java记事本打印代码,记事本中的java代码如何编译

java windows记事本源代码

该项目代码包括两个文件：MainFrame.java和SelectTextFile.java。

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（SelectTextFile.java的代码这里就不贴了，太长了。你百度HI我吧^_^）

补充说明：我这个里面没有“新建”，但其实新建也是一样调用那个SelectTextFile.java而已，而且，新建的时候更简单，只须按照路径调用File的.createNewFile()就可以了。具体我就不添加了。有疑问的话你可以百度HI我)

1.MainFrame.java代码：

package MyProject;

import java.awt.BorderLayout;

import javax.swing.JPanel;

import javax.swing.JFrame;

import java.awt.Dimension;

import javax.swing.JMenuBar;

import javax.swing.JMenu;

import javax.swing.JMenuItem;

import javax.swing.JLabel;

import java.awt.Rectangle;

import javax.swing.JTextArea;

import javax.swing.JScrollPane;

import java.awt.datatransfer.*;

import java.io.*;

public class MainFrame extends JFrame {

private static final long serialVersionUID = 1L;

private JPanel jContentPane = null;

private JMenuBar jJMenuBar = null;

private JMenu jMenu = null;

private JMenu jMenu1 = null;

private JMenu jMenu2 = null;

private JMenuItem jMenuItem = null;

private JMenuItem jMenuItem1 = null;

private JMenuItem jMenuItem2 = null;

private JMenuItem jMenuItem3 = null;

private JLabel jLabel = null;

private JScrollPane jScrollPane = null;

private JTextArea jTextArea = null;

private JMenuItem jMenuItem4 = null;

private JMenuItem jMenuItem5 = null;

private JMenuItem jMenuItem6 = null;

private JMenuItem jMenuItem7 = null;

private static MainFrame myMainFrame=null;

private static String textstr="";///用于记录文本文件的路径

private File myFile=null;

private FileReader myrder=null;

private FileWriter mywr=null;

/**

* This is the default constructor

*/

public MainFrame() {

super();

initialize();

}

/**

* This method initializes this

*

* @return void

*/

private void initialize() {

this.setSize(412, 350);

this.setJMenuBar(getJJMenuBar());

this.setContentPane(getJContentPane());

this.setTitle("JFrame");

this.addWindowListener(new java.awt.event.WindowAdapter() {

public void windowActivated(java.awt.event.WindowEvent e) {

if(!textstr.equals("")){

try{

myFile=new File(textstr);

if(!myFile.exists()){

myFile.createNewFile();

}

myrder=new FileReader(myFile);

char[] mychar=new char[(int)myFile.length()];

myrder.read(mychar);

String tmp=new String(mychar);

jTextArea.setText(tmp);

myrder.close();

}

catch(Exception ee){

ee.printStackTrace();

}

}

}

public void windowClosing(java.awt.event.WindowEvent e) {

System.exit(0);

}

});

this.setVisible(true);

myMainFrame=this;

}

/**

* This method initializes jContentPane

*

* @return javax.swing.JPanel

*/

private JPanel getJContentPane() {

if (jContentPane == null) {

jLabel = new JLabel();

jLabel.setBounds(new Rectangle(15, 18, 65, 18));

jLabel.setText("文件内容：");

jContentPane = new JPanel();

jContentPane.setLayout(null);

jContentPane.add(jLabel, null);

jContentPane.add(getJScrollPane(), null);

}

return jContentPane;

}

/**

* This method initializes jJMenuBar

*

* @return javax.swing.JMenuBar

*/

private JMenuBar getJJMenuBar() {

if (jJMenuBar == null) {

jJMenuBar = new JMenuBar();

jJMenuBar.add(getJMenu());

jJMenuBar.add(getJMenu1());

jJMenuBar.add(getJMenu2());

}

return jJMenuBar;

}

/**

* This method initializes jMenu

*

* @return javax.swing.JMenu

*/

private JMenu getJMenu() {

if (jMenu == null) {

jMenu = new JMenu();

jMenu.setText("文件");

jMenu.add(getJMenuItem());

jMenu.add(getJMenuItem1());

jMenu.add(getJMenuItem2());

jMenu.add(getJMenuItem3());

}

return jMenu;

}

/**

* This method initializes jMenu1

*

* @return javax.swing.JMenu

*/

private JMenu getJMenu1() {

if (jMenu1 == null) {

jMenu1 = new JMenu();

jMenu1.setText("编辑");

jMenu1.add(getJMenuItem4());

jMenu1.add(getJMenuItem5());

jMenu1.add(getJMenuItem6());

}

return jMenu1;

}

/**

* This method initializes jMenu2

*

* @return javax.swing.JMenu

*/

private JMenu getJMenu2() {

if (jMenu2 == null) {

jMenu2 = new JMenu();

jMenu2.setText("帮助");

jMenu2.add(getJMenuItem7());

}

return jMenu2;

}

/**

* This method initializes jMenuItem

*

* @return javax.swing.JMenuItem

*/

private JMenuItem getJMenuItem() {

if (jMenuItem == null) {

jMenuItem = new JMenuItem();

jMenuItem.setText("打开");

jMenuItem.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

MainFrame.this.myMainFrame.setEnabled(false);

SelectTextFile mysl=new SelectTextFile();

mysl.setVisible(true);

}

});

}

return jMenuItem;

}

/**

* This method initializes jMenuItem1

*

* @return javax.swing.JMenuItem

*/

private JMenuItem getJMenuItem1() {

if (jMenuItem1 == null) {

jMenuItem1 = new JMenuItem();

jMenuItem1.setText("关闭");

jMenuItem1.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

try{

myFile=null;

}

catch(Exception ee){

ee.printStackTrace();

}

jTextArea.setText("");

}

});

}

return jMenuItem1;

}

/**

* This method initializes jMenuItem2

*

* @return javax.swing.JMenuItem

*/

private JMenuItem getJMenuItem2() {

if (jMenuItem2 == null) {

jMenuItem2 = new JMenuItem();

jMenuItem2.setText("保存");

jMenuItem2.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

try{

String tmp=jTextArea.getText();

char[] mychar=tmp.toCharArray();

myFile.delete();

myFile.createNewFile();

mywr=new FileWriter(myFile);

mywr.write(mychar);

mywr.close();

}

catch(Exception ee){

ee.printStackTrace();

}

}

});

}

return jMenuItem2;

}

/**

* This method initializes jMenuItem3

*

* @return javax.swing.JMenuItem

*/

private JMenuItem getJMenuItem3() {

if (jMenuItem3 == null) {

jMenuItem3 = new JMenuItem();

jMenuItem3.setText("退出");

jMenuItem3.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

System.exit(0);

}

});

}

return jMenuItem3;

}

/**

* This method initializes jScrollPane

*

* @return javax.swing.JScrollPane

*/

private JScrollPane getJScrollPane() {

if (jScrollPane == null) {

jScrollPane = new JScrollPane();

jScrollPane.setBounds(new Rectangle(15, 46, 371, 225));

jScrollPane.setViewportView(getJTextArea());

}

return jScrollPane;

}

/**

* This method initializes jTextArea

*

* @return javax.swing.JTextArea

*/

private JTextArea getJTextArea() {

if (jTextArea == null) {

jTextArea = new JTextArea();

}

return jTextArea;

}

/**

* This method initializes jMenuItem4

*

* @return javax.swing.JMenuItem

*/

private JMenuItem getJMenuItem4() {

if (jMenuItem4 == null) {

jMenuItem4 = new JMenuItem();

jMenuItem4.setText("复制");

jMenuItem4.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

MainFrame.this.setClipboardText(MainFrame.this.getToolkit().getSystemClipboard(),jTextArea.getSelectedText());

}

});

}

return jMenuItem4;

}

/**

* This method initializes jMenuItem5

*

* @return javax.swing.JMenuItem

*/

private JMenuItem getJMenuItem5() {

if (jMenuItem5 == null) {

jMenuItem5 = new JMenuItem();

jMenuItem5.setText("剪切");

jMenuItem5.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

MainFrame.this.setClipboardText(MainFrame.this.getToolkit().getSystemClipboard(),jTextArea.getSelectedText());

jTextArea.setText(jTextArea.getText().substring(0,jTextArea.getSelectionStart()));

}

});

}

return jMenuItem5;

}

/**

* This method initializes jMenuItem6

*

* @return javax.swing.JMenuItem

*/

private JMenuItem getJMenuItem6() {

if (jMenuItem6 == null) {

jMenuItem6 = new JMenuItem();

jMenuItem6.setText("黏贴");

jMenuItem6.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

try{

jTextArea.setText(jTextArea.getText().substring(0,jTextArea.getSelectionStart()));

jTextArea.setText(jTextArea.getText()+(MainFrame.this.getClipboardText(MainFrame.this.getToolkit().getSystemClipboard())));

}

catch(Exception ee){

ee.printStackTrace();

}

}

});

}

return jMenuItem6;

}

/**

* This method initializes jMenuItem7

*

* @return javax.swing.JMenuItem

*/

private JMenuItem getJMenuItem7() {

if (jMenuItem7 == null) {

jMenuItem7 = new JMenuItem();

jMenuItem7.setText("关于记事本");

jMenuItem7.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

////暂无代码！！

}

});

}

return jMenuItem7;

}

public static void main(String args[]){

new MainFrame();

}

public static MainFrame getMyMainFrame() {

return myMainFrame;

}

public static void setMyMainFrame(MainFrame myMainFrame) {

MainFrame.myMainFrame = myMainFrame;

}

public static String getTextstr() {

return textstr;

}

public static void setTextstr(String textstr) {

MainFrame.textstr = textstr;

}

protected static String getClipboardText(Clipboard clip) throws Exception{

Transferable clipT = clip.getContents(null);// 获取剪切板中的内容

if (clipT != null) {

if (clipT.isDataFlavorSupported(DataFlavor.stringFlavor)) // 检查内容是否是文本类型

return (String)clipT.getTransferData(DataFlavor.stringFlavor);

}

return null;

}

protected static void setClipboardText(Clipboard clip, String writeMe) {

Transferable tText = new StringSelection(writeMe);

clip.setContents(tText, null);

}

} // @jve:decl-index=0:visual-constraint="10,10"

JAVA中怎么编写打印功能代码

Print.java－－打印内容定义 [code] import java.awt.*; import java.awt.event.*; import java.awt.print.*; import java.awt.image.*; import javax.swing.*; import javax.swing.event.*; import javax.swing.border.*; import javax.swing.event.*; import java.util.*; import java.io.*; public class Print implements Printable{ int m_wPage; int m_hPage; int m_orientation; Printable m_target; int maxNumPage=1; String title="数据表格打印"; Font titleFont=new Font("黑体",Font.BOLD,14); boolean hasTail=true; int tailAlign=0; int headAlign=0; int topSpace=0; int leftSpace=0; int yStart=0; int yEnd=0; int xStart=topSpace; int xEnd=0; int x=0,y=0; String strTemp="打印内容"; public void doPrint(){ try{ m_orientation=PageFormat.PORTRAIT; //设置打印对象，默认纸张 PrinterJob prnJob=PrinterJob.getPrinterJob(); PageFormat pageFormat=prnJob.defaultPage(); pageFormat.setOrientation(m_orientation); m_wPage=(int)(pageFormat.getWidth()); m_hPage=(int)(pageFormat.getHeight()); //将待打印的窗体根据默认纸张设置传入打印对象 prnJob.setPrintable(this,pageFormat); if(!prnJob.printDialog()) return; prnJob.print(); }catch(PrinterException ex){ ex.printStackTrace(); System.err.println("打印错误："+ex.toString()); } } /** * 初始化打印参数 */ public void initPrintParameter() { } /** *构造打印内容，以送打印机打印 */ public int print(Graphics pg,PageFormat pageFormat, int pageIndex) throws PrinterException{ //初始化打印参数 initPrintParameter(); //将画布设置为页面大小 pg.translate((int)pageFormat.getImageableX(), (int)pageFormat.getImageableY()); int wPage=0; int hPage=0; //根据打印机页面设置调整画布大小 if(pageFormat.getOrientation()==pageFormat.PORTRAIT){ wPage=(int)pageFormat.getImageableWidth(); hPage=(int)pageFormat.getImageableHeight(); } else{ wPage=(int)pageFormat.getImageableWidth(); wPage+=wPage/2; hPage=(int)pageFormat.getImageableHeight(); pg.setClip(0,0,wPage,hPage); } wPage=wPage-2*leftSpace; hPage=hPage-2*topSpace; xStart=leftSpace; xEnd=wPage-2; //为画布设置颜色和字体 int y=topSpace; pg.setFont(titleFont); pg.setColor(Color.black); //画标题，并使其居中 Font fn=pg.getFont(); FontMetrics fm=pg.getFontMetrics(); y+=fm.getAscent(); alignText(title,pg,y,xStart,xEnd,headAlign); y+=30; x=leftSpace+2; Font headerFont=new Font("宋体",Font.BOLD,14); pg.setFont(headerFont); fm=pg.getFontMetrics(); int h=fm.getAscent(); yStart=y-1; y+=h; pg.setFont(headerFont); fm=pg.getFontMetrics(); int header=y; h=fm.getHeight(); //计算行高，每页行数，总行数和指定页码的起始行、结束行 int rowH=Math.max(h,10); int tailH=rowH+30; int rowPerPage=0; int leftPix=0; if(hasTail){ rowPerPage=(hPage-header-tailH)/rowH; leftPix=(hPage-header-tailH)%rowH; yEnd=hPage-leftPix-tailH+2; } else{ rowPerPage=(hPage-header)/rowH; leftPix=(hPage-header)%rowH; yEnd=hPage-leftPix+2; } pg.drawString(strTemp,x,y); //画表格边框 pg.drawLine(xStart,yStart,xStart,yEnd); pg.drawLine(xStart,yStart,xEnd,yStart); pg.drawLine(xEnd,yStart,xEnd,yEnd); pg.drawLine(xStart,yEnd,xEnd,yEnd); //打印页码 if(hasTail){ int pageNumber=pageIndex+1; String s="第"+pageNumber+"页"; alignText(s,pg,yEnd+30,xStart,xEnd,tailAlign); } System.gc(); return PAGE_EXISTS; } /** * 文字排列，坐标在y处,显示范围（start-end） * 0表示居中显示，1表示左对齐，2表示右对齐 */ private void alignText(String s,Graphics pg,int y,int start, int end,int mode){ Font fn=pg.getFont(); FontMetrics fm=pg.getFontMetrics(); int wString=fm.stringWidth(s); int x=start; switch(mode) { case 0: if((end-start-wString)0) x=start+(end-start-wString)/2; break; case 1: break; case 2: if((end-start-wString)0) x=start+(end-start-wString); break; } pg.drawString(s,x,y); } public static void main(String[] args){ Print p=new Print(); p.doPrint(); } } [code] 运行方法： javac -d . Print.java java Print 自己运行一下 from:

采纳哦

java简单记事本源代码 带解释

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import javax.swing.border.*;

class test implements ActionListener

{

JFrame frame;

JButton b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11,b12,b13,b14,b15,b16,b17,b18,b19,b20,b21,b22,b23,b24,b25,b26,b27,b28,b29,b30,b31;

JTextArea ta;

JPanel p1,p2,p3,p4;

JMenuBar mb;

JMenu m1,m2,m3;

JMenuItem mt1,mt2,mt3,mt4,mt5,mt6,mt7;

JRadioButton rb1,rb2;

ButtonGroup bg;

Double d1=0.0,d2=0.0,d3=0.0,d4=1.0,d5=1.0;

String s1="",s2="",s3="",s4="";

int a=0;

char c1;

int i=0;

public static void main(String[] args)

{

test that=new test();

that.go();

}

public void go()

{

frame=new JFrame("计算器");

Container cp= frame.getContentPane();

cp.setLayout(new FlowLayout());

b1=new JButton("7");b2=new JButton("8");b3=new JButton("9");b4=new JButton("/");b5=new JButton("1/x");b6=new JButton("sin");b7=new JButton("log");

b8=new JButton("4");b9=new JButton("5");b10=new JButton("6");b11=new JButton("*");b12=new JButton("x^y");b13=new JButton("cos");b14=new JButton("ln");

b15=new JButton("1");b16=new JButton("2");b17=new JButton("3");b18=new JButton("-");b19=new JButton(new ImageIcon("lanying.gif"));b20=new JButton("tan");b21=new JButton("x^3");

b22=new JButton("0");b23=new JButton("+/-");b24=new JButton(".");b25=new JButton("+");b26=new JButton("√x");b27=new JButton("cot");b28=new JButton("x^2");

b29=new JButton("Backspace");b30=new JButton("C");b31=new JButton("=");

mb=new JMenuBar();

m1=new JMenu("文件(F)");m2=new JMenu("编辑(E)");m3=new JMenu("帮助(H)");

mt1=new JMenuItem("清零");mt2=new JMenuItem("退出");mt3=new JMenuItem("复制");mt4=new JMenuItem("粘贴");mt5=new JMenuItem("版本");mt6=new JMenuItem("标准型");mt7=new JMenuItem("科学型");

ta=new JTextArea(1,30);

p1=new JPanel();p2=new JPanel();p3=new JPanel();p4=new JPanel();

rb1=new JRadioButton("科学型");rb2=new JRadioButton("标准型");

bg=new ButtonGroup();

b1.setForeground(Color.blue);b1.setBackground(Color.white);b2.setForeground(Color.blue);b2.setBackground(Color.white);

b3.setForeground(Color.blue);b3.setBackground(Color.white);b8.setForeground(Color.blue);b8.setBackground(Color.white);

b9.setForeground(Color.blue);b9.setBackground(Color.white);b10.setForeground(Color.blue);b10.setBackground(Color.white);

b15.setForeground(Color.blue);b15.setBackground(Color.white);b16.setForeground(Color.blue);b16.setBackground(Color.white);

b17.setForeground(Color.blue);b17.setBackground(Color.white);b22.setForeground(Color.blue);b22.setBackground(Color.white);

b23.setForeground(Color.blue);b23.setBackground(Color.white);b24.setForeground(Color.blue);b24.setBackground(Color.white);

b4.setForeground(Color.red);b4.setBackground(Color.white);b11.setForeground(Color.red);b11.setBackground(Color.white);

b18.setForeground(Color.red);b18.setBackground(Color.white);b25.setForeground(Color.red);b25.setBackground(Color.white);

b5.setForeground(Color.blue);b5.setBackground(Color.white);b6.setForeground(Color.blue);b6.setBackground(Color.white);

b7.setForeground(Color.blue);b7.setBackground(Color.white);b12.setForeground(Color.blue);b12.setBackground(Color.white);

b13.setForeground(Color.blue);b13.setBackground(Color.white);b14.setForeground(Color.blue);b14.setBackground(Color.white);

b19.setForeground(Color.blue);b19.setBackground(Color.white);b20.setForeground(Color.blue);b20.setBackground(Color.white);

b21.setForeground(Color.blue);b21.setBackground(Color.white);b26.setForeground(Color.blue);b26.setBackground(Color.white);

b27.setForeground(Color.blue);b27.setBackground(Color.white);b28.setForeground(Color.blue);b28.setBackground(Color.white);

b29.setForeground(Color.red);b29.setBackground(Color.white);b30.setForeground(Color.red);b30.setBackground(Color.white);

b31.setForeground(Color.red);b31.setBackground(Color.white);

bg.add(rb1);bg.add(rb2);

p1.setBackground(Color.yellow);

cp.setBackground(Color.CYAN);

m1.setMnemonic(KeyEvent.VK_F);m2.setMnemonic(KeyEvent.VK_E);m3.setMnemonic(KeyEvent.VK_H);

m1.add(mt6);m1.add(mt7);m1.addSeparator();m1.add(mt1);m1.addSeparator();m1.add(mt2);m2.add(mt3);m2.addSeparator();m2.add(mt4);m3.add(mt5);

mb.add(m1);mb.add(m2);mb.add(m3);

frame.setJMenuBar(mb);

p2.setLayout(new GridLayout(4,7));

p3.setLayout(new GridLayout(1,3));

ta.setEditable(false);

p1.add(ta);

p2.add(b1);p2.add(b2);p2.add(b3);p2.add(b4);p2.add(b5);p2.add(b6);p2.add(b7);

p2.add(b8);p2.add(b9);p2.add(b10);p2.add(b11);p2.add(b12);p2.add(b13);p2.add(b14);

p2.add(b15);p2.add(b16);p2.add(b17);p2.add(b18);p2.add(b19);p2.add(b20);p2.add(b21);

p2.add(b22);p2.add(b23);p2.add(b24);p2.add(b25);p2.add(b26);p2.add(b27);p2.add(b28);

p3.add(b29);p3.add(b30);p3.add(b31);

Border etched=BorderFactory.createEtchedBorder();

Border border=BorderFactory.createTitledBorder(etched,"计算类型");

p4.add(rb1);p4.add(rb2);

p4.setBorder(border);

b2.setActionCommand("8");

b2.addActionListener(this);

cp.add(p1);cp.add(p4);cp.add(p2);cp.add(p3);

frame.setSize(400,330);

frame.setVisible(true);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

b1.setActionCommand("7");

b1.addActionListener(this);

b2.setActionCommand("8");

b2.addActionListener(this);

b3.setActionCommand("9");

b3.addActionListener(this);

b4.setActionCommand("/");

b4.addActionListener(this);

b5.setActionCommand("1/x");

b5.addActionListener(this);

b6.setActionCommand("sin");

b6.addActionListener(this);

b7.setActionCommand("log");

b7.addActionListener(this);

b8.setActionCommand("4");

b8.addActionListener(this);

b9.setActionCommand("5");

b9.addActionListener(this);

b10.setActionCommand("6");

b10.addActionListener(this);

b11.setActionCommand("*");

b11.addActionListener(this);

b12.setActionCommand("x^y");

b12.addActionListener(this);

b13.setActionCommand("cos");

b13.addActionListener(this);

b14.setActionCommand("ln");

b14.addActionListener(this);

b15.setActionCommand("1");

b15.addActionListener(this);

b16.setActionCommand("2");

b16.addActionListener(this);

b17.setActionCommand("3");

b17.addActionListener(this);

b18.setActionCommand("-");

b18.addActionListener(this);

b19.setActionCommand("x!");

b19.addActionListener(this);

b20.setActionCommand("tan");

b20.addActionListener(this);

b21.setActionCommand("x^3");

b21.addActionListener(this);

b22.setActionCommand("0");

b22.addActionListener(this);

b23.setActionCommand("+/-");

b23.addActionListener(this);

b24.setActionCommand(".");

b24.addActionListener(this);

b25.setActionCommand("+");

b25.addActionListener(this);

b26.setActionCommand("√x");

b26.addActionListener(this);

b27.setActionCommand("cot");

b27.addActionListener(this);

b28.setActionCommand("x^2");

b28.addActionListener(this);

b29.setActionCommand("Backspace");

b29.addActionListener(this);

b30.setActionCommand("C");

b30.addActionListener(this);

b31.setActionCommand("=");

b31.addActionListener(this);

rb1.setActionCommand("kxx");

rb1.addActionListener(this);

rb2.setActionCommand("bzx");

rb2.addActionListener(this);

}

public void actionPerformed(ActionEvent e) //throws Exception

{

if (e.getActionCommand()=="bzx")

{

b5.setEnabled(false);b6.setEnabled(false);b7.setEnabled(false);

b12.setEnabled(false);b13.setEnabled(false);b14.setEnabled(false);

b19.setEnabled(false);b20.setEnabled(false);b21.setEnabled(false);

b26.setEnabled(false);b27.setEnabled(false);b28.setEnabled(false);

}

if (e.getActionCommand()=="kxx")

{

b5.setEnabled(true);b6.setEnabled(true);b7.setEnabled(true);

b12.setEnabled(true);b13.setEnabled(true);b14.setEnabled(true);

b19.setEnabled(true);b20.setEnabled(true);b21.setEnabled(true);

b26.setEnabled(true);b27.setEnabled(true);b28.setEnabled(true);

}

if (e.getActionCommand()=="1")

{

ta.append("1");

}

if (e.getActionCommand()=="2")

{

ta.append("2");

}

if (e.getActionCommand()=="3")

{

ta.append("3");

}

if (e.getActionCommand()=="4")

{

ta.append("4");

}

if (e.getActionCommand()=="5")

{

ta.append("5");

}

if (e.getActionCommand()=="6")

{

ta.append("6");

}

if (e.getActionCommand()=="7")

{

ta.append("7");

}

if (e.getActionCommand()=="8")

{

ta.append("8");

}

if (e.getActionCommand()=="9")

{

ta.append("9");

}

if (e.getActionCommand()=="0")

{

ta.append("0");

}

if (e.getActionCommand()=="+")

{

s1=ta.getText();

d1 = Double.parseDouble(s1);

ta.setText("");

i=1;

}

if (e.getActionCommand()=="-")

{

s1=ta.getText();

d1 = Double.parseDouble(s1);

ta.setText("");

i=2;

}

if (e.getActionCommand()=="*")

{

s1=ta.getText();

d1 = Double.parseDouble(s1);

ta.setText("");

i=3;

}

if (e.getActionCommand()=="/")

{

s1=ta.getText();

d1 = Double.parseDouble(s1);

ta.setText("");

i=4;

}

if (e.getActionCommand()=="=")

{

s2=ta.getText();

d2=Double.parseDouble(s2);

if(i==1)

{

d3=d1+d2;

ta.setText( d3.toString());

}

if(i==2)

{

d3=d1-d2;

ta.setText( d3.toString());

}

if(i==3)

{

d3=d1*d2;

ta.setText( d3.toString());

}

if(i==4)

{

if(d2==0.0)

ta.setText("ERROR");

else

{

d3=d1/d2;

ta.setText( d3.toString());

}

}

if (i==5)

{

s2=ta.getText();

d2 = Double.parseDouble(s2);

for (int l=1;l=d2 ; l++)

{

d5=d5*d1;

}

ta.setText( d5.toString());

}

}

if (e.getActionCommand()=="C")

{

ta.setText("");

d4=1.0;

d5=1.0;

}

/*if (e.getActionCommand()=="Backspace")

{

s3=ta.getText();

a=s3.length();

//ta.cut(ta.select(a-1,a));

s4=ta.getText(1,3);

ta.setText(s4);

}

*/

if (e.getActionCommand()=="1/x")

{

s1=ta.getText();

d1 = Double.parseDouble(s1);

d2=1/d1;

ta.setText( d2.toString());

}

if (e.getActionCommand()==".")

{

ta.append(".");

}

if (e.getActionCommand()=="+/-")

{

s1=ta.getText();

d1 = Double.parseDouble(s1);

d2=0-d1;

ta.setText( d2.toString());

}

if (e.getActionCommand()=="x^2")

{

s1=ta.getText();

d1 = Double.parseDouble(s1);

d2=d1*d1;

ta.setText( d2.toString());

}

if (e.getActionCommand()=="x^3")

{

s1=ta.getText();

d1 = Double.parseDouble(s1);

d2=d1*d1*d1;

ta.setText( d2.toString());

}

if (e.getActionCommand()=="x^y")

{

s1=ta.getText();

d1 = Double.parseDouble(s1);

ta.setText("");

i=5;

// d2=d1*d1*d1;

// ta.setText( d2.toString());

}

if (e.getActionCommand()=="√x")

{

s1=ta.getText();

d1 = Double.parseDouble(s1);

d2=Math.sqrt(d1);

ta.setText( d2.toString());

}

if (e.getActionCommand()=="x!")

{

s1=ta.getText();

d1 = Double.parseDouble(s1);

if (d10)

{

ta.setText( "error");

}

else if (d1==0)

{

ta.setText( "0.0");

}

else {

for (int k=1;k=d1 ;k++ )

d4=d4*k;

ta.setText( d4.toString());

}

}

if (e.getActionCommand()=="sin")

{

s1=ta.getText();

d1 = Double.parseDouble(s1);

d2=Math.sin(3.1415926*d1/180);

ta.setText( d2.toString());

}

}

}

java怎么打印Hello Word！

public int print(Graphics gra, PageFormat pf, int pageIndex) throws PrinterException {

System.out.println("pageIndex=" + pageIndex);

Component c = null;

//print string

String str = "

Hello Word！

";

//转换成Graphics2D

Graphics2D g2 = (Graphics2D) gra;

//设置打印颜色为黑色

g2.setColor(Color.black);

//打印起点坐标

double x = pf.getImageableX();

double y = pf.getImageableY();

switch (pageIndex) {

case 0:

//设置打印字体（字体名称、样式和点大小）（字体名称可以是物理或者逻辑名称）

//Java平台所定义的五种字体系列：Serif、SansSerif、Monospaced、Dialog 和 DialogInput

Font font = new Font("新宋体", Font.PLAIN, 9);

g2.setFont(font);//设置字体

//BasicStroke bs_3=new BasicStroke(0.5f);

float[] dash1 = {2.0f};

//设置打印线的属性。

//1.线宽 2、3、不知道，4、空白的宽度，5、虚线的宽度，6、偏移量

g2.setStroke(new BasicStroke(0.5f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_MITER, 2.0f, dash1, 0.0f));

//g2.setStroke(bs_3);//设置线宽

float heigth = font.getSize2D();//字体高度

System.out.println("x=" + x);

// -1- 用Graphics2D直接输出

//首字符的基线(右下部)位于用户空间中的 (x, y) 位置处

//g2.drawLine(10,10,200,300);

Image src = Toolkit.getDefaultToolkit().getImage("F:\\workspace\\QQ.png");

g2.drawImage(src, (int) x, (int) y, c);

int img_Height = src.getHeight(c);

int img_width = src.getWidth(c);

//System.out.println("img_Height="+img_Height+"img_width="+img_width) ;

g2.drawString(str, (float) x, (float) y + 1 * heigth + img_Height);

g2.drawLine((int) x, (int) (y + 1 * heigth + img_Height + 10), (int) x + 200, (int) (y + 1 * heigth + img_Height + 10));

g2.drawImage(src, (int) x, (int) (y + 1 * heigth + img_Height + 11), c);

return PAGE_EXISTS;

default:

return NO_SUCH_PAGE;

}

}

使用记事本编写JAVA程序,并运行输出结果,具体的实现步骤是什么?

1、首先在电脑中新建一个记事本，将记事本的后缀改为“.java”，如下图所示。

2、然后使用记事本的方式打开，输入java程序代码，如下图所示。

3、接着在键盘上按“win+R”快捷键键打开运行，输入“cmd”，如下图所示。

4、在命令行输入“D:”，按“Enter”键进去D盘，再输入“cd Desktop”进去Desktop文件夹，如下图所示。

5、最后再输入“javac Test.java”，按“Enter”键编译java程序，如下图所示就完成了。