Merge pull request onlyliuxin#61 from Ren650119726/master

 102228177 第五次作业

group17/102228177/work2_26/.classpath

@@ -1,8 +1,8 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<classpath>
-	<classpathentry kind="src" path="src"/>
-	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.7"/>
-	<classpathentry kind="con" path="org.eclipse.jdt.junit.JUNIT_CONTAINER/4"/>
-	<classpathentry kind="lib" path="lib/dom4j-1.6.jar"/>
-	<classpathentry kind="output" path="bin"/>
-</classpath>
+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="src" path="src"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.7"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.junit.JUNIT_CONTAINER/4"/>
+	<classpathentry kind="lib" path="lib/dom4j-1.6.1.jar"/>
+	<classpathentry kind="output" path="bin"/>
+</classpath>

group17/102228177/work2_26/src/com/coderising/array/ArrayUtil.java

@@ -34,7 +34,7 @@ public static void main(String[] args) {
 //		System.out.println(Arrays.toString(util.merge(a1, a2)));
 		System.out.println(Arrays.toString(util.fibonacci(15)));
 
-		System.out.println(Arrays.toString(util.getPrimes(23)));
+//		System.out.println(Arrays.toString(util.getPrimes(23)));
 	}
 
 	/**
@@ -115,14 +115,15 @@ public int[] grow(int [] oldArray,  int size){
 	 */
 	public int[] fibonacci(int max){
 		List<Integer> list = new ArrayList<Integer>();
-		int f1 = 1, f2 = 1, f = 0;
-		list.add(f1);
-		list.add(f2);
-		while(f < max){
-			f = f1+f2;
-			f1 = f2;
-			f2 = f;
-			list.add(f);
+		if (max <= 1) {
+	        return new int[]{};
+        }
+		int lo = 0;
+		int hi = 1;
+		while(hi<max){
+			list.add(hi);
+			hi = lo + hi;
+			lo = hi - lo;
 		}
 		int[] arr = new int[list.size()];
 		for (int i = 0; i < list.size(); i++) {

group17/102228177/work3_26/src/com/coderising/jvm/loader/ClassFileLoader.java

@@ -0,0 +1,81 @@
+package com.coderising.jvm.loader;
+
+import java.io.ByteArrayOutputStream;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.ArrayList;
+import java.util.List;
+
+
+
+public class ClassFileLoader {
+
+	private List<String> clzPaths = new ArrayList<String>();
+
+	public byte[] readBinaryCode(String className) {
+		String name = "";
+		for (int i = 0; i < className.length(); i++) {
+			if(className.charAt(i)=='.'){
+				name +=  File.separatorChar;
+			}else{
+				name += className.charAt(i);
+			}
+		}
+		File file = new File(getClassPath()+ File.separatorChar  +name+".class");
+		InputStream in = null;
+		ByteArrayOutputStream out = null;
+		try {
+			in = new FileInputStream(file);
+			out = new ByteArrayOutputStream();
+			byte[] buff = new byte[1024*2];
+			int len = 0;
+			while((len=in.read(buff))!=-1){
+				out.write(buff, 0, len);
+			}
+			return out.toByteArray();
+		} catch (FileNotFoundException e) {
+			e.printStackTrace();
+		} catch (IOException e) {
+			e.printStackTrace();
+		}
+		finally {
+			if(in!=null){
+				try {
+					in.close();
+				} catch (IOException e) {
+					e.printStackTrace();
+				}
+			}
+			if(out!=null){
+				try {
+					out.close();
+				} catch (IOException e) {
+					e.printStackTrace();
+				}
+			}
+		}
+
+		return null;	
+
+
+	}
+
+
+	public void addClassPath(String path) {
+		clzPaths.add(path);
+	}
+
+
+
+	public String getClassPath(){
+		StringBuilder sb = new StringBuilder();
+		for (String string : clzPaths) {
+			sb.append(string).append(";");
+		}
+		sb = sb.deleteCharAt(sb.length()-1);
+		return sb.toString();
+	}
+}

group17/102228177/work3_26/src/com/coderising/jvm/test/ClassFileloaderTest.java

@@ -0,0 +1,93 @@
+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 = "C:\\Users\\liuxin\\git\\coding2017\\liuxin\\mini-jvm\\bin";
+	static String path1 = "D:\\git\\coding2017\\group17\\102228177\\work3_26\\bin";
+	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();
+	}
+
+}

group17/102228177/work3_26/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();    
+
+    }
+}