1.myeclipse 2015 stable 1.0 进不了marketplace
2.关于java中DecimalFormat的问题。
3.JAVA实现计算器功能

myeclipse 2015 stable 1.0 进不了marketplace

       ç”ŸæˆMyEclipse8.5注册码的java源码 生成MyEclipse8.5注册码的java源码 MyEclipseKeyGen MyEclipse8.5注册机 MyEclipse8.5注册码生成 MyEclipse8.5注册机源码

       [java] view plaincopyprint?岳阳楼小程序源码

       import java.io.BufferedReader;

       import java.io.IOException;

       import java.io.InputStreamReader;

       public class MyEclipseKeyGen {

        private static final String LL = "Decompiling this copyrighted software is a violation of both your license agreement and the Digital Millenium Copyright Act of (http://www.loc.gov/copyright/legislation/dmca.pdf). Under section of the DMCA, penalties range up to a $, fine or up to five years imprisonment for a first offense. Think about it; pay for a license, avoid prosecution, and feel better about yourself.";

        public String getSerial(String userId, String licenseNum) {

        java.util.Calendar cal = java.util.Calendar.getInstance();

        cal.add(1, 3);

        cal.add(6, -1);

        java.text.NumberFormat nf = new java.text.DecimalFormat("");

        licenseNum = nf.format(Integer.valueOf(licenseNum));

        String verTime = new StringBuilder("-").append(

        new java.text.SimpleDateFormat("yyMMdd").format(cal.getTime()))

        .append("0").toString();

        String type = "YE3MP-";

        String need = new StringBuilder(userId.substring(0, 1)).append(type)

        .append("").append(licenseNum).append(verTime).toString();

        String dx = new StringBuilder(need).append(LL).append(userId)

        .toString();

        int suf = this.decode(dx);

        String code = new StringBuilder(need).append(String.valueOf(suf))

        .toString();

        return this.change(code);

        }

        private int decode(String s) {

        int i;

        char[] ac;

        int j;

        int k;

        i = 0;

        ac = s.toCharArray();

        j = 0;

        k = ac.length;

        while (j < k) {

        i = ( * i) + ac[j];

        j++;

        }

        return Math.abs(i);

        }

        private String change(String s) {

        byte[] abyte0;

        char[] ac;

        int i;

        int k;

        int j;

        abyte0 = s.getBytes();

        ac = new char[s.length()];

        i = 0;

        k = abyte0.length;

        while (i < k) {

        j = abyte0[i];

        if ((j >= ) && (j <= )) {

        j = (((j - ) + 5) % ) + ;

        } else if ((j >= ) && (j <= )) {

        j = (((j - ) + ) % ) + ;

        } else if ((j >= ) && (j <= )) {

        j = (((j - ) + ) % ) + ;

        }

        ac[i] = (char) j;

        i++;

        }

        return String.valueOf(ac);

        }

        public MyEclipseKeyGen() {

        super();

        }

        public static void main(String[] args) {

        try {

        System.out.println("please input register name:");

        BufferedReader reader = new BufferedReader(new InputStreamReader(

        System.in));

        String userId = null;

        userId = reader.readLine();

        MyEclipseKeyGen myeclipsekeygen = new MyEclipseKeyGen();

        String res = myeclipsekeygen.getSerial(userId, "5");

        System.out.println("Serial:" + res);

        reader.readLine();

        } catch (IOException ex) {

        }

        }

       }

关于java中DecimalFormat的问题。

       把newSalary转为double型，dai源码然后再format就好了，隐士源码看源码就会知道，源码辨别String类型是kepserver源码不被允许的

public final StringBuffer format(Object number,

                                            StringBuffer toAppendTo,

                                            FieldPosition pos) {

               if (number instanceof Long || number instanceof Integer ||

                          number instanceof Short || number instanceof Byte ||

                          number instanceof AtomicInteger ||

                          number instanceof AtomicLong ||

                          (number instanceof BigInteger &&

                           ((BigInteger)number).bitLength () < )) {

                   return format(((Number)number).longValue(), toAppendTo, pos);

               } else if (number instanceof BigDecimal) {

                   return format((BigDecimal)number, toAppendTo, pos);

               } else if (number instanceof BigInteger) {

                   return format((BigInteger)number, toAppendTo, pos);

               } else if (number instanceof Number) {

                   return format(((Number)number).doubleValue(), toAppendTo, pos);

               } else {

                   throw new IllegalArgumentException("Cannot format given Object as a Number");

               }

           }

JAVA实现计算器功能

       çœ‹å“¥å†™çš„

       import java.awt.BorderLayout;

       import java.awt.GridLayout;

       import java.awt.event.MouseEvent;

       import java.awt.event.MouseListener;

       import java.text.DecimalFormat;

       import javax.swing.JButton;

       import javax.swing.JFrame;

       import javax.swing.JPanel;

       import javax.swing.JTextField;

       public class Calculator {

        //计算器面板

        private JFrame f = new JFrame("Calculator");

        //输入面扳

        private JPanel inputPanel = new JPanel();

        //加减乘除面板

        private JPanel operationPanel = new JPanel();

        //数字面板

        private JPanel buttonsPanel = new JPanel();

        //输入数据文本框

        private JTextField input = new JTextField();

        //退格键

        private JButton backspace = new JButton("BackSpace");

        //清空

        private JButton CE = new JButton("CE ");

        //删除

        private JButton C = new JButton("C ");

        //四则运算符号键

        private JButton add = new JButton("+");

        private JButton sub = new JButton("-");

        private JButton mul = new JButton("*");

        private JButton div = new JButton("/");

        //小数点

        private JButton decimal = new JButton(".");

        //等号

        private JButton equal = new JButton("=");

        //数字键

        private JButton zero = new JButton("0");

        private JButton one = new JButton("1");

        private JButton two = new JButton("2");

        private JButton three = new JButton("3");

        private JButton four = new JButton("4");

        private JButton five = new JButton("5");

        private JButton six = new JButton("6");

        private JButton seven = new JButton("7");

        private JButton eight = new JButton("8");

        private JButton nine = new JButton("9");

        private String num1 = "";//保存第一个运算数字

        private String operator = "";//保存运算符号

        public static void main(String[] args) {

        new Calculator();//new计算器实例

        }

        public Calculator(){

        //添加组件，布局

        inputPanel.add(input);

        f.add(inputPanel, BorderLayout.NORTH);

        operationPanel.add(backspace);

        operationPanel.add(CE);

        operationPanel.add(C);

        f.add(operationPanel, BorderLayout.CENTER);

        buttonsPanel.add(add);

        buttonsPanel.add(sub);

        buttonsPanel.add(mul);

        buttonsPanel.add(div);

        buttonsPanel.add(one);

        buttonsPanel.add(two);

        buttonsPanel.add(three);

        buttonsPanel.add(zero);

        buttonsPanel.add(four);

        buttonsPanel.add(five);

        buttonsPanel.add(six);

        buttonsPanel.add(decimal);

        buttonsPanel.add(seven);

        buttonsPanel.add(eight);

        buttonsPanel.add(nine);

        buttonsPanel.add(equal);

        buttonsPanel.setLayout(new GridLayout(4, 4));

        f.add(buttonsPanel, BorderLayout.SOUTH);

        //注册各个组件监听事件

        backspace.addMouseListener(new OperationMouseListener());

        CE.addMouseListener(new OperationMouseListener());

        C.addMouseListener(new OperationMouseListener());

        decimal.addMouseListener(new OperationMouseListener());

        equal.addMouseListener(new OperationMouseListener());

        //注册四则运算监听

        add.addMouseListener(new CalcMouseListener());

        sub.addMouseListener(new CalcMouseListener());

        mul.addMouseListener(new CalcMouseListener());

        div.addMouseListener(new CalcMouseListener());

        //注册数字监听事件

        zero.addMouseListener(new NumberMouseListener());

        one.addMouseListener(new NumberMouseListener());

        two.addMouseListener(new NumberMouseListener());

        three.addMouseListener(new NumberMouseListener());

        four.addMouseListener(new NumberMouseListener());

        five.addMouseListener(new NumberMouseListener());

        six.addMouseListener(new NumberMouseListener());

        seven.addMouseListener(new NumberMouseListener());

        eight.addMouseListener(new NumberMouseListener());

        nine.addMouseListener(new NumberMouseListener());

        f.setVisible(true);

        f.pack();

        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        }

        private class NumberMouseListener implements MouseListener{

        public void mouseClicked(MouseEvent e) {

        if(input.getText().trim().equals("0")){ //如果文本框已经是0，结果还是0

        input.setText(((JButton)e.getSource()).getText().trim());

        }else{ //否则的话，把0添加到后面，譬如文本框是1，结果就为

        input.setText(input.getText().concat(((JButton)e.getSource()).getText().trim()));

        }

        }

        public void mouseEntered(MouseEvent e) { }

        public void mouseExited(MouseEvent e) { }

        public void mousePressed(MouseEvent e) { }

        public void mouseReleased(MouseEvent e) { }

        }

        private class CalcMouseListener implements MouseListener{

        //如果输入的是运算符号，保存第一个结果和运算符号

        public void mouseClicked(MouseEvent e) {

        num1 = input.getText().trim();input.setText("");

        operator = ((JButton)e.getSource()).getText().trim();

        }

        public void mouseEntered(MouseEvent e) { }

        public void mouseExited(MouseEvent e) { }

        public void mousePressed(MouseEvent e) { }

        public void mouseReleased(MouseEvent e) { }

        }

        private class OperationMouseListener implements MouseListener{

        public void mouseClicked(MouseEvent e) {

        if(e.getSource() == backspace){ //退格键，删除一个直到没有字符删除

        String inputText = input.getText();

        if(inputText.length() > 0){

        input.setText(inputText.substring(0, inputText.length() - 1));

        }

        }else if(e.getSource() == C){

        input.setText("0");//C，清空所有运算数字和符号

        num1 = "";

        }else if(e.getSource() == CE){

        input.setText("0");//CE-->将文本框置为0

        }else if(e.getSource() == decimal){

        String text = input.getText().trim();

        //如果按了小数点，如果文本框已经有小数点，不做任何操作，否则在结果后面加上小数点

        if(text.indexOf(".") == -1){

        input.setText(text.concat("."));

        }

        }else if(e.getSource() == equal){

        //如果是等号

        if(!operator.trim().equals("")){

        if(!input.getText().trim().equals("")){

        double result = 0D;

        if(operator.equals("+")){ //执行加法运算

        result = Double.parseDouble(num1) + Double.parseDouble(input.getText().trim());

        }else if(operator.equals("-")){ //减法运算

        result = Double.parseDouble(num1) - Double.parseDouble(input.getText().trim());

        }else if(operator.equals("*")){ //乘法运算

        result = Double.parseDouble(num1) * Double.parseDouble(input.getText().trim());

        }else if(operator.equals("/")){ //除法运算

        result = Double.parseDouble(num1) / Double.parseDouble(input.getText().trim());

        }

        //格式化最终结果，保留两位小数点

        input.setText(new DecimalFormat("0.").format(result));

        }

        }

        }

        }

        public void mouseEntered(MouseEvent e) { }

        public void mouseExited(MouseEvent e) { }

        public void mousePressed(MouseEvent e) { }

        public void mouseReleased(MouseEvent e) { }

        }

       }