diff --git a/testJava/.classpath b/testJava/.classpath
new file mode 100644
index 0000000..d171cd4
--- /dev/null
+++ b/testJava/.classpath
@@ -0,0 +1,6 @@
+<?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="output" path="bin"/>
+</classpath>
diff --git a/testJava/.project b/testJava/.project
new file mode 100644
index 0000000..fc56a1e
--- /dev/null
+++ b/testJava/.project
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>testJava</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>
diff --git a/testJava/bin/com/codehunt/yxiaolv/CharArrayAndString$Program.class b/testJava/bin/com/codehunt/yxiaolv/CharArrayAndString$Program.class
new file mode 100644
index 0000000..3de7ecf
Binary files /dev/null and b/testJava/bin/com/codehunt/yxiaolv/CharArrayAndString$Program.class differ
diff --git a/testJava/bin/com/codehunt/yxiaolv/CharArrayAndString$Program2.class b/testJava/bin/com/codehunt/yxiaolv/CharArrayAndString$Program2.class
new file mode 100644
index 0000000..cbb9f3e
Binary files /dev/null and b/testJava/bin/com/codehunt/yxiaolv/CharArrayAndString$Program2.class differ
diff --git a/testJava/bin/com/codehunt/yxiaolv/CharArrayAndString.class b/testJava/bin/com/codehunt/yxiaolv/CharArrayAndString.class
new file mode 100644
index 0000000..3bca0f4
Binary files /dev/null and b/testJava/bin/com/codehunt/yxiaolv/CharArrayAndString.class differ
diff --git a/testJava/bin/com/codehunt/yxiaolv/LoopTest.class b/testJava/bin/com/codehunt/yxiaolv/LoopTest.class
new file mode 100644
index 0000000..cff776e
Binary files /dev/null and b/testJava/bin/com/codehunt/yxiaolv/LoopTest.class differ
diff --git a/testJava/bin/com/codehunt/yxiaolv/RecursePower.class b/testJava/bin/com/codehunt/yxiaolv/RecursePower.class
new file mode 100644
index 0000000..850b259
Binary files /dev/null and b/testJava/bin/com/codehunt/yxiaolv/RecursePower.class differ
diff --git a/testJava/bin/com/codehunt/yxiaolv/String611$Program.class b/testJava/bin/com/codehunt/yxiaolv/String611$Program.class
new file mode 100644
index 0000000..9eab0e7
Binary files /dev/null and b/testJava/bin/com/codehunt/yxiaolv/String611$Program.class differ
diff --git a/testJava/bin/com/codehunt/yxiaolv/String611.class b/testJava/bin/com/codehunt/yxiaolv/String611.class
new file mode 100644
index 0000000..254aca6
Binary files /dev/null and b/testJava/bin/com/codehunt/yxiaolv/String611.class differ
diff --git a/testJava/bin/com/codehunt/yxiaolv/StringBufferCharArray$Program.class b/testJava/bin/com/codehunt/yxiaolv/StringBufferCharArray$Program.class
new file mode 100644
index 0000000..0cb05b4
Binary files /dev/null and b/testJava/bin/com/codehunt/yxiaolv/StringBufferCharArray$Program.class differ
diff --git a/testJava/bin/com/codehunt/yxiaolv/StringBufferCharArray.class b/testJava/bin/com/codehunt/yxiaolv/StringBufferCharArray.class
new file mode 100644
index 0000000..300beb7
Binary files /dev/null and b/testJava/bin/com/codehunt/yxiaolv/StringBufferCharArray.class differ
diff --git a/testJava/src/com/codehunt/yxiaolv/CharArrayAndString.java b/testJava/src/com/codehunt/yxiaolv/CharArrayAndString.java
new file mode 100644
index 0000000..d180433
--- /dev/null
+++ b/testJava/src/com/codehunt/yxiaolv/CharArrayAndString.java
@@ -0,0 +1,93 @@
+package com.codehunt.yxiaolv;
+
+import java.lang.Integer;
+
+public class CharArrayAndString {
+
+	/**
+	 * @param args
+	 */
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		
+		String strTemp = Program.Puzzle("Test");
+		System.out.println("cString=" + strTemp);
+		
+		StringBuffer strBuf = new StringBuffer();
+		strBuf.append('b');
+		
+		String strFromAscII = Program2.asciiToString("97,98,99,100,101,103");
+		System.out.println("strFromAscII="+strFromAscII);
+
+		String strToAscII = Program2.stringToAscii("abcdeg");
+		System.out.println("strToAscII="+strToAscII);
+		
+		String strPuzzle = Program2.Puzzle("aabb");
+		System.out.println("strPuzzle=" + strPuzzle);
+
+
+	}
+	
+	Integer a = new Integer(0);
+	
+	
+	private static class Program {
+	    public static String Puzzle(String s) {
+	        int m = 0;
+	        char[] c = new char[s.length()];
+			
+			for(int i=0;i<s.length();i++)
+			{
+				c[i]='f';
+				System.out.println("c["+i+"]=" + c[i]);
+			}
+			
+			System.out.println("cString=" + new String(c));
+	        return new String(c); //assign OK; c.toString will get pointer address
+	    }
+	}
+	
+	public static class Program2 {
+	    public static String Puzzle(String s) {
+	        StringBuffer strBuf = new StringBuffer();
+	        char[] c = s.toCharArray();
+
+
+	        for(int i=0;i<s.length();i++)
+			{
+				if(c[i]<='e')
+				strBuf.append((char)((int)(c[i])+5));
+			}		        
+	        return strBuf.toString();
+	    }
+	    
+		public static String asciiToString(String value)
+		{
+			StringBuffer sbu = new StringBuffer();
+			String[] chars = value.split(",");
+			for (int i = 0; i < chars.length; i++) {
+				sbu.append((char) Integer.parseInt(chars[i]));
+			}
+			return sbu.toString();
+		}
+		
+		public static String stringToAscii(String value)
+		{
+			StringBuffer sbu = new StringBuffer();
+			char[] chars = value.toCharArray(); 
+			for (int i = 0; i < chars.length; i++) {
+				if(i != chars.length - 1)
+				{
+					sbu.append((int)chars[i]).append(",");
+				}
+				else {
+					sbu.append((int)chars[i]);
+				}
+			}
+			return sbu.toString();
+		}
+	}
+	
+
+
+}
diff --git a/testJava/src/com/codehunt/yxiaolv/LoopTest.java b/testJava/src/com/codehunt/yxiaolv/LoopTest.java
new file mode 100644
index 0000000..7cbfc22
--- /dev/null
+++ b/testJava/src/com/codehunt/yxiaolv/LoopTest.java
@@ -0,0 +1,47 @@
+/**
+ * 
+ */
+package com.codehunt.yxiaolv;
+
+import java.util.List;
+import java.util.ArrayList;
+
+
+/**
+ * @author Administrator
+ *
+ */
+public class LoopTest {
+
+	/**
+	 * @param args
+	 */
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		
+		int n = 5;
+		int a[] = Puzzle(n); 
+		for(int i=0; i<n; i++)
+			System.out.println("["+i+"]="+a[i]);
+
+	}
+
+	
+    public static int[] Puzzle(int n) {
+        List<Integer> listA = new ArrayList<Integer>();
+		for(int i=0;i<n;)
+		{
+			listA.add(i);
+			i++;
+		}
+		
+		int[] aRet = new int[listA.size()];
+		for(int i=0;i<n;)
+		{
+			aRet[i] = listA.get(i);
+			i++;
+		}		
+				
+		return aRet;
+    }
+}
diff --git a/testJava/src/com/codehunt/yxiaolv/RecursePower.java b/testJava/src/com/codehunt/yxiaolv/RecursePower.java
new file mode 100644
index 0000000..f98d7f5
--- /dev/null
+++ b/testJava/src/com/codehunt/yxiaolv/RecursePower.java
@@ -0,0 +1,43 @@
+package com.codehunt.yxiaolv;
+
+public class RecursePower {
+
+	/**
+	 * @param args
+	 */
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		
+		int number=2, power=9;
+		
+		Puzzle(number, power);
+		
+		String str;
+		
+
+	}
+
+    static int nRet = 1;
+    
+    public static int Puzzle(int number, int power) {
+    	
+
+		 System.out.println("power="+power + " nRet="+nRet); //here print nRet=1 ???
+		 
+		 
+		 if(1== power)
+		 {
+			 nRet = nRet*number;
+		 }
+		
+         if((power--)>1)
+		 {
+        	 System.out.println("_power="+power + " nRet="+nRet); //here print nRet=1 ???
+        	 nRet = nRet*number * Puzzle(number,power);
+		 }
+
+		 System.out.println("__power="+power + " nRet="+nRet); //here the value is right; 
+		 return nRet;	
+    }
+
+}
diff --git a/testJava/src/com/codehunt/yxiaolv/String611.java b/testJava/src/com/codehunt/yxiaolv/String611.java
new file mode 100644
index 0000000..9f12e59
--- /dev/null
+++ b/testJava/src/com/codehunt/yxiaolv/String611.java
@@ -0,0 +1,27 @@
+package com.codehunt.yxiaolv;
+
+public class String611 {
+
+	/**
+	 * @param args
+	 */
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		Program.Puzzle(0, 2, null);
+
+	}
+	
+
+	public static class Program {
+	    public static String Puzzle(int i, int j, String s) {
+//	        StringBuffer sbTmp = new StringBuffer();
+	        char [] charArr = {(char) (i+97),(char) (j+97)};
+//			sbTmp.append((i+97));
+//			sbTmp.append((j+97));
+	        System.out.println("strout="+new String(charArr));
+			return new String(charArr); //ÕâÖÖcodehunt»á±¨´í£»
+			
+	    }
+	}  
+
+}
diff --git a/testJava/src/com/codehunt/yxiaolv/StringBufferCharArray.java b/testJava/src/com/codehunt/yxiaolv/StringBufferCharArray.java
new file mode 100644
index 0000000..35c97e7
--- /dev/null
+++ b/testJava/src/com/codehunt/yxiaolv/StringBufferCharArray.java
@@ -0,0 +1,40 @@
+package com.codehunt.yxiaolv;
+
+public class StringBufferCharArray {
+
+	/**
+	 * @param args
+	 */
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+
+		
+		String s = "Test Test9998";
+		StringBuffer strBuf = new StringBuffer(s);
+		for(int i=0; i< strBuf.length();i++)
+		{
+			if(strBuf.charAt(i) != (char)0x20)
+				strBuf.setCharAt(i, Character.toUpperCase(strBuf.charAt(i)));
+				
+		}
+		System.out.println("str="+strBuf.toString());
+		
+		
+		System.out.println("endthree="+ s.substring(s.length()-3));
+		
+		System.out.println("endthree2="+ Program.Puzzle(s));
+		
+		
+	}
+	
+	
+    public static class Program {
+        public static String Puzzle(String s) {
+             if(s.length()>=3)
+                      return (String) s.subSequence(s.length()-3, s.length());
+    	     else return s;
+        }
+    }
+
+
+}