diff --git a/group15/1521_653895972/src/task4/jvm/loader/ClassFileLoader.java b/group15/1521_653895972/src/task4/jvm/loader/ClassFileLoader.java
index cdecffed32..440341fda4 100644
--- a/group15/1521_653895972/src/task4/jvm/loader/ClassFileLoader.java
+++ b/group15/1521_653895972/src/task4/jvm/loader/ClassFileLoader.java
@@ -1,5 +1,7 @@
 package task4.jvm.loader;
 
+import org.apache.commons.lang3.StringUtils;
+
 import java.io.BufferedInputStream;
 import java.io.ByteArrayOutputStream;
 import java.io.File;
@@ -15,10 +17,7 @@ public class ClassFileLoader {
 	private List<String> clzPaths = new ArrayList<String>();
 	
 	public byte[] readBinaryCode(String className) throws Exception {
-		URL base = this.getClass().getResource("/");
-		String baseToString = ""+base;
-		String filePath = baseToString.replaceAll("file:/", "")+className.replace(".", "\\")+".class";
-		//String filePath = clzPaths.get(0)+"\\"+className.replace(".", "\\")+".class";  //符合Junit测试调用addClassPath方法
+		String filePath = clzPaths.get(0)+File.separatorChar+className.replace('.',File.separatorChar)+".class";
 		File file = new File(filePath);
 		
 		BufferedInputStream bis = new BufferedInputStream(new FileInputStream(file));
@@ -33,19 +32,13 @@ public byte[] readBinaryCode(String className) throws Exception {
 	}
 	
 	public void addClassPath(String path) {
+		if (clzPaths.contains(path))
+			return;
 		clzPaths.add(path);
 	}
 		
 	public String getClassPath(){
-		StringBuffer strBuffer = new StringBuffer();
-		for(int i=0;i<clzPaths.size();i++){
-			if(i == (clzPaths.size() - 1)){
-				strBuffer.append(clzPaths.get(i));
-			}else{
-				strBuffer.append(clzPaths.get(i)+";");
-			}
-		}
-		return strBuffer.toString();
+		return StringUtils.join(clzPaths,";");
 	}
 
 }
diff --git a/group15/1521_653895972/src/task4/jvm/test/ClassFileloaderTest.java b/group15/1521_653895972/src/task4/jvm/test/ClassFileloaderTest.java
index 863fb85228..5b037ffe5d 100644
--- a/group15/1521_653895972/src/task4/jvm/test/ClassFileloaderTest.java
+++ b/group15/1521_653895972/src/task4/jvm/test/ClassFileloaderTest.java
@@ -10,7 +10,7 @@
 public class ClassFileloaderTest {
 
 	
-	static String path1 = "D:\\GitHub\\coding2017\\group01\\1814014897\\zhouhui\\bin";
+	static String path1 = "D:\\oneces\\GitHub\\coding2017\\group15\\1521_653895972\\out\\production\\1521_653895972";
 	static String path2 = "C:\temp";
 	
 	
@@ -31,7 +31,6 @@ public void testClassPath(){
 		loader.addClassPath(path2);
 		
 		String clzPath = loader.getClassPath();
-		
 		Assert.assertEquals(path1+";"+path2,clzPath);
 		
 	}
@@ -42,12 +41,12 @@ public void testClassFileLength() throws Exception {
 		ClassFileLoader loader = new ClassFileLoader();
 		loader.addClassPath(path1);
 		
-		String className = "week04.jvm.test.EmployeeV1";
+		String className = "task4.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(1040, byteCodes.length);
+		Assert.assertEquals(1038, byteCodes.length);
 		
 	}
 	
@@ -56,7 +55,7 @@ public void testClassFileLength() throws Exception {
 	public void testMagicNumber() throws Exception{
     	ClassFileLoader loader = new ClassFileLoader();
 		loader.addClassPath(path1);
-		String className = "week04.jvm.test.EmployeeV1";
+		String className = "task4.jvm.test.EmployeeV1";
 		byte[] byteCodes = loader.readBinaryCode(className);
 		byte[] codes = new byte[]{byteCodes[0],byteCodes[1],byteCodes[2],byteCodes[3]};
 		
diff --git a/group15/1521_653895972/src/task4/jvm/test/EmployeeV1.java b/group15/1521_653895972/src/task4/jvm/test/EmployeeV1.java
index 3e11fe6ccb..e8e8cd385a 100644
--- a/group15/1521_653895972/src/task4/jvm/test/EmployeeV1.java
+++ b/group15/1521_653895972/src/task4/jvm/test/EmployeeV1.java
@@ -1,4 +1,4 @@
-package week04.jvm.test;
+package task4.jvm.test;
 
 public class EmployeeV1 {
 	
diff --git a/group15/1521_653895972/src/task4/linklist/LRUPageFrame.java b/group15/1521_653895972/src/task4/linklist/LRUPageFrame.java
index 6c2a61eaca..daf58b1d74 100644
--- a/group15/1521_653895972/src/task4/linklist/LRUPageFrame.java
+++ b/group15/1521_653895972/src/task4/linklist/LRUPageFrame.java
@@ -29,7 +29,7 @@ public LRUPageFrame(int capacity) {
     /**
      * 获取缓存中对象
      *
-     * @param key
+     * @param pageNum
      * @return
      */
     public void access(int pageNum) {
diff --git a/group15/1521_653895972/src/task5/jvm/test/ClassFileloaderTest.java b/group15/1521_653895972/src/task5/jvm/test/ClassFileloaderTest.java
index 3a74f57474..3c6fa84151 100644
--- a/group15/1521_653895972/src/task5/jvm/test/ClassFileloaderTest.java
+++ b/group15/1521_653895972/src/task5/jvm/test/ClassFileloaderTest.java
@@ -13,16 +13,16 @@
 public class ClassFileloaderTest {
 
 	
-	private static final String FULL_QUALIFIED_CLASS_NAME = "com/coderising/jvm/test/EmployeeV1";
+	private static final String FULL_QUALIFIED_CLASS_NAME = "task5.jvm.test.EmployeeV1";
 	
-	static String path1 = "C:\\Users\\liuxin\\git\\coding2017\\liuxin\\mini-jvm\\bin";
+	static String path1 = "D:\\oneces\\GitHub\\coding2017\\group15\\1521_653895972\\out\\production\\1521_653895972";
 	static String path2 = "C:\temp";
 	
 	static ClassFile clzFile = null;
 	static {
 		ClassFileLoader loader = new ClassFileLoader();
 		loader.addClassPath(path1);
-		String className = "com.coderising.jvm.test.EmployeeV1";
+		String className = "task5.jvm.test.EmployeeV1";
 		
 		clzFile = loader.loadClass(className);
 		clzFile.print();
@@ -56,7 +56,7 @@ public void testClassFileLength() {
 		ClassFileLoader loader = new ClassFileLoader();
 		loader.addClassPath(path1);
 		
-		String className = "com.coderising.jvm.test.EmployeeV1";
+		String className = "task5.jvm.test.EmployeeV1";
 		
 		byte[] byteCodes = loader.readBinaryCode(className);
 		
@@ -70,7 +70,7 @@ public void testClassFileLength() {
 	public void testMagicNumber(){
     	ClassFileLoader loader = new ClassFileLoader();
 		loader.addClassPath(path1);
-		String className = "com.coderising.jvm.test.EmployeeV1";
+		String className = "task5.jvm.test.EmployeeV1";
 		byte[] byteCodes = loader.readBinaryCode(className);
 		byte[] codes = new byte[]{byteCodes[0],byteCodes[1],byteCodes[2],byteCodes[3]};
 		
diff --git "a/\357\274\201" "b/\357\274\201"
deleted file mode 100644
index 8e1902e358..0000000000
--- "a/\357\274\201"
+++ /dev/null
@@ -1,8 +0,0 @@
-Merge branch 'master' of https://github.com/jodie-zss/coding2017 into jodie-zss/master
-update orgin
-
-# Please enter a commit message to explain why this merge is necessary,
-# especially if it merges an updated upstream into a topic branch.
-#
-# Lines starting with '#' will be ignored, and an empty message aborts
-# the commit.