test

Calculator/calculator

@@ -0,0 +1,317 @@
+
+package Cal;
+
+import java.awt.*;
+import java.awt.event.*;
+import javax.swing.*;
+import java.util.Vector;
+
+public class Calculator {
+
+    String str1 = "0"; // 运算数1 初值一定为0 为了程序的安全
+    String str2 = "0"; // 运算数2
+    String signal = "+"; // 运算符
+    String result = "";// 结果
+
+    // 状态开关
+    int k1 = 1;// 开关1 用于选择输入方向 将要写入str2或 str2
+    int k2 = 1;// 开关2 符号键 次数 k2>1说明进行的是2+3-9+8 这样的多符号运算
+    int k3 = 1;// 开关3 str1 是否可以被清0 ==1时可以 !=1时不能被清0
+    int k4 = 1;// 开关4 str2 同上
+    int k5 = 1;// 开关5 控制小数点可否被录入 ==1时可以 !=1 输入的小数点被丢掉
+    JButton store; // 寄存器 记录 是否连续按下符号键
+    @SuppressWarnings("rawtypes")
+    Vector vt = new Vector(20, 10);
+
+    JFrame frame = new JFrame("计算器");
+    JTextField result_TextField = new JTextField(result, 20);// 20列
+    JButton clear_Button = new JButton("清除");
+    JButton button0 = new JButton("0");
+    JButton button1 = new JButton("1");
+    JButton button2 = new JButton("2");
+    JButton button3 = new JButton("3");
+    JButton button4 = new JButton("4");
+    JButton button5 = new JButton("5");
+    JButton button6 = new JButton("6");
+    JButton button7 = new JButton("7");
+    JButton button8 = new JButton("8");
+    JButton button9 = new JButton("9");
+    JButton button_Dian = new JButton(".");
+    JButton button_jia = new JButton("+");
+    JButton button_jian = new JButton("-");
+    JButton button_cheng = new JButton("*");
+    JButton button_chu = new JButton("/");
+    JButton button_dy = new JButton("=");
+
+    Calculator() {
+        button0.setMnemonic(KeyEvent.VK_0);// 等效键
+        // 其它 等效键 略,
+
+        result_TextField.setHorizontalAlignment(JTextField.RIGHT);// 文本框 右对齐
+
+        JPanel pan = new JPanel();
+        pan.setLayout(new GridLayout(4, 4, 5, 5));// 四行四列 边距为5像素
+        pan.add(button7);
+        pan.add(button8);
+        pan.add(button9);
+        pan.add(button_chu);
+        pan.add(button4);
+        pan.add(button5);
+        pan.add(button6);
+        pan.add(button_cheng);
+        pan.add(button1);
+        pan.add(button2);
+        pan.add(button3);
+        pan.add(button_jian);
+        pan.add(button0);
+        pan.add(button_Dian);
+        pan.add(button_dy);
+        pan.add(button_jia);
+        pan.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));// pan对象的边距
+
+        JPanel pan2 = new JPanel();
+        pan2.setLayout(new BorderLayout());
+        pan2.add(result_TextField, BorderLayout.WEST);
+        pan2.add(clear_Button, BorderLayout.EAST);
+
+        frame.setLocation(300, 200); // 主窗口 出现在位置
+        frame.setResizable(false); // 不能调大小
+        frame.getContentPane().setLayout(new BorderLayout());
+        frame.getContentPane().add(pan2, BorderLayout.NORTH);
+        frame.getContentPane().add(pan, BorderLayout.CENTER);
+
+        frame.pack();
+        frame.setVisible(true);
+
+        // 事件处理 程 序
+
+        // 数 字 键
+        class Listener implements ActionListener {
+            @SuppressWarnings("unchecked")
+            public void actionPerformed(ActionEvent e) {
+                String ss = ((JButton) e.getSource()).getText();
+                store = (JButton) e.getSource();
+                vt.add(store);
+                if (k1 == 1) {
+                    if (k3 == 1) {
+                        str1 = "";
+                        k5 = 1;// 还原开关k5状态
+                    }
+                    str1 = str1 + ss;
+
+                    k3 = k3 + 1;
+
+                    result_TextField.setText(str1);// 显示
+
+                } else if (k1 == 2) {
+                    if (k4 == 1) {
+                        str2 = "";
+                        k5 = 1; // 还原开关k5状态
+                    }
+                    str2 = str2 + ss;
+                    k4 = k4 + 1;
+                    result_TextField.setText(str2);
+                }
+
+            }
+        }
+
+        // 符 号
+        class Listener_signal implements ActionListener {
+            @SuppressWarnings("unchecked")
+            public void actionPerformed(ActionEvent e) {
+                String ss2 = ((JButton) e.getSource()).getText();
+                store = (JButton) e.getSource();
+                vt.add(store);
+
+                if (k2 == 1) {
+                    k1 = 2;// 开关 k1 为1时,向数1写 为2时，向数2写
+                    k5 = 1;
+                    signal = ss2;
+                    k2 = k2 + 1;// 按符号键的次数
+                } else {
+                    int a = vt.size();
+                    JButton c = (JButton) vt.get(a - 2);
+
+                    if (!(c.getText().equals("+"))
+                            && !(c.getText().equals("-"))
+                            && !(c.getText().equals("*"))
+                            && !(c.getText().equals("/")))
+
+                    {
+                        cal();
+                        str1 = result;
+                        k1 = 2;// 开关 k1 为1时,向数1写 为2时，向数2写
+                        k5 = 1;
+                        k4 = 1;
+                        signal = ss2;
+                    }
+                    k2 = k2 + 1;
+
+                }
+
+            }
+        }
+
+        // 清除
+        class Listener_clear implements ActionListener {
+            @SuppressWarnings("unchecked")
+            public void actionPerformed(ActionEvent e) {
+                store = (JButton) e.getSource();
+                vt.add(store);
+                k5 = 1;
+                k2 = 1;
+                k1 = 1;
+                k3 = 1;
+                k4 = 1;
+                str1 = "0";
+                str2 = "0";
+                signal = "";
+                result = "";
+                result_TextField.setText(result);
+                vt.clear();
+            }
+        }
+
+        // 等 于
+        class Listener_dy implements ActionListener {
+            @SuppressWarnings("unchecked")
+            public void actionPerformed(ActionEvent e) {
+
+                store = (JButton) e.getSource();
+                vt.add(store);
+                cal();
+                k1 = 1; // 还原开关k1状态
+                // str1=result;
+                k2 = 1;
+                k3 = 1;// 还原开关k3状态
+                k4 = 1; // 还原开关k4状态
+
+                str1 = result; // 为7+5=12 +5=17 这种计算做准备
+            }
+        }
+        // 小数点
+        class Listener_xiaos implements ActionListener {
+            @SuppressWarnings("unchecked")
+            public void actionPerformed(ActionEvent e) {
+                store = (JButton) e.getSource();
+                vt.add(store);
+                if (k5 == 1) {
+                    String ss2 = ((JButton) e.getSource()).getText();
+                    if (k1 == 1) {
+                        if (k3 == 1) {
+                            str1 = "";
+                            k5 = 1; // 还原开关k5状态
+                        }
+                        str1 = str1 + ss2;
+
+                        k3 = k3 + 1;
+
+                        result_TextField.setText(str1);// 显示
+
+                    } else if (k1 == 2) {
+                        if (k4 == 1) {
+                            str2 = "";
+                            k5 = 1; // 还原开关k5状态
+                        }
+                        str2 = str2 + ss2;
+
+                        k4 = k4 + 1;
+
+                        result_TextField.setText(str2);
+                    }
+                }
+
+                k5 = k5 + 1;
+            }
+        }
+
+        // 注册 监听器
+        Listener_dy jt_dy = new Listener_dy();
+        Listener jt = new Listener();// 临听数字键
+        Listener_signal jt_signal = new Listener_signal();// 临 听符 号键
+        Listener_clear jt_c = new Listener_clear(); // 清除键
+        Listener_xiaos jt_xs = new Listener_xiaos();// 小数点 键
+
+        button7.addActionListener(jt);
+        button8.addActionListener(jt);
+        button9.addActionListener(jt);
+        button_chu.addActionListener(jt_signal);
+        button4.addActionListener(jt);
+        button5.addActionListener(jt);
+        button6.addActionListener(jt);
+        button_cheng.addActionListener(jt_signal);
+        button1.addActionListener(jt);
+        button2.addActionListener(jt);
+        button3.addActionListener(jt);
+        button_jian.addActionListener(jt_signal);
+        button0.addActionListener(jt);
+        button_Dian.addActionListener(jt_xs);
+        button_dy.addActionListener(jt_dy);
+        button_jia.addActionListener(jt_signal);
+        clear_Button.addActionListener(jt_c);
+
+        // 关闭事件处理程序
+        frame.addWindowListener(new WindowAdapter() {
+            public void windowClosing(WindowEvent e) {
+                System.exit(0);
+            }
+        });
+
+    }
+
+    // 计 算
+    public void cal() {
+        double a2;// 运算数1
+        double b2;// 运算数2
+        String c = signal;// 运算符
+        double result2 = 0;// 结果
+
+        if (c.equals("")) {
+            result_TextField.setText("请输入运算符");
+
+        } else {
+
+            if (str1.equals(".")) // 字符串 "." 转换成double型数据时 会出错 所以手工转
+                str1 = "0.0";
+            if (str2.equals("."))
+                str2 = "0.0";
+            a2 = Double.valueOf(str1).doubleValue();
+            b2 = Double.valueOf(str2).doubleValue();
+
+            if (c.equals("+")) {
+                result2 = a2 + b2;
+            }
+            if (c.equals("-")) {
+                result2 = a2 - b2;
+            }
+            if (c.equals("*")) {
+                result2 = a2 * b2;
+            }
+            if (c.equals("/")) {
+                if (b2 == 0) {
+                    result2 = 0;
+                } else {
+                    result2 = a2 / b2;
+                }
+
+            }
+
+            result = ((new Double(result2)).toString());
+
+            result_TextField.setText(result);
+        }
+    }
+
+    @SuppressWarnings("unused")
+    public static void main(String[] args) {
+        // 界面风格，可以去除
+    try {
+                    UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+        Calculator cal = new Calculator();
+    }
+
+}

EnumTest

@@ -0,0 +1,41 @@
+import java.util.Scanner;
+import javax.print.attribute.Size2DSyntax;
+
+public class EnumTest {
+	/**
+	 * @param args
+	 */
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+
+    Scanner in = new Scanner(System.in);
+    System.out.print("Enter a  size: (SMALL, MEDIUM, LARGE, EXTRA_LARGE) " );
+    String input = in.next().toUpperCase();
+    Size size = Enum.valueOf(Size.class, input);
+    System.out.println("size=" + size);
+    System.out.println("abbreviation = " + size.getAbbreviation() );
+    if(size == Size.EXTRA_LARGE)
+    	System.out.println("Good job--you paid attention to the _.");
+	}
+}
+
+enum Size
+{
+    SMALL("S"), MEDINUM("M"), LARGE("L"), EXTRA_LARGE("XL");
+
+    private Size(String abbreviation) { this.abbreviation = abbreviation ;}
+    public String getAbbreviation()   { return abbreviation ; }
+
+    private String abbreviation;     
+}
+
+<<<<<<< HEAD
+=======
+
+Result:
+Enter a  size: (SMALL, MEDIUM, LARGE, EXTRA_LARGE) 
+SMALL
+size=SMALL
+abbreviation = S
+
+>>>>>>> 476af50a180fb67ef1fab84eca2198b5b4bfac6b

FileTest

@@ -0,0 +1,34 @@
+import java.io.File;
+import java.io.IOException;
+import java.lang.reflect.Field;
+
+public class TestFile {
+	public static void main(String[] args)  throws IOException
+	{
+         File dir = new File("\\root");
+         File f1 = new File(dir, "fileOne.txt");
+         File f2 = new File(dir, "fileTwo.java");
+         //文件对象创建后，指定的文件或目录不一定物理上存在
+         if(!dir.exists())
+        	 dir.mkdir();
+         if(!f1.exists())
+        	 f1.createNewFile();
+         if(!f2.exists())
+        	 f2.createNewFile();
+	     System.out.println("f1's AbsolutePath= " + f1.getAbsolutePath());
+	     System.out.println("f1 canread= " + f1.canRead());
+	     System.out.println("f1's len = " + f1.length());
+	     String[] FL;
+	     int count = 0;
+	     FL = dir.list();
+	     for(int i=0; i<FL.length; i++){
+	    	 count++;
+	         System.out.println(FL[i] + " is in " +"//root");
+	     }
+	     System.out.println("there are" + count + "file in //root");
+     }
+}
+<<<<<<< HEAD
+
+=======
+>>>>>>> 476af50a180fb67ef1fab84eca2198b5b4bfac6b