javajba的简单介绍
今天给各位分享javajba的知识，其中也会对进行解释，如果能碰巧解决你现在面临的问题，别忘了关注本站，现在开始吧！
本文目录一览：
- 1、java记事本源代码
- 2、这个java程序如何实现换行？
- 3、用java做文本编译器
- 4、怎么用JAVA编程编写一个计算器？
- 5、Java web中JDBC，DAO，mybatis，springJBA Data有什么异同
- 6、Java语言设计一个计算器！要稍微有点亮点的，比如输出的字是彩色的等，还要有详细的解说．
java记事本源代码
给你个做好了的Java的源程序的记事本，自己看看就行了的，不怎么难的···
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
public class MyNotepad implements ActionListener{
private JFrame frame=new JFrame("新记事本");
private JTextArea jta=new JTextArea();
private String result="";
private boolean flag=true;
private File f;
private JButton jb=new JButton("开始");
private JTextField jtf=new JTextField(15);
private JTextField jt=new JTextField(15);
private JButton jbt=new JButton("替换为");
private JButton jba=new JButton("全部替换");
private Icon ic=new ImageIcon("D:\\java课堂笔记\\GUI\\11.gif");
private String value;
private int start=0;
private JFrame jf=new JFrame("查找");
private JFrame jfc=new JFrame("替换");
@Override
public void actionPerformed(ActionEvent e) {
String comm=e.getActionCommand();
if("新建".equals(comm)){
if(!(frame.getTitle().equals("新记事本"))){
if(!flag){
write();
newNew();
}else{
JFileChooser jfc=new JFileChooser("D:\\java课堂笔记");
int returnVal = jfc.showDialog(null,"保存为");
if(returnVal == JFileChooser.APPROVE_OPTION) {//选择文件后再执行下面的语句，保证了程序的健壮性
f=jfc.getSelectedFile();
flag=false;
write();
}
}
}else if(!(jta.getText().isEmpty())){
JFileChooser jfc=new JFileChooser("D:\\java课堂笔记");
int returnVal = jfc.showDialog(null,"保存为");
if(returnVal == JFileChooser.APPROVE_OPTION) {//选择文件后再执行下面的语句，保证了程序的健壮性
f=jfc.getSelectedFile();
flag=false;
write();
newNew();
}
}else{
newNew();
}
}else if("打开".equals(comm)){
JFileChooser jfc=new JFileChooser("D:\\java课堂笔记");
jfc.setDialogType(JFileChooser.OPEN_DIALOG);
int returnVal = jfc.showOpenDialog(null);
if(returnVal == JFileChooser.APPROVE_OPTION) {//选择文件后再执行下面的语句，保证了程序的健壮性
f=jfc.getSelectedFile();
frame.setTitle(f.getName());
result=read();
flag=false;
value=result;
jta.setText(result);
}
}else if("保存".equals(comm)){
JFileChooser jfc=new JFileChooser("D:\\java课堂笔记");
if(flag){
int returnVal = jfc.showDialog(null,"保存为");
if(returnVal == JFileChooser.APPROVE_OPTION) {//选择文件后再执行下面的语句，保证了程序的健壮性
f=jfc.getSelectedFile();
flag=false;
write();
}
}else{
write();
}
}else if("另存".equals(comm)){
JFileChooser jfc=new JFileChooser("D:\\java课堂笔记");
int returnVal = jfc.showDialog(null,"另存");
if(returnVal == JFileChooser.APPROVE_OPTION) {//选择文件后再执行下面的语句，保证了程序的健壮性
f=jfc.getSelectedFile();
write();
}
}else if("退出".equals(comm)){
System.exit(0);
}else if("撤销".equals(comm)){
jta.setText(value);
}else if("剪切".equals(comm)){
value=jta.getText();
jta.cut();
}else if("复制".equals(comm)){
jta.copy();
}else if("粘贴".equals(comm)){
value=jta.getText();
jta.paste();
}else if("删除".equals(comm)){
value=jta.getText();
jta.replaceSelection(null);
}else if("全选".equals(comm)){
jta.selectAll();
}else if("查找".equals(comm)){
value=jta.getText();
jf.add(jtf,BorderLayout.CENTER);
jf.add(jb,BorderLayout.SOUTH);
jf.setLocation(300,300);
jf.pack();
jf.setVisible(true);
jf.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
}else if("替换".equals(comm)){
value=jta.getText();
GridLayout gl=new GridLayout(3,3);
JLabel jl1=new JLabel("查找内容:");
JLabel jl2=new JLabel("替换为:");
jfc.setLayout(gl);
jfc.add(jl1);
jfc.add(jtf);
jfc.add(jb);
jfc.add(jl2);
jfc.add(jt);
jfc.add(jbt);
JLabel jl3=new JLabel();
JLabel jl4=new JLabel();
jfc.add(jl3);
jfc.add(jl4);
jfc.add(jba);
jfc.setLocation(300,300);
jfc.pack();
jfc.setVisible(true);
jfc.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
}else if("版本".equals(comm)){
JDialog jd=new JDialog(frame,"关于对话框");
jd.setSize(200,200);
JLabel l=new JLabel("哈哈哈哈哈哈哈哈哈哈呵呵呵呵呵呵呵呵呵呵呵呵呵");
jd.add(l,BorderLayout.CENTER);
jd.setLocation(100,200);
jd.setSize(300,300);
jd.setVisible(true);
// jd.pack();
jd.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
}else if("开始".equals(comm)||"下一个".equals(comm)){
String temp=jtf.getText();
int s=value.indexOf(temp,start);
if(value.indexOf(temp,start)!=-1){
jta.setSelectionStart(s);
jta.setSelectionEnd(s+temp.length());
jta.setSelectedTextColor(Color.GREEN);
start=s+1;
jb.setText("下一个");
// value=value.substring(s+temp.length());//不能截取字串
}else {
JOptionPane.showMessageDialog(jf, "查找完毕!", "提示", 0, ic);
jf.dispose();
}
}else if("替换为".equals(comm)){
String temp=jtf.getText();
int s=value.indexOf(temp,start);
if(value.indexOf(temp,start)!=-1){
jta.setSelectionStart(s);
jta.setSelectionEnd(s+temp.length());
jta.setSelectedTextColor(Color.GREEN);
start=s+1;
jta.replaceSelection(jt.getText());
}else {
JOptionPane.showMessageDialog(jf, "查找完毕!", "提示", 0, ic);
jf.dispose();
}
}else if("全部替换".equals(comm)){
String temp=jta.getText();
temp=temp.replaceAll(jtf.getText(), jt.getText());
jta.setText(temp);
}
}
public String read(){
String temp="";
try {
FileInputStream fis = new FileInputStream(f.getAbsolutePath());
byte[] b=new byte[1024];
while(true){
int num=fis.read(b);
if(num==-1)break;
temp=temp+new String(b,0,num);
}
fis.close();
} catch (Exception e1) {
e1.printStackTrace();
}
return temp;
}
public void write(){
try {
FileOutputStream fos=new FileOutputStream(f);
fos.write(jta.getText().getBytes());
fos.close();
} catch (Exception e) {
e.printStackTrace();
}
}
public void newNew(){
frame.dispose();
new MyNotepad();
flag=true;
}
public MyNotepad(){
JMenuBar jmb=new JMenuBar();
String[] menuLab={"文件","编辑","帮助"};
String[][] menuItemLab={{"新建","打开","保存","另存","退出"},
{"撤销","剪切","复制","粘贴","删除","全选","查找","替换"},
{"版本"}};
for(int i=0;imenuLab.length;i++){
JMenu menu=new JMenu(menuLab[i]);
jmb.add(menu);
for(int j=0;jmenuItemLab[i].length;j++){
JMenuItem jmi=new JMenuItem(menuItemLab[i][j]);
menu.add(jmi);
jmi.addActionListener(this);
}
}
frame.setJMenuBar(jmb);
jta.setLineWrap(true);//自动换行
JScrollPane jsp=new JScrollPane(jta);//滚动窗口面板
frame.add(jsp);
jb.addActionListener(this);
jbt.addActionListener(this);
jba.addActionListener(this);
frame.setLocation(200,50);
frame.setSize(620,660);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new MyNotepad();
}
}
这个java程序如何实现换行？
将JLabel jbl=new JLabel(); 改为：JTextArea jb1 = new JTextArea();
然后将你注释的两条随便哪条解释就可以实现你要的功能了……
用java做文本编译器
给你个简单的记事本代码，自己看着修改吧！
package com.csk.notepad;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
public class MyNotepad implements ActionListener {
private JFrame frame = new JFrame("Notepad By ChenXiaoKang");
private JTextArea jta = new JTextArea();
private String result = "";
private boolean flag = true;
private File f;
private JButton jb = new JButton("开始");
private JTextField jtf = new JTextField(15);
private JTextField jt = new JTextField(15);
private JButton jbt = new JButton("替换为");
private JButton jba = new JButton("全部替换");
private Icon ic = new ImageIcon("D:\\java课堂笔记\\GUI\\11.gif");
private String value;
private int start = 0;
private JFrame jf = new JFrame("查找");
private JFrame jfc = new JFrame("替换");
@Override
public void actionPerformed(ActionEvent e) {
String comm = e.getActionCommand();
if ("新建".equals(comm)) {
if (!(frame.getTitle().equals("新记事本"))) {
if (!flag) {
write();
newNew();
} else {
JFileChooser jfc = new JFileChooser("D:\\java课堂笔记");
int returnVal = jfc.showDialog(null, "保存为");
if (returnVal == JFileChooser.APPROVE_OPTION) {// 选择文件后再执行下面的语句，保证了程序的健壮性
f = jfc.getSelectedFile();
flag = false;
write();
}
}
} else if (!(jta.getText().isEmpty())) {
JFileChooser jfc = new JFileChooser("D:\\java课堂笔记");
int returnVal = jfc.showDialog(null, "保存为");
if (returnVal == JFileChooser.APPROVE_OPTION) {// 选择文件后再执行下面的语句，保证了程序的健壮性
f = jfc.getSelectedFile();
flag = false;
write();
newNew();
}
} else {
newNew();
}
} else if ("打开".equals(comm)) {
JFileChooser jfc = new JFileChooser("D:\\java课堂笔记");
jfc.setDialogType(JFileChooser.OPEN_DIALOG);
int returnVal = jfc.showOpenDialog(null);
if (returnVal == JFileChooser.APPROVE_OPTION) {// 选择文件后再执行下面的语句，保证了程序的健壮性
f = jfc.getSelectedFile();
frame.setTitle(f.getName());
result = read();
flag = false;
value = result;
jta.setText(result);
}
} else if ("保存".equals(comm)) {
JFileChooser jfc = new JFileChooser("D:\\java课堂笔记");
if (flag) {
int returnVal = jfc.showDialog(null, "保存为");
if (returnVal == JFileChooser.APPROVE_OPTION) {// 选择文件后再执行下面的语句，保证了程序的健壮性
f = jfc.getSelectedFile();
flag = false;
write();
}
} else {
write();
}
} else if ("另存".equals(comm)) {
JFileChooser jfc = new JFileChooser("D:\\java课堂笔记");
int returnVal = jfc.showDialog(null, "另存");
if (returnVal == JFileChooser.APPROVE_OPTION) {// 选择文件后再执行下面的语句，保证了程序的健壮性
f = jfc.getSelectedFile();
write();
}
} else if ("退出".equals(comm)) {
System.exit(0);
} else if ("撤销".equals(comm)) {
jta.setText(value);
} else if ("剪切".equals(comm)) {
value = jta.getText();
jta.cut();
} else if ("复制".equals(comm)) {
jta.copy();
} else if ("粘贴".equals(comm)) {
value = jta.getText();
jta.paste();
} else if ("删除".equals(comm)) {
value = jta.getText();
jta.replaceSelection(null);
} else if ("全选".equals(comm)) {
jta.selectAll();
} else if ("查找".equals(comm)) {
value = jta.getText();
jf.add(jtf, BorderLayout.CENTER);
jf.add(jb, BorderLayout.SOUTH);
jf.setLocation(300, 300);
jf.pack();
jf.setVisible(true);
jf.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
} else if ("替换".equals(comm)) {
value = jta.getText();
GridLayout gl = new GridLayout(3, 3);
JLabel jl1 = new JLabel("查找内容:");
JLabel jl2 = new JLabel("替换为:");
jfc.setLayout(gl);
jfc.add(jl1);
jfc.add(jtf);
jfc.add(jb);
jfc.add(jl2);
jfc.add(jt);
jfc.add(jbt);
JLabel jl3 = new JLabel();
JLabel jl4 = new JLabel();
jfc.add(jl3);
jfc.add(jl4);
jfc.add(jba);
jfc.setLocation(300, 300);
jfc.pack();
jfc.setVisible(true);
jfc.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
} else if ("版本".equals(comm)) {
JDialog jd = new JDialog(frame, "关于对话框");
jd.setSize(200, 200);
JLabel l = new JLabel("哈哈哈哈哈哈哈哈哈哈呵呵呵呵呵呵呵呵呵呵呵呵呵");
jd.add(l, BorderLayout.CENTER);
jd.setLocation(100, 200);
jd.setSize(300, 300);
jd.setVisible(true);
// jd.pack();
jd.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
} else if ("开始".equals(comm) || "下一个".equals(comm)) {
String temp = jtf.getText();
int s = value.indexOf(temp, start);
if (value.indexOf(temp, start) != -1) {
jta.setSelectionStart(s);
jta.setSelectionEnd(s + temp.length());
jta.setSelectedTextColor(Color.GREEN);
start = s + 1;
jb.setText("下一个");
// value=value.substring(s+temp.length());//不能截取字串
} else {
JOptionPane.showMessageDialog(jf, "查找完毕!", "提示", 0, ic);
jf.dispose();
}
} else if ("替换为".equals(comm)) {
String temp = jtf.getText();
int s = value.indexOf(temp, start);
if (value.indexOf(temp, start) != -1) {
jta.setSelectionStart(s);
jta.setSelectionEnd(s + temp.length());
jta.setSelectedTextColor(Color.GREEN);
start = s + 1;
jta.replaceSelection(jt.getText());
} else {
JOptionPane.showMessageDialog(jf, "查找完毕!", "提示", 0, ic);
jf.dispose();
}
} else if ("全部替换".equals(comm)) {
String temp = jta.getText();
temp = temp.replaceAll(jtf.getText(), jt.getText());
jta.setText(temp);
}
}
public String read() {
String temp = "";
try {
FileInputStream fis = new FileInputStream(f.getAbsolutePath());
byte[] b = new byte[1024];
while (true) {
int num = fis.read(b);
if (num == -1)
break;
temp = temp + new String(b, 0, num);
}
fis.close();
} catch (Exception e1) {
e1.printStackTrace();
}
return temp;
}
public void write() {
try {
FileOutputStream fos = new FileOutputStream(f);
fos.write(jta.getText().getBytes());
fos.close();
} catch (Exception e) {
e.printStackTrace();
}
}
public void newNew() {
frame.dispose();
new MyNotepad();
flag = true;
}
public MyNotepad() {
JMenuBar jmb = new JMenuBar();
String[] menuLab = { "文件", "编辑", "帮助" };
String[][] menuItemLab = { { "新建", "打开", "保存", "另存", "退出" },
{ "撤销", "剪切", "复制", "粘贴", "删除", "全选", "查找", "替换" }, { "版本" } };
for (int i = 0; i menuLab.length; i++) {
JMenu menu = new JMenu(menuLab[i]);
jmb.add(menu);
for (int j = 0; j menuItemLab[i].length; j++) {
JMenuItem jmi = new JMenuItem(menuItemLab[i][j]);
menu.add(jmi);
jmi.addActionListener(this);
}
}
frame.setJMenuBar(jmb);
jta.setLineWrap(true);// 自动换行
JScrollPane jsp = new JScrollPane(jta);// 滚动窗口面板
frame.add(jsp);
jb.addActionListener(this);
jbt.addActionListener(this);
jba.addActionListener(this);
frame.setLocation(200, 50);
frame.setSize(620, 660);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new MyNotepad();
}
}
怎么用JAVA编程编写一个计算器？
打开IED：打开自己java编程的软件，采用的是eclipse软件。
建立java工程。
编写类。
编写类的详细步骤
1.类的基本结构：
由于这里用到了界面，所以要进行窗口界面的编程，按钮事件的处理，和计算处理界面；
package MyCaculator;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class MyCaculator extends JFrame {
private int add=1,sub=2,mul=3,div=4;
private int op=0;
boolean ifOp;
private String output="0";
private Button[] jba=new Button[]{new Button("7"),new Button("8"),
new Button("9"),new Button("+"),
new Button("4"),new Button("5"),new Button("6"),new Button("-"),
new Button("1"),new Button("2"),new Button("3"),new Button("*"),
new Button("0"),new Button("."),new Button("="),new Button("/")};
private JPanel jpt=new JPanel();
private JPanel jpb=new JPanel();
private JTextField jtf=new JTextField("");
private MyCaculator(){
}
private void operate(String x){
}
public String add(String x){
return output;
}
public String subtract(String x){
return output;
}
public String multiply(String x){
return output;
}
public String divide(String x){
return output;
}
public String Equals(String x){
return output;
}
public void opClean(){
}
class setOperate_Act implements ActionListener{
public void actionPerformed(ActionEvent e) {
}
}
class setLabel_Act implements ActionListener{
public void actionPerformed(ActionEvent e) {
}
}
public static void main(String[] args) {
}
}
2.建立构造方法：
所谓构造方法就是，对自己的主类进行初始化，代码如下：
private MyCaculator(){
jpt.setLayout(new BorderLayout());
jpt.add(jtf);
this.add(jpt,BorderLayout.NORTH);
jpb.setLayout(new GridLayout(4,4));
for(int i=0;ijba.length;i++){
jpb.add(jba[i]);
if(i==3||i==7||i==11||i==15||i==14)
jba[i].addActionListener(new setOperate_Act());
else
jba[i].addActionListener(new setLabel_Act());
}
this.add(jpb,BorderLayout.CENTER);
this.setSize(250, 200);
this.setResizable(false);
this.setVisible(true);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
3.建立数据计算方法
这里的数据计算方法有6个，一个是主方法其他几个是加减乘除的处理方法，代码如下：
private void operate(String x){
double x1=Double.valueOf(x);
double y=Double.valueOf(output);
switch(op){
case 0:output=x;break;
case 1:output=String.valueOf(y+x1);break;
case 2:output =String.valueOf(y-x1);break;
case 3:output =String.valueOf(y*x1);break;
case 4:
if(x1!=0) output=String.valueOf(y/x1);
else output="不能为0";
break;
}
}
public String add(String x){
operate(x);
op=add;
return output;
}
public String subtract(String x){
operate(x);
op=sub;
return output;
}
public String multiply(String x){
operate(x);
op=mul;
return output;
}
public String divide(String x){
operate(x);
op=div;
return output;
}
public String Equals(String x){
operate(x);
op=0;
return output;
}
public void opClean(){
op=0;
output ="0";
}
4.事件处理方法
这里的时间处理方法，没有建立一个整体的方法，二是在为了便于处理的方法，将按钮事件分成两个部分，并采用两个子类来实现，这两个类时内部类要写在主类内部的，代码如下：
class setOperate_Act implements ActionListener{
public void actionPerformed(ActionEvent e) {
if(e.getSource()==jba[3]){
jtf.setText(add(jtf.getText()));
ifOp=true;
}
else if(e.getSource()==jba[7]){
jtf.setText(subtract(jtf.getText()));
ifOp=true;
}
else if(e.getSource()==jba[11]){
jtf.setText(multiply(jtf.getText()));
ifOp=true;
}
else if(e.getSource()==jba[15]){
jtf.setText(divide(jtf.getText()));
ifOp=true;
}
else if(e.getSource()==jba[14]){
jtf.setText(Equals(jtf.getText()));
ifOp=true;
}
}
}
class setLabel_Act implements ActionListener{
public void actionPerformed(ActionEvent e) {
Button tempb=(Button)e.getSource();
if(ifOp){
jtf.setText(tempb.getLabel());
ifOp=false;
}else {
jtf.setText(jtf.getText()+tempb.getLabel());
}
}
}
5.建立main方法：
要想实现我们的代码，我们需在main方法中，实例化我们的对象。
public static void main(String[] args) {
new MyCaculator();
}
Java web中JDBC，DAO，mybatis，springJBA Data有什么异同
如果说与数据库打交道的意义上讲，JDBC是最基础的，mybatis等框架主键也是基于此。另外springJBA Data是什么鬼，是Spring Data JPA 吧，JPA全称为Java持久性API（Java Persistence API），JPA是Java EE 5标准之一。
从应用的角度来看，直接使用JDBC写代码连接数据库已经很少了，除了一些小项目；mybatis可以自动生成dao和daoImpl以及配置文件，可以修改sql语句，使用较为灵活；
为了简化程序与数据库交互的代码，spring提供了一个现成的dao层框架，spring家族提供的spring-data适用于关系型数据库和nosql数据库 ，虽然使用起来很方便，但其简化了SQL功能如查询所有数据 findAll()，但复杂查询就有些麻烦了；
Java语言设计一个计算器！要稍微有点亮点的，比如输出的字是彩色的等，还要有详细的解说．
自己改吧，不难。。。
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import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTextField;
class Stack_Float
{
float nums[];
int top;
Stack_Float()
{
nums = new float[50];
top = -1;
}
boolean IsEmpty()
{
if (top == -1)
return true;
else
return false;
}
float Pop_Stack()
{
if (top == -1)
{
return 0;
}
top--;
return nums[top + 1];
}
float GetTop()
{
return nums[top];
}
void Push_Stack(float num)
{
if (top == 49)
return;
top++;
nums[top] = num;
}
}
class Stack_Char
{
char str[];
int top;
Stack_Char()
{
str = new char[50];
top = -1;
}
boolean CanPush(char c)
{
int temp = top;
if (c == '(')
{
while (temp != -1)
{
if (str[temp] == '(')
{
return false;
}
temp--;
}
}
temp = top;
if (c == '[')
{
while (temp != -1)
{
if (str[temp] == '[' || str[temp] == '(')
{
return false;
}
temp--;
}
}
if (c == '{')
{
while (temp != -1)
{
if (str[temp] == '{' || str[temp] == '[' || str[temp] == '(')
{
return false;
}
temp--;
}
}
return true;
}
boolean IsEmpty()
{
if (top == -1)
return true;
else
return false;
}
void Push_Stack(char ch)
{
if (top == 49)
return;
top++;
str[top] = ch;
}
char Pop_Stack()
{
if (top == -1)
return '\0';
top--;
return str[top + 1];
}
char GetTop()
{
if (top == -1)
{
System.out.print("error");
System.exit(0);
}
return str[top];
}
}
public class jisuanqi extends javax.swing.JFrame implements ActionListener
{
JTextField text = new JTextField();
JTextField text1 = new JTextField();
JButton jButton1 = new JButton();
JButton jButton2 = new JButton();
JButton jButton3 = new JButton();
JButton jButton4 = new JButton();
JButton jButton5 = new JButton();
JButton jButton6 = new JButton();
JButton jButton7 = new JButton();
JButton jButton8 = new JButton();
JButton jButton9 = new JButton();
JButton jButton10 = new JButton();
JButton jButton11 = new JButton();
JButton jButton12 = new JButton();
JButton jButton13 = new JButton();
JButton jButton14 = new JButton();
JButton jButton15 = new JButton();
JButton jButton16 = new JButton();
JButton jButton17 = new JButton();
JButton jButton18 = new JButton();
JButton jButton19 = new JButton();
JButton jButton20 = new JButton();
JButton jButton21 = new JButton();
JButton jButton22 = new JButton();
String show = "";
public jisuanqi()
{
initComponents();
}
char[] TranSmit(char str[])
{
char houzhui[] = new char[50]; // 存放后缀表达式的字符串
int i = 0, j = 0;
char c = str[i];
Stack_Char s = new Stack_Char(); // 存放运算符的栈
while (c != '=') // 对算术表达式扫描未结束时
{
if (c = '0' c = '9')
{
while (c = '0' c = '9')// 数字直接入栈
{
houzhui[j] = c;
j++;
i++;
c = str[i];
}
houzhui[j] = '#';// 用#隔开数字
j++;
}
switch (c) // 扫描到运算符时
{
case '+':
case '-':
case '*':
case '/':
case '(':
case '[':
case '{':
if (s.IsEmpty() == true) // 栈空,直接入栈
{
s.Push_Stack(c);
i++;
c = str[i];
break;
}
if (ComPare(s.GetTop(), c) == -1) {
s.Push_Stack(c); // 入栈
i++;
c = str[i];
break;
}
if (ComPare(s.GetTop(), c) == 1) {
houzhui[j] = s.Pop_Stack();// 出栈元素存入后缀表达式
j++;
break;
}
case ')': // 扫描到 )
while (s.GetTop() != '(') // 未扫描到 ( 时,出栈
{
houzhui[j] = s.Pop_Stack();
j++;
}
s.Pop_Stack(); // '(' 出栈
i++;
c = str[i];
break;
case ']': // 扫描到 ]
while (s.GetTop() != '[') // 未扫描到 [ 时,出栈
{
houzhui[j] = s.Pop_Stack();
j++;
}
s.Pop_Stack(); // '[' 出栈
i++;
c = str[i];
break;
case '}': // 扫描到 }
while (s.GetTop() != '{') // 未扫描到 { 时,出栈
{
houzhui[j] = s.Pop_Stack();
j++;
}
s.Pop_Stack(); // '{' 出栈
i++;
c = str[i];
break;
}
}
while (s.IsEmpty() != true)// 把剩余的运算符直接出栈
{
houzhui[j] = s.Pop_Stack();
j++;
}
houzhui[j] = '=';// 后缀表达式后面加 =
j++;
houzhui[j] = '\0';
j++;
return houzhui;
}
float Count(char str[])
{
Stack_Float s = new Stack_Float();// 定义存放数字的栈
char c = str[0];
int i = 0;
float result = 0, temp, left, right;
while (c != '=') // 未扫描到 = 时
{
if (c = '0' c = '9')// 扫描到数字
{
temp = 0;
while (c != '#')// 未读到分隔符时
{
temp = temp * 10 + c - '0';
i++;
c = str[i];
}
s.Push_Stack(temp);// 进栈
}
switch (c)// 扫描到运算符时
{
case '+':
{
result = s.Pop_Stack() + s.Pop_Stack();// 2个数字出栈相加
s.Push_Stack(result);// 最后得数进栈
break;
}
case '-':
{
right = s.Pop_Stack();// 右操作数出栈
left = s.Pop_Stack();// 左操作数出栈
result = left - right;
s.Push_Stack(result);
break;
}
case '*':
{
result = s.Pop_Stack() * s.Pop_Stack();// 2个数字出栈相乘
s.Push_Stack(result);
break;
}
case '/':
{
right = s.Pop_Stack();// 右操作数出栈
left = s.Pop_Stack();// 左操作数出栈
result = left / right;
s.Push_Stack(result);
break;
}
}
i++;
c = str[i];
}
return result;
}
int ComPare(char a, char b) // 判断运算符的优先级函数
{
int s[][] = {// 栈顶元素高于算术表达式中的元素时, 返回 1,否则返回 -1
{ 1, 1, -1, -1, -1, 1, -1, 1, -1, 1 },
{ 1, 1, -1, -1, -1, 1, -1, 1, -1, 1 },
{ 1, 1, 1, 1, -1, 1, -1, 1, -1, 1 },
{ 1, 1, 1, 1, -1, 1, -1, 1, -1, 1 },
{ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
{ 1, 1, 1, 1, -1, 1, -1, -1, -1, -1 },
{ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
{ 1, 1, 1, 1, -1, -1, -1, -1, -1, 1 },
{ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
{ 1, 1, 1, 1, -1, -1, -1, -1, -1, -1 } };
char x1[] = { '+', '-', '*', '/', '(', ')', '[', ']', '{', '}' };// 栈顶元素
char x2[] = { '+', '-', '*', '/', '(', ')', '[', ']', '{', '}' };// 算术表达式中的元素
int k = 0, m, n = 0;
for (m = 0; m 10; m++) // 查找2个进行比较的运算符在表中的位置,并返回比较结果
{
for (n = 0; n 10; n++)
{
if (x1[m] == a x2[n] == b)
{
k = 1;
break; // 找到比较结果后,跳出循环
}
}
if (k == 1)
break;
}
return s[m][n];// 返回比较结果
}
public void actionPerformed(ActionEvent e)
{
if (e.getSource() == jButton1)
{
show += "1";
text.setText(show);
}
if (e.getSource() == jButton2)
{
show += "2";
text.setText(show);
}
if (e.getSource() == jButton3)
{
show += "3";
text.setText(show);
}
if (e.getSource() == jButton4)
{
show += "4";
text.setText(show);
}
if (e.getSource() == jButton5)
{
show += "5";
text.setText(show);
}
if (e.getSource() == jButton6)
{
show += "6";
text.setText(show);
}
if (e.getSource() == jButton7)
{
show += "7";
text.setText(show);
}
if (e.getSource() == jButton8)
{
show += "8";
text.setText(show);
}
if (e.getSource() == jButton9)
{
show += "9";
text.setText(show);
}
if (e.getSource() == jButton10)
{
show += "0";
text.setText(show);
}
if (e.getSource() == jButton11)
{
show += "+";
text.setText(show);
}
if (e.getSource() == jButton12)
{
show += "-";
text.setText(show);
}
if (e.getSource() == jButton13)
{
show += "*";
text.setText(show);
}
if (e.getSource() == jButton14)
{
show += "/";
text.setText(show);
}
if (e.getSource() == jButton15)
{
show += "(";
text.setText(show);
}
if (e.getSource() == jButton16)
{
show += ")";
text.setText(show);
}
if (e.getSource() == jButton17)
{
show += "[";
text.setText(show);
}
if (e.getSource() == jButton18)
{
show += "]";
text.setText(show);
}
if (e.getSource() == jButton19)
{
show += "{";
text.setText(show);
}
if (e.getSource() == jButton20)
{
show += "}";
text.setText(show);
}
if (e.getSource() == jButton21)
{
show = "";
text.setText("");
text1.setText("");
}
if (e.getSource() == jButton22)
{
show += "=";
text.setText(show);
char str1[] = new char[50];
char str2[] = new char[50];
float result = 0;
str1 = show.toCharArray();
str2 = TranSmit(str1);
result = Count(str2);
text1.setText((new String(str2)).trim());
text.setText("" + result);
show = "";
}
}
private void initComponents()
{
text.setBounds(10, 10, 270, 30);
text1.setBounds(10, 50, 270, 30);
jButton1.setBounds(10, 90, 60, 25);
jButton2.setBounds(80, 90, 60, 25);
jButton3.setBounds(150, 90, 60, 25);
jButton4.setBounds(220, 90, 60, 25);
jButton5.setBounds(10, 120, 60, 25);
jButton6.setBounds(80, 120, 60, 25);
jButton7.setBounds(150, 120, 60, 25);
jButton8.setBounds(220, 120, 60, 25);
jButton9.setBounds(10, 150, 60, 25);
jButton10.setBounds(80, 150, 60, 25);
jButton11.setBounds(150, 150, 60, 25);
jButton12.setBounds(220, 150, 60, 25);
jButton13.setBounds(10, 180, 60, 25);
jButton14.setBounds(80, 180, 60, 25);
jButton15.setBounds(150, 180, 60, 25);
jButton16.setBounds(220, 180, 60, 25);
jButton17.setBounds(150, 210, 60, 25);
jButton18.setBounds(220, 210, 60, 25);
jButton19.setBounds(10, 210, 60, 25);
jButton20.setBounds(80, 210, 60, 25);
jButton21.setBounds(10, 240, 60, 25);
jButton22.setBounds(80, 240, 60, 25);
jButton1.setText("1");
jButton2.setText("2");
jButton3.setText("3");
jButton4.setText("4");
jButton5.setText("5");
jButton6.setText("6");
jButton7.setText("7");
jButton8.setText("8");
jButton9.setText("9");
jButton10.setText("0");
jButton11.setText("+");
jButton12.setText("-");
jButton13.setText("*");
jButton14.setText("/");
jButton15.setText("(");
jButton16.setText(")");
jButton17.setText("[");
jButton18.setText("]");
jButton19.setText("{");
jButton20.setText("}");
jButton21.setText("CE");
jButton22.setText("=");
jButton1.addActionListener(this);
jButton2.addActionListener(this);
jButton3.addActionListener(this);
jButton4.addActionListener(this);
jButton5.addActionListener(this);
jButton6.addActionListener(this);
jButton7.addActionListener(this);
jButton8.addActionListener(this);
jButton9.addActionListener(this);
jButton10.addActionListener(this);
jButton11.addActionListener(this);
jButton12.addActionListener(this);
jButton13.addActionListener(this);
jButton14.addActionListener(this);
jButton15.addActionListener(this);
jButton16.addActionListener(this);
jButton17.addActionListener(this);
jButton18.addActionListener(this);
jButton19.addActionListener(this);
jButton20.addActionListener(this);
jButton21.addActionListener(this);
jButton22.addActionListener(this);
add(text);
add(text1);
add(jButton1);
add(jButton2);
add(jButton3);
add(jButton4);
add(jButton5);
add(jButton6);
add(jButton7);
add(jButton8);
add(jButton9);
add(jButton10);
add(jButton11);
add(jButton12);
add(jButton13);
add(jButton14);
add(jButton15);
add(jButton16);
add(jButton17);
add(jButton18);
add(jButton19);
add(jButton20);
add(jButton21);
add(jButton22);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(null);
setBounds(300, 300, 300, 300);
setVisible(true);
}
public static void main(String args[])
{
new jisuanqi();
}
}
javajba的介绍就聊到这里吧，感谢你花时间阅读本站内容，更多关于、javajba的信息别忘了在本站进行查找喔。
发布于：2022-12-02，除非注明，否则均为原创文章，转载请注明出处。