Merge pull request #27 from onlyliuxin/master

请组长pull以下刘欣老师的repo

group03/1196051822/3月13日作业的代码/src/download/api/ConnectionException.java

@@ -2,4 +2,12 @@
 
 public class ConnectionException extends Exception {
 
+	/**
+	 * 自定义异常错误
+	 * @param string
+	 */
+	public ConnectionException(String string) {
+
+	}
+
 }

group03/1196051822/3月13日作业的代码/src/download/api/DownloadListener.java

@@ -1,5 +1,6 @@
 package com.coderising.download.api;
 
 public interface DownloadListener {
+
 	public void notifyFinished();
 }

group04/1020483199/1020483199Learning/.classpath

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <classpath>
 	<classpathentry kind="src" path="src"/>
-	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
 	<classpathentry kind="con" path="org.eclipse.jdt.junit.JUNIT_CONTAINER/4"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
 	<classpathentry kind="output" path="bin"/>
 </classpath>

group04/1020483199/FourthHomeWork/src/com/coderising/jvm/loader/ClassFileLoader.java

@@ -0,0 +1,92 @@
+package com.coderising.jvm.loader;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+
+
+public class ClassFileLoader {
+
+	private List<String> clzPaths = new ArrayList<String>();
+
+	public byte[] readBinaryCode(String className) {
+		/**
+		 * class文件存储位置
+		 */
+		String location = clzPaths.get(0);
+		File file = new File(location);
+		File[] files = file.listFiles();
+		InputStream in = null;
+		byte[] bt = null;
+
+		int size = 0;
+		for(File fileSon:files){
+			/**
+			 * 判断出为class文件时
+			 */
+			if(fileSon.isFile() && fileSon.getName().endsWith("EmployeeV1.class")){
+				try {
+					long length = fileSon.length();
+					bt = new byte[(int) length];
+					byte[] context = new byte[1024];
+					in = new FileInputStream(fileSon);
+					int tempbyte;
+					while((tempbyte = in.read(context)) != -1){
+						for(int i = 0;i < context.length;i++){
+							System.arraycopy(context, 0, bt, size, tempbyte);
+						}
+						size = tempbyte;
+					}
+
+				} catch (FileNotFoundException e) {
+					e.printStackTrace();
+				} catch (IOException e) {
+					e.printStackTrace();
+				}finally{
+					if(in != null){
+						try {
+							in.close();
+						} catch (IOException e) {
+						}
+					}
+				}
+
+			}
+		}
+		return bt;	
+	}
+
+
+	public void addClassPath(String path) {
+
+		clzPaths.add(path);
+
+	}
+
+
+
+	public String getClassPath(){
+		StringBuilder sb = new StringBuilder();
+		for(int i = 0;i < clzPaths.size();i++){
+			if(i == clzPaths.size() - 1){
+				sb.append(clzPaths.get(i));
+				break;
+			}
+			sb.append(clzPaths.get(i)).append(";");
+
+		}
+		return sb.toString();
+	}
+
+
+
+
+
+}

group04/1020483199/FourthHomeWork/src/com/coderising/jvm/test/ClassFileloaderTest.java

@@ -0,0 +1,91 @@
+package com.coderising.jvm.test;
+
+import org.junit.After;
+import  org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+import com.coderising.jvm.loader.ClassFileLoader;
+
+
+
+
+
+public class ClassFileloaderTest {
+
+
+	static String path1 = "F:/myGithub/coding2017/group04/1020483199/FourthHomeWork/bin/com/coderising/jvm/test";
+	static String path2 = "C:/temp";
+
+
+
+	@Before
+	public void setUp() throws Exception {		 
+	}
+
+	@After
+	public void tearDown() throws Exception {
+	}
+
+	@Test
+	public void testClassPath(){		
+
+		ClassFileLoader loader = new ClassFileLoader();
+		loader.addClassPath(path1);
+		loader.addClassPath(path2);
+
+		String clzPath = loader.getClassPath();
+		Assert.assertEquals(path1+";"+path2,clzPath);
+
+	}
+
+	@Test
+	public void testClassFileLength() {		
+
+		ClassFileLoader loader = new ClassFileLoader();
+
+		loader.addClassPath(path1);
+
+		String className = "com.coderising.jvm.test.EmployeeV1";
+
+		byte[] byteCodes = loader.readBinaryCode(className);
+		// 注意：这个字节数可能和你的JVM版本有关系， 你可以看看编译好的类到底有多大
+		Assert.assertEquals(1056, byteCodes.length);
+
+	}
+
+
+    @Test	
+	public void testMagicNumber(){
+    	ClassFileLoader loader = new ClassFileLoader();
+		loader.addClassPath(path1);
+		String className = "com.coderising.jvm.test.EmployeeV1";
+		byte[] byteCodes = loader.readBinaryCode(className);
+		byte[] codes = new byte[]{byteCodes[0],byteCodes[1],byteCodes[2],byteCodes[3]};
+
+
+		String acctualValue = this.byteToHexString(codes);
+
+		Assert.assertEquals("cafebabe", acctualValue);
+	}
+
+
+
+
+
+
+	private String byteToHexString(byte[] codes ){
+		StringBuffer buffer = new StringBuffer();
+		for(int i=0;i<codes.length;i++){
+			byte b = codes[i];
+			int value = b & 0xFF;
+			String strHex = Integer.toHexString(value);
+			if(strHex.length()< 2){
+				strHex = "0" + strHex;
+			}		
+			buffer.append(strHex);
+		}
+		return buffer.toString();
+	}
+
+}

group04/1020483199/FourthHomeWork/src/com/coderising/jvm/test/EmployeeV1.java

@@ -0,0 +1,28 @@
+package com.coderising.jvm.test;
+
+public class EmployeeV1 {
+
+
+	private String name;
+    private int age;
+
+    public EmployeeV1(String name, int age) {
+        this.name = name;
+        this.age = age;        
+    }    
+
+    public void setName(String name) {
+        this.name = name;
+    }
+    public void setAge(int age){
+    	this.age = age;
+    }
+    public void sayHello() {        
+    	System.out.println("Hello , this is class Employee ");    	
+    }
+    public static void main(String[] args){
+    	EmployeeV1 p = new EmployeeV1("Andy",29);
+    	p.sayHello();    
+
+    }
+}

group04/1020483199/FourthHomeWork/src/com/coding/basic/linkedList/Iterator.java

@@ -0,0 +1,7 @@
+package com.coding.basic.linkedList;
+
+public interface Iterator {
+	public boolean hasNext();
+	public Object next();
+
+}

group04/1020483199/FourthHomeWork/src/com/coding/basic/linkedList/LRUPageFrame.java

@@ -0,0 +1,141 @@
+package com.coding.basic.linkedList;
+
+/**
+ * 用双向链表实现LRU算法
+ * @author liuxin
+ *
+ */
+public class LRUPageFrame {
+
+	private static int stateAtHead = 0;
+	private static int stateAtLast = 1;
+	private static int stateAtMid = 2;
+
+	private static class Node {
+
+		Node prev;
+		Node next;
+		int pageNum;
+
+		Node(){
+
+		}
+	}
+
+	private int capacity;
+
+	private int size;
+	private Node first;// 链表头
+	private Node last;// 链表尾
+
+
+	public LRUPageFrame(int capacity) {
+
+		this.capacity = capacity;
+
+	}
+
+	/**
+	 * 获取缓存中对象
+	 * 
+	 * @param key
+	 * @return
+	 */
+	public void access(int pageNum) {
+		/**
+		 * 空链表
+		 */
+		size ++;
+		Node newNode = new Node();
+		newNode.pageNum = pageNum;
+		if(size <= capacity){
+			if(last == null){
+				last= newNode;
+				first = newNode;
+			}else{
+				Node preHead = first;//记录原来的头节点
+				first = newNode;
+				first.next = preHead;
+				preHead.prev = first;
+			}
+		}else{
+			Node currentNode = first;
+			int judgeNum = currentNode.pageNum;
+			Node preHead = first;//记录原来的头节点
+			Node preLast = last;//记录原来的尾节点
+			int state = -1;//记录当前状态
+			/**
+			 * 当前插入的值为等于链表头的位置
+			 */
+
+			int k = 0;
+			if(judgeNum == pageNum){
+				state = stateAtHead;
+			}else if(preLast.pageNum == pageNum){
+				state = stateAtLast;
+			}
+			while(currentNode != null && k < capacity - 1){
+				k++;
+				currentNode = currentNode.next;
+				judgeNum = currentNode.pageNum;
+				if(judgeNum == pageNum && judgeNum != preLast.pageNum){
+					state = stateAtMid;
+					break;
+				}
+			}
+
+			switch (state) {
+			case -1:
+				first = newNode;
+				last = preLast.prev;
+				first.next = preHead;
+				first.prev = null;
+				preHead.next = last;
+				preHead.prev = first;
+				last.next = null;
+				break;
+			case 0:
+
+				break;
+
+			case 1:
+				last = preLast.prev;
+				last.next = null;//原来尾节点的上一个节点变成了尾节点
+				first = newNode;
+				first.prev = null;
+				first.next = preHead;
+				break;
+			case 2:
+				first = newNode;
+				first.next = preHead;
+				first.prev = null;
+				preHead.next = last;
+				preHead.prev = first;
+				last.prev = preHead;
+				break;
+			}
+
+		}
+
+
+
+
+	}
+
+
+
+	public String toString(){
+		StringBuilder buffer = new StringBuilder();
+		Node node = first;
+		while(node != null){
+			buffer.append(node.pageNum);			
+
+			node = node.next;
+			if(node != null){
+				buffer.append(",");
+			}
+		}
+		return buffer.toString();
+	}
+
+}