✨添加源代码到eclipse

Author: yansheng836

.gitignore

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 # Compiled class file
 *.class
+bin/
 
 # Log file
 *.log

src/main/example10_12/ch10/例子1/Example10_1.java

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+package ch10.例子1;
+
+import java.io.File;
+import java.io.IOException;
+public class Example10_1 {
+   public static void main(String args[]) {
+      File f = new File("C:\\ch10","Example10_1.java");
+      System.out.println(f.getName()+"是可读的吗:"+f.canRead());
+      System.out.println(f.getName()+"的长度:"+f.length());
+      System.out.println(f.getName()+"的绝对路径:"+f.getAbsolutePath());
+      File file = new File("new.txt");
+      System.out.println("在当前目录下创建新文件"+file.getName());
+      if(!file.exists()) {
+         try {
+              file.createNewFile();
+              System.out.println("创建成功");
+         }
+         catch(IOException exp){}
+      }
+   }
+}

src/main/example10_12/ch10/例子10/Example10_10.java

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+package ch10.例子10;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.CharArrayReader;
+import java.io.CharArrayWriter;
+import java.io.IOException;
+
+public class Example10_10 {
+	public static void main(String args[]) {
+		try {
+			ByteArrayOutputStream outByte = new ByteArrayOutputStream();
+			byte[] byteContent = "国庆60周年".getBytes();
+			outByte.write(byteContent);
+			ByteArrayInputStream inByte = new ByteArrayInputStream(outByte.toByteArray());
+			byte backByte[] = new byte[outByte.toByteArray().length];
+			inByte.read(backByte);
+			System.out.println(new String(backByte));
+			CharArrayWriter outChar = new CharArrayWriter();
+			char[] charContent = "中秋快乐".toCharArray();
+			outChar.write(charContent);
+			CharArrayReader inChar = new CharArrayReader(outChar.toCharArray());
+			char backChar[] = new char[outChar.toCharArray().length];
+			inChar.read(backChar);
+			System.out.println(new String(backChar));
+		} catch (IOException exp) {
+		}
+	}
+}

src/main/example10_12/ch10/例子11/Example10_11.java

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+package ch10.例子11;
+
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+public class Example10_11 {
+   public static void main(String args[]) {
+      File file=new File("apple.txt");
+      try{
+          FileOutputStream fos=new FileOutputStream(file);
+          DataOutputStream outData=new DataOutputStream(fos);
+          outData.writeInt(100);
+          outData.writeLong(123456);  
+          outData.writeFloat(3.1415926f);
+          outData.writeDouble(987654321.1234);
+          outData.writeBoolean(true);
+          outData.writeChars("How are you doing ");
+       } 
+       catch(IOException e){}
+       try{
+          FileInputStream fis=new FileInputStream(file);
+          DataInputStream inData=new DataInputStream(fis);
+          System.out.println(inData.readInt());    //读取int数据
+          System.out.println(inData.readLong());   //读取long数据 
+          System.out.println(+inData.readFloat()); //读取float数据
+          System.out.println(inData.readDouble()); //读取double数据
+          System.out.println(inData.readBoolean());//读取boolean数据
+          char c;
+          while((c=inData.readChar())!='\0') {       //'\0'表示空字符。
+              System.out.print(c);
+          } 
+        }
+        catch(IOException e){}
+   }
+}

src/main/example10_12/ch10/例子12/EncryptAndDecrypt.java

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+package ch10.例子12;
+
+public class EncryptAndDecrypt {
+	String encrypt(String sourceString, String password) { // 加密算法
+		char[] p = password.toCharArray();
+		int n = p.length;
+		char[] c = sourceString.toCharArray();
+		int m = c.length;
+		for (int k = 0; k < m; k++) {
+			int mima = c[k] + p[k % n];       // 加密
+			c[k] = (char) mima;
+		}
+		return new String(c);    // 返回密文
+	}
+
+	String decrypt(String sourceString, String password) { // 解密算法
+		char[] p = password.toCharArray();
+		int n = p.length;
+		char[] c = sourceString.toCharArray();
+		int m = c.length;
+		for (int k = 0; k < m; k++) {
+			int mima = c[k] - p[k % n];       // 解密
+			c[k] = (char) mima;
+		}
+		return new String(c);    // 返回明文
+	}
+}

src/main/example10_12/ch10/例子12/Example10_12.java

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+package ch10.例子12;
+
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+
+public class Example10_12 {
+	public static void main(String args[]) {
+		String command = "度江总攻时间是4月22日晚10点";
+		EncryptAndDecrypt person = new EncryptAndDecrypt();
+		String password = "Tiger";
+		String secret = person.encrypt(command, password);
+		File file = new File("secret.txt");
+		try {
+			FileOutputStream fos = new FileOutputStream(file);
+			DataOutputStream outData = new DataOutputStream(fos);
+			outData.writeUTF(secret);
+			System.out.println("加密命令:" + secret);
+		} catch (IOException e) {
+		}
+		try {
+			FileInputStream fis = new FileInputStream(file);
+			DataInputStream inData = new DataInputStream(fis);
+			String str = inData.readUTF();
+			String mingwen = person.decrypt(str, password);
+			System.out.println("解密命令:" + mingwen);
+		} catch (IOException e) {
+		}
+	}
+}

src/main/example10_12/ch10/例子13/Example10_13.java

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+package ch10.例子13;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+
+public class Example10_13 {
+	public static void main(String args[]) {
+		TV changhong = new TV();
+		changhong.setName("长虹电视");
+		changhong.setPrice(5678);
+		File file = new File("television.txt");
+		try {
+			FileOutputStream fileOut = new FileOutputStream(file);
+			ObjectOutputStream objectOut = new ObjectOutputStream(fileOut);
+			objectOut.writeObject(changhong);
+			objectOut.close();
+			FileInputStream fileIn = new FileInputStream(file);
+			ObjectInputStream objectIn = new ObjectInputStream(fileIn);
+			TV xinfei = (TV) objectIn.readObject();
+			objectIn.close();
+			xinfei.setName("新飞电视");
+			xinfei.setPrice(6666);
+			System.out.println("changhong的名字:" + changhong.getName());
+			System.out.println("changhong的价格:" + changhong.getPrice());
+			System.out.println("xinfei的名字:" + xinfei.getName());
+			System.out.println("xinfei的价格:" + xinfei.getPrice());
+		} catch (ClassNotFoundException event) {
+			System.out.println("不能读出对象");
+		} catch (IOException event) {
+			System.out.println(event);
+		}
+	}
+}

src/main/example10_12/ch10/例子13/TV.java

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+package ch10.例子13;
+
+import java.io.Serializable;
+
+public class TV implements Serializable {
+	String name;
+	int price;
+
+	public void setName(String s) {
+		name = s;
+	}
+
+	public void setPrice(int n) {
+		price = n;
+	}
+
+	public String getName() {
+		return name;
+	}
+
+	public int getPrice() {
+		return price;
+	}
+}

src/main/example10_12/ch10/例子14/Example10_14.java

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+package ch10.例子14;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.RandomAccessFile;
+import java.nio.channels.FileChannel;
+import java.nio.channels.FileLock;
+import java.util.Scanner;
+
+public class Example10_14 {
+	public static void main(String args[]) {
+		File file = new File("Example10_14.java");
+		Scanner scanner = new Scanner(System.in);
+		try {
+			RandomAccessFile input = new RandomAccessFile(file, "rw");
+			FileChannel channel = input.getChannel();
+			FileLock lock = channel.tryLock(); // 加锁
+			System.out.println("输入要读去的行数:");
+			while (scanner.hasNextInt()) {
+				int m = scanner.nextInt();
+				lock.release();                // 解锁
+				for (int i = 1; i <= m; i++) {
+					String str = input.readLine();
+					System.out.println(str);
+				}
+				lock = channel.tryLock(); // 加锁
+				System.out.println("输入要读去的行数:");
+			}
+		} catch (IOException event) {
+			System.out.println(event);
+		}
+	}
+}

src/main/example10_12/ch10/例子15/Example10_15.java

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+package ch10.例子15;
+
+import java.io.File;
+import java.util.InputMismatchException;
+import java.util.Scanner;
+
+public class Example10_15 {
+	public static void main(String args[]) {
+		File file = new File("cost.txt");
+		Scanner sc = null;
+		int sum = 0;
+		try {
+			sc = new Scanner(file);
+			while (sc.hasNext()) {
+				try {
+					int price = sc.nextInt();
+					sum = sum + price;
+					System.out.println(price);
+				} catch (InputMismatchException exp) {
+					String t = sc.next();
+				}
+			}
+			System.out.println("Total Cost:" + sum + " dollar");
+		} catch (Exception exp) {
+			System.out.println(exp);
+		}
+	}
+}