^2","1/x","CE","C","<-","/","7","8","9","*","4","5","6","-","1","2","3","+","+/-","0",".","="};
private final String Rom[]={"MC","MR","M+","M-","MS","M"};
private JButton Keys[]=new JButton[keys.length];
private JButton rom[]=new JButton[Rom.length];
static JMenuBar menuBar=new JMenuBar();
JPanel CenterPanel=new JPanel();
JPanel NorthPanel=new JPanel();
JPanel SouthPanel=new JPanel();
JTextField textField=new JTextField(17);
JTextField textFieldUp=new JTextField(17);
private double left;
private double right;
private static double result;
private String Result;
private String temp="";
private static int option;
private static String temp1="";
private static int option1=0;
private static double right1;
public static void main(String[] args) throws IOException {
CacultorL window=new CacultorL();
window.setSize(500,300);
window.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
window.pack();
window.setVisible(true);
DataOutputStream dataOutputStream=new DataOutputStream(new FileOutputStream("src/a.dat"));
dataOutputStream.writeDouble(result);
}
public CacultorL() {
// File Datap=new File("DataIn.txt");
// FileWriter in=new FileWriter(Datap);
JMenu fileItem=new JMenu(" 功能菜单");
JMenuItem card1=new JMenuItem(" 科学");
// JMenuItem card2=new JMenuItem(" 标准");
menuBar.add(fileItem);
fileItem.add(card1);
// fileItem.add(card2);
cards=new JPanel();
cards.setLayout(Clayout);
cardNorth=new JPanel();
cardNorth.setLayout(Clayout);
SouthPanel.setLayout(new GridLayout(2,1));
CenterPanel.setLayout(new GridLayout(6,4));
NorthPanel.setLayout(new GridLayout(1,6));
CenterPanel.setPreferredSize(new Dimension(250,150));
NorthPanel.setPreferredSize(new Dimension(350,70));
addRom(Rom);
for(int i=0;i<keys.length;i++) {
addKeys(keys[i],i);
}
SouthPanel.add(textFieldUp);
SouthPanel.add(textField);
add(SouthPanel,BorderLayout.NORTH);
Kcacultor a=new Kcacultor();
// add(a.center1,BorderLayout.SOUTH);
add(NorthPanel,BorderLayout.CENTER);
cards.add(CenterPanel);
cards.add(a.center1);
cardNorth.add(SouthPanel);
cardNorth.add(a.NorthPanel);
//Kcacultor.center1.setBackground(Color.BLACK);
add(BorderLayout.SOUTH,cards);
add(BorderLayout.NORTH,cardNorth);
textField.setHorizontalAlignment(JTextField.RIGHT);
textField.setEditable(false);
textFieldUp.setHorizontalAlignment(JTextField.RIGHT);
textFieldUp.setEditable(false);
card1.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
Clayout.next(cards);
Clayout.next(cardNorth);
textField.setText("");
textFieldUp.setText("");
temp="";
temp1="";
left=0;
right=0;
}
});
}
public void addKeys(String keys,int i){
Keys[i]= new JButton(keys);
CenterPanel.add(Keys[i]);
Keys[i].addActionListener(this);
}
public void addRom(String Rom[]){
for(int i=0;i<Rom.length;i++){
rom[i]= new JButton(Rom[i]);
NorthPanel.add(rom[i]);
}
}
@Override
public void actionPerformed(ActionEvent e) {
if(e.getSource()==Keys[8]){
temp+="7";
temp1+="7";
textField.setText(temp);
}else if(e.getSource()==Keys[9]){
temp1+="8";
temp+="8";
textField.setText(temp);
}else if(e.getSource()==Keys[10]){
temp1+="9";
temp+="9";
textField.setText(temp);
}else if(e.getSource()==Keys[12]){
temp1+="4";
temp+="4";
textField.setText(temp);
}else if(e.getSource()==Keys[13]){
temp1+="5";
temp+="5";
textField.setText(temp);
}else if(e.getSource()==Keys[14]){
temp1+="6";
temp+="6";
textField.setText(temp);
}else if(e.getSource()==Keys[16]){
temp1+="1";
temp+="1";
textField.setText(temp);
}
else if(e.getSource()==Keys[17]){
temp1+="2";
temp+="2";
textField.setText(temp);
}
else if(e.getSource()==Keys[18]){
temp1+="3";
temp+="3";
textField.setText(temp);
}else if(e.getSource()==Keys[21]){
temp1+="0";
temp+="0";
textField.setText(temp);
}
if(e.getSource()==Keys[0]){
left=Double.parseDouble(textField.getText());
textField.setText("");
temp="";
temp1+="%";
textFieldUp.setText(temp1);
option=2;
option1=0;
}else if(e.getSource()==Keys[23]){
option1++;
if(option==1){
String Right=textField.getText();
right=Double.parseDouble(Right);
result=left+right;
Result=""+result;
if(option1>1){
result=left+right1;
}
Result=""+result;
left=result;
}else if (option==2){
right=Double.parseDouble(textField.getText());
result=left%right;
Result=""+result;
}else if(option==3){
if(option1==1) {
right = Double.parseDouble(textField.getText());
result = left / right;
right1=right;
}
if(option1>1){
result=left/right1;
}
Result=""+result;
left=result;
}else if(option==4){
right=Double.parseDouble(textField.getText());
result=left*right;
Result=""+result;
if(option1>1){
result=left*right1;
}
Result=""+result;
left=result;
}else if(option==5){
if(option1==1) {
right = Double.parseDouble(textField.getText());
result = left - right;
right1=right;
}
if(option1>1){
result=left-right1;
}
Result=""+result;
left=result;
}
try {
DataOutputStream dataOutputStream = new DataOutputStream(new FileOutputStream("src/a.dat"));
dataOutputStream.writeDouble(result);
//byte[] buffer = new byte[1024];
//dataOutputStream.write(buffer,0,8);
dataOutputStream.close();
} catch (Exception e1) {
e1.printStackTrace();
}
textField.setText(Result);
}else if (e.getSource()==Keys[1]){
left=Double.parseDouble(textField.getText());
textField.setText("");
temp="";
result=Math.sqrt(left);
Result=""+result;
temp1="√("+temp1+"）";
textField.setText(Result);
textFieldUp.setText(temp1);
}else if(e.getSource()==Keys[2]){
left=Double.parseDouble(textField.getText());
textField.setText("");
temp="";
result=left*left;
temp1="sqr("+temp1+"）";
Result=""+result;
textField.setText(Result);
textFieldUp.setText(temp1);
left=result;
}else if(e.getSource()==Keys[3]){
left=Double.parseDouble(textField.getText());
textField.setText("");
temp="";
result=1/left;
Result=""+result;
textFieldUp.setText(Result);
}else if(e.getSource()==Keys[4]){
textField.setText("");
temp="";
temp1="";
left=0;
right=0;
}else if(e.getSource()==Keys[19]){
left=Double.parseDouble(textField.getText());
temp1+="+";
textFieldUp.setText(temp1);
textField.setText("");
temp="";
option=1;
option1=0;
}else if(e.getSource()==Keys[5]){
textField.setText("");
textFieldUp.setText("");
temp="";
temp1="";
}else if(e.getSource()==Keys[7]){
left=Double.parseDouble(textField.getText());
temp1+="/";
textFieldUp.setText(temp1);
textField.setText("");
temp="";
option=3;
option1=0;
}else if(e.getSource()==Keys[11]){
left=Double.parseDouble(textField.getText());
temp1+="*";
textFieldUp.setText(temp1);
textField.setText("");
temp="";
option=4;
option1=0;
}else if(e.getSource()==Keys[15]){
left=Double.parseDouble(textField.getText());
temp1+="-";
textFieldUp.setText(temp1);
textField.setText("");
temp="";
option=5;
option1=0;
}else if(e.getSource()==Keys[22]){
temp1+=".";
temp+=".";
textField.setText(temp);
}else if(e.getSource()==Keys[6]){
temp1=textField.getText();
temp1=temp1.substring(0,temp1.length()-1);
temp=temp1;
textField.setText(temp1);
}else if(e.getSource()==Keys[20]){
right=Double.parseDouble(textField.getText());
right=-right;
Result=""+right;
textField.setText(Result);
temp1=temp1.substring(0,temp1.length()-2);
temp1+=textField.getText();
}
}
}
界面如下：
科学计算器
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class Kcacultor extends JFrame implements ActionListener{
JPanel card=new JPanel();
CardLayout ClayoutNext=new CardLayout();
JPanel CenterPanelk1=new JPanel();
JPanel CenterPanelK2=new JPanel();
JPanel SouthPanel=new JPanel();
JPanel center1=new JPanel();
private double left;
private double right;
private String temp="";
private String temp1="";
private String Result;
private double result;
private int option1=0;
private int option;
private final String keys1[]={"x^2","x^y","sin","cos","tan","√","10^x","log","Exp","Mod"};
private final String keys2[]={"x^3","y√x","arcsin","arccos","arctan","1/x","e^x","In","dms","deg"};
private final String keys3[]={"↑","CE","C","<-","/","Π","7","8","9","*","n!","4","5","6","-","+/-","1","2","3","+","(",")","0",".","="};
private JButton Keys1[]=new JButton[keys1.length];
private JButton Keys2[]=new JButton[keys2.length];
private JButton Keyscenter[]=new JButton[keys3.length];
private static double right1;
JPanel NorthPanel=new JPanel();
JTextField textField=new JTextField(17);
JTextField textFieldUp=new JTextField(17);
// CacultorL b=new CacultorL();
@Override
public void actionPerformed(ActionEvent e) {
if(e.getSource()==Keyscenter[0]){
ClayoutNext.next(card);
}else if(e.getSource()==Keyscenter[6]){
temp+="7";
temp1+="7";
textField.setText(temp);
}else if(e.getSource()==Keyscenter[7]){
temp+="8";
temp1+="8";
textField.setText(temp);
}else if(e.getSource()==Keyscenter[8]){
temp+="9";
temp1+="9";
textField.setText(temp);
}
else if(e.getSource()==Keyscenter[11]){
temp+="4";
temp1+="4";
textField.setText(temp);
}
else if(e.getSource()==Keyscenter[12]){
temp+="5";
temp1+="5";
textField.setText(temp);
}
else if(e.getSource()==Keyscenter[13]){
temp+="6";
temp1+="6";
textField.setText(temp);
}
else if(e.getSource()==Keyscenter[16]){
temp+="1";
temp1+="1";
textField.setText(temp);
}
else if(e.getSource()==Keyscenter[17]){
temp+="2";
temp1+="2";
textField.setText(temp);
}
else if(e.getSource()==Keyscenter[18]){
temp+="3";
temp1+="3";
textField.setText(temp);
}else if(e.getSource()==Keyscenter[24]){
option1++;
if(option==1){
String Right=textField.getText();
right=Double.parseDouble(Right);
result=left+right;
Result=""+result;
if(option1>1){
result=left+right1;
}
Result=""+result;
left=result;
}else if (option==2){
right=Double.parseDouble(textField.getText());
result=left%right;
Result=""+result;
}else if(option==3){
if(option1==1) {
right = Double.parseDouble(textField.getText());
result = left / right;
right1=right;
}
if(option1>1){
result=left/right1;
}
Result=""+result;
left=result;
}else if(option==4){
right=Double.parseDouble(textField.getText());
result=left*right;
Result=""+result;
if(option1>1){
result=left*right1;
}
Result=""+result;
left=result;
}else if(option==5){
if(option1==1) {
right = Double.parseDouble(textField.getText());
result = left - right;
right1=right;
}
if(option1>1){
result=left-right1;
}
Result=""+result;
left=result;
}else if(option==6){
right=Double.parseDouble(textField.getText());
for(int i=0;i<right;i++){
result=left*left;
}
Result=""+result;
left=result;
}else if(option==7){
right=Double.parseDouble(textField.getText());
for (int i=1;i<=right;i++){
left*=10;
}
Result=""+left;
}else if (option==8){
right=Double.parseDouble(textField.getText());
for(int i=0;i<right;i++){
result=Math.sqrt(left);
}
Result=""+result;
}
textField.setText(Result);
}else if (e.getSource()==Keyscenter[4]){
left=Double.parseDouble(textField.getText());
temp1+="/";
textFieldUp.setText(temp1);
textField.setText("");
temp="";
option=3;
option1=0;
}else if (e.getSource()==Keyscenter[14]){
left=Double.parseDouble(textField.getText());
temp1+="-";
textFieldUp.setText(temp1);
textField.setText("");
temp="";
option=5;
option1=0;
}else if (e.getSource()==Keyscenter[19]){
left=Double.parseDouble(textField.getText());
temp1+="+";
textFieldUp.setText(temp1);
textField.setText("");
temp="";
option=1;
option1=0;
}else if (e.getSource()==Keyscenter[9]){
left=Double.parseDouble(textField.getText());
temp1+="*";
textFieldUp.setText(temp1);
textField.setText("");
temp="";
option=4;
option1=0;
}else if(e.getSource()==Keyscenter[1]){
textField.setText("");
temp="";
temp1="";
right=0;
}else if(e.getSource()==Keyscenter[2]){
textField.setText("");
textFieldUp.setText("");
temp="";
temp1="";
}else if(e.getSource()==Keyscenter[3]){
temp1=textField.getText();
temp1=temp1.substring(0,temp1.length()-1);
temp=temp1;
textField.setText(temp1);
}else if(e.getSource()==Keyscenter[5]){
temp+="3.1415926535897";
temp1+="3.1415926535897";
textField.setText(temp);
}else if(e.getSource()==Keyscenter[10]){
try {
left = Double.parseDouble(textField.getText());
result = 1;
for (int i = 1; i <= left; i++) {
result *= i;
}
Result = "" + result;
temp1 = "fact(" + temp1 + ")";
textField.setText(Result);
textFieldUp.setText(temp1);
}catch (Exception p){
textField.setText("溢出");
}
}else if(e.getSource()==Keyscenter[15]){
right=Double.parseDouble(textField.getText());
right=-right;
Result=""+right;
textField.setText(Result);
temp1=temp1.substring(0,temp1.length()-2);
temp1+=textField.getText();
}else if(e.getSource()==Keyscenter[23]){
temp1+=".";
temp+=".";
textField.setText(temp);
}
else if (e.getSource()==Keys1[0]){
left=Double.parseDouble(textField.getText());
//textField.setText("");
temp="";
result=left*left;
temp1="sqr("+temp1+"）";
Result=""+result;
left=result;
textField.setText(Result);
textFieldUp.setText(temp1);
}else if (e.getSource()==Keys1[5]){
left=Double.parseDouble(textField.getText());
textField.setText("");
temp="";
result=Math.sqrt(left);
Result=""+result;
temp1="√("+temp1+"）";
textField.setText(Result);
textFieldUp.setText(temp1);
}else if (e.getSource()==Keys1[1]){
left=Double.parseDouble(textField.getText());
textField.setText("");
temp="";
temp1+="^";
textFieldUp.setText(temp1);
option=6;
}else if (e.getSource()==Keys1[2]){
left=Double.parseDouble(textField.getText());
textField.setText("");
temp="";
result=Math.sin(left);
Result=""+result;
temp1="sin("+temp1+"）";
textField.setText(Result);
textFieldUp.setText(temp1);
}else if (e.getSource()==Keys1[3]){
left=Double.parseDouble(textField.getText());
textField.setText("");
temp="";
result=Math.cos(left);
Result=""+result;
temp1="cos("+temp1+"）";
textField.setText(Result);
textFieldUp.setText(temp1);
}else if (e.getSource()==Keys1[4]){
left=Double.parseDouble(textField.getText());
textField.setText("");
temp="";
result=Math.tan(left);
Result=""+result;
temp1="tan("+temp1+"）";
textField.setText(Result);
textFieldUp.setText(temp1);
}else if (e.getSource()==Keys1[6]){
left=Double.parseDouble(textField.getText());
textField.setText("");
temp="";
result=1;
temp1="10^"+temp1;
for(int i=0;i<left;i++){
result*=10;
}
Result=""+result;
textField.setText(Result);
textFieldUp.setText(temp1);
}else if (e.getSource()==Keys1[7]){
left=Double.parseDouble(textField.getText());
textField.setText("");
temp="";
result=Math.log(left);
Result=""+result;
temp1="log("+temp1+"）";
textField.setText(Result);
textFieldUp.setText(temp1);
}else if(e.getSource()==Keys1[8]){
left=Double.parseDouble(textField.getText());
textField.setText("");
temp="";
temp1=temp1+"e";
textFieldUp.setText(temp1);
option=7;
}else if(e.getSource()==Keys1[9]){
left=Double.parseDouble(textField.getText());
textField.setText("");
temp="";
temp1+="%";
textFieldUp.setText(temp1);
option=2;
option1=0;
}else if (e.getSource()==Keys2[0]){
left=Double.parseDouble(textField.getText());
//textField.setText("");
temp="";
result=left*left*left;
temp1="cube("+temp1+"）";
Result=""+result;
left=result;
textField.setText(Result);
textFieldUp.setText(temp1);
}else if (e.getSource()==Keys2[1]){
left=Double.parseDouble(textField.getText());
temp="";
temp1=temp1+"yroot";
textFieldUp.setText(temp1);
textField.setText("");
option=8;
}else if (e.getSource()==Keys2[2]){
left=Double.parseDouble(textField.getText());
textField.setText("");
temp="";
result=Math.asin(left);
Result=""+result;
temp1="arcsin("+temp1+"）";
textField.setText(Result);
textFieldUp.setText(temp1);
}else if (e.getSource()==Keys2[3]){
left=Double.parseDouble(textField.getText());
textField.setText("");
temp="";
result=Math.acos(left);
Result=""+result;
temp1="arccos("+temp1+"）";
textField.setText(Result);
textFieldUp.setText(temp1);
}else if (e.getSource()==Keys2[4]){
left=Double.parseDouble(textField.getText());
textField.setText("");
temp="";
result=Math.atan(left);
Result=""+result;
temp1="arctan("+temp1+"）";
textField.setText(Result);
textFieldUp.setText(temp1);
}else if (e.getSource()==Keys2[5]){
left=Double.parseDouble(textField.getText());
textField.setText("");
temp="";
result=1/left;
Result=""+result;
textField.setText(Result);
}else if (e.getSource()==Keys2[6]){
left=Double.parseDouble(textField.getText());
textField.setText("");
temp="";
result=Math.exp(left);
Result=""+result;
temp1="e^"+temp1;
textField.setText(Result);
textFieldUp.setText(temp1);
}else if (e.getSource()==Keys2[7]){
left=Double.parseDouble(textField.getText());
textField.setText("");
temp="";
result=Math.log(left);
Result=""+result;
temp1="In("+temp1+")";
textField.setText(Result);
textFieldUp.setText(temp1);
}else if (e.getSource()==Keys2[8]){
left=Double.parseDouble(textField.getText());
textField.setText("");
temp="";
Result=""+left;
temp1="dms("+temp1+")";
textField.setText(Result);
textFieldUp.setText(temp1);
}else if (e.getSource()==Keys2[9]){
left=Double.parseDouble(textField.getText());
textField.setText("");
temp="";
Result=""+left;
temp1="degrees("+temp1+")";
textField.setText(Result);
textFieldUp.setText(temp1);
}
}
public Kcacultor(){
card=new JPanel();
card.setLayout(ClayoutNext);
NorthPanel.setLayout(new GridLayout(2,1));
CenterPanelk1.setLayout(new GridLayout(2,5));
CenterPanelK2.setLayout(new GridLayout(2,5));
SouthPanel.setLayout(new GridLayout(5,5));
NorthPanel.add(textFieldUp);
NorthPanel.add(textField);
for(int i=0;i<keys1.length;i++) {
addKeys1(keys1[i],i);
}
for(int i=0;i<keys2.length;i++) {
addKeys2(keys2[i],i);
}
for(int i=0;i<keys3.length;i++) {
addKeys3(keys3[i],i);
}
card.add(CenterPanelk1);
card.add(CenterPanelK2);
SouthPanel.setPreferredSize(new Dimension(250,150));
card.setPreferredSize(new Dimension(250,70));
//CenterPanelk1.setBackground(Color.BLACK);
center1.add(card,BorderLayout.CENTER);
center1.add(SouthPanel,BorderLayout.SOUTH);
center1.setLayout(new GridLayout(2,1));
add(center1,BorderLayout.SOUTH);
//add(card,BorderLayout.CENTER);
textField.setHorizontalAlignment(JTextField.RIGHT);
textField.setEditable(false);
textFieldUp.setHorizontalAlignment(JTextField.RIGHT);
textFieldUp.setEditable(false);
}
public void addKeys1(String keys1,int i){
Keys1[i]= new JButton(keys1);
CenterPanelk1.add(Keys1[i]);
Keys1[i].addActionListener(this);
}
public void addKeys2(String keys2,int i){
Keys2[i]= new JButton(keys2);
CenterPanelK2.add(Keys2[i]);
Keys2[i].addActionListener(this);
}
public void addKeys3(String keys3,int i){
Keyscenter[i]= new JButton(keys3);
SouthPanel.add(Keyscenter[i]);
Keyscenter[i].addActionListener(this);
}
}
通过左上角的功能菜单切换
界面如下：
注意：
如果需要单独的计算器，需要在两个计算器中添加两个输出框，我将显示框放在了主函数中。