第二次作业

group07/1058267830/week2/.classpath

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+<?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/jdk1.7.0_80"/>
+	<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>

group07/1058267830/week2/.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>week2</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>

group07/1058267830/week2/.settings/org.eclipse.jdt.core.prefs

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+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.7
+org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
+org.eclipse.jdt.core.compiler.compliance=1.7
+org.eclipse.jdt.core.compiler.debug.lineNumber=generate
+org.eclipse.jdt.core.compiler.debug.localVariable=generate
+org.eclipse.jdt.core.compiler.debug.sourceFile=generate
+org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
+org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
+org.eclipse.jdt.core.compiler.source=1.7

group07/1058267830/week2/bin/com/coderising/litestruts/struts.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<struts>
+    <action name="login" class="com.coderising.litestruts.LoginAction">
+        <result name="success">/jsp/homepage.jsp</result>
+        <result name="fail">/jsp/showLogin.jsp</result>
+    </action>
+    <action name="logout" class="com.coderising.litestruts.LogoutAction">
+    	<result name="success">/jsp/welcome.jsp</result>
+    	<result name="error">/jsp/error.jsp</result>
+    </action>
+</struts>

group07/1058267830/week2/src/com/coderising/array/ArrayTest.java

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+package com.coderising.array;
+
+import static org.junit.Assert.*;
+
+import org.junit.Test;
+
+public class ArrayTest {
+	ArrayUtil util = new ArrayUtil();
+
+	@Test
+	public void testReverseArray() {
+		int[] origin = {1,2,3,4,53,52,4,2,423};
+		int[] target = util.reverseArray(origin);
+		int[] expecteds = {423, 2, 4, 52, 53, 4, 3, 2, 1};
+		assertArrayEquals(expecteds, target);
+	}
+
+	@Test
+	public void testRemoveZero(){
+		int[] oldArray = {1,3,4,5,0,0,6,6,0,5,4,7,6,7,0,5};
+		int[] target = util.removeZero(oldArray);
+		int[] expecteds = {1, 3, 4, 5, 6, 6, 5, 4, 7, 6, 7, 5 };
+		assertArrayEquals(expecteds, target);
+	}
+
+	@Test
+	public void testMerger(){
+		int[] a1 = {3, 5, 7,8};
+		int[] a2 = {4, 5, 6,7};
+		int[] target = util.merge(a1, a2);
+		int[] expecteds = {3, 4, 5, 6, 7, 8 };
+		assertArrayEquals(expecteds, target);
+	}
+
+	@Test
+	public void testGrow(){
+		int[] oldArray = {3, 5,7,8};
+		int[] target = util.grow(oldArray, 4);
+		int[] expecteds = {3, 5,7,8, 0, 0, 0,0 };
+		assertArrayEquals(expecteds, target);
+	}
+
+	@Test
+	public void testFibonacci(){
+		int[] target = util.fibonacci(15);
+
+		//int[] expecteds = {1,1};
+		int[] expecteds = {1, 1, 2, 3, 5, 8, 13 };
+		assertArrayEquals(expecteds, target);
+	}
+
+	@Test
+	public void testGetPrimes(){
+		int[] target = util.getPrimes(25);
+		int[] expecteds = {2, 3, 5, 7, 11, 13, 17, 19, 23 };
+		assertArrayEquals(expecteds, target);
+//		for(int i=0; i<target.length; i++)
+//			System.out.print(target[i] + " ");
+	}
+
+	@Test
+	public void testGetPerfectNumbers(){
+		int[] target = util.getPerfectNumbers(3000);
+		int[] expecteds = {6, 28, 496 };
+		assertArrayEquals(expecteds, target);
+//		for(int i=0; i<target.length; i++)
+//			System.out.print(target[i] + " ");
+	}
+
+	@Test
+	public void testJoin(){
+		int[] array = {1,2,3};
+		String target = util.join(array, "-");
+		String expecteds = "1-2-3";
+		assertEquals(expecteds, target);
+	}
+}

group07/1058267830/week2/src/com/coderising/array/ArrayUtil.java

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+package com.coderising.array;
+
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Set;
+
+public class ArrayUtil {
+
+	/**
+	 * 给定一个整形数组a , 对该数组的值进行置换
+		例如： a = [7, 9 , 30, 3]  ,   置换后为 [3, 30, 9,7]
+		如果     a = [7, 9, 30, 3, 4] , 置换后为 [4,3, 30 , 9,7]
+	 * @param origin
+	 * @return
+	 */
+	public int[] reverseArray(int[] origin){
+		if(origin == null)
+			return null;
+		int length = origin.length;
+		int[] target = new int[length];
+		for(int i=0; i<length ;i++){
+			target[length-1-i] = origin[i];
+		}
+		return target;
+	}
+
+	/**
+	 * 现在有如下的一个数组：   int oldArr[]={1,3,4,5,0,0,6,6,0,5,4,7,6,7,0,5}   
+	 * 要求将以上数组中值为0的项去掉，将不为0的值存入一个新的数组，生成的新数组为：   
+	 * {1,3,4,5,6,6,5,4,7,6,7,5}  
+	 * @param oldArray
+	 * @return
+	 */
+
+	public int[] removeZero(int[] oldArray){
+		if(oldArray == null)
+			return null;
+		int zeroNum = 0;
+		int length = oldArray.length;
+		for(int i=0; i<length; i++){
+			if(oldArray[i] == 0)
+				zeroNum++;
+		}
+		int[] newArray = new int[length - zeroNum];
+		int j = 0;
+		for(int i=0; i<length; i++){
+			if(oldArray[i] != 0)
+				newArray[j++] = oldArray[i];
+		}
+		return newArray;
+	}
+
+	/**
+	 * 给定两个已经排序好的整形数组， a1和a2 ,  创建一个新的数组a3, 使得a3 包含a1和a2 的所有元素， 并且仍然是有序的
+	 * 例如 a1 = [3, 5, 7,8]   a2 = [4, 5, 6,7]    则 a3 为[3,4,5,6,7,8]    , 注意： 已经消除了重复
+	 * @param array1
+	 * @param array2
+	 * @return
+	 */
+
+	public int[] merge(int[] array1, int[] array2){
+		if(array1 == null || array2 == null)
+			return array1 == null ? array2 : array1;
+		Set<Integer> set = new HashSet<Integer>();
+		for(int i=0; i<array1.length; i++){
+			set.add(array1[i]);
+		}
+		for(int i=0; i<array2.length; i++){
+			set.add(array2[i]);
+		}
+		int[] target = new int[set.size()];
+		int i = 0;
+		Iterator<Integer> it = set.iterator();
+		while(it.hasNext()){
+			target[i++] = it.next();
+		}
+		return target;
+	}
+	/**
+	 * 把一个已经存满数据的数组 oldArray的容量进行扩展， 扩展后的新数据大小为oldArray.length + size
+	 * 注意，老数组的元素在新数组中需要保持
+	 * 例如 oldArray = [2,3,6] , size = 3,则返回的新数组为
+	 * [2,3,6,0,0,0]
+	 * @param oldArray
+	 * @param size
+	 * @return
+	 */
+	public int[] grow(int [] oldArray,  int size){
+		if(oldArray == null)
+			return null;
+		if(size == 0)
+			return oldArray;
+		if(size < 0)
+			throw new RuntimeException("参数错误");
+		int length = oldArray.length + size;
+		int[] target = new int[length];
+		System.arraycopy(oldArray, 0, target, 0, oldArray.length);
+		for(int i=oldArray.length; i< length; i++){
+			target[i] = 0;
+		}
+		return target;
+	}
+
+	/**
+	 * 斐波那契数列为：1，1，2，3，5，8，13，21......  ，给定一个最大值， 返回小于该值的数列
+	 * 例如， max = 15 , 则返回的数组应该为 [1，1，2，3，5，8，13]
+	 * max = 1, 则返回空数组 []
+	 * @param max
+	 * @return
+	 */
+	public int[] fibonacci(int max){
+		if(max < 1)
+			throw new RuntimeException("参数错误");
+		if(max == 1){
+			int[] result = {};
+			return result;
+		}
+		if(max == 2){
+			int[] result = {1, 1};
+			return result;
+		}
+		List<Integer> list = new ArrayList<Integer>();
+		list.add(1);
+		list.add(1);
+		for(int i=2; ; i++){
+			int tmp = list.get(i-2) + list.get(i-1);
+			if(tmp < max){
+				list.add(tmp);
+			}else{
+				break;
+			}
+		}
+		int size = list.size();
+		int[] result = new int[size];
+		for(int i=0; i<size; i++)
+			result[i] = list.get(i);
+		return result;
+	}
+
+	/**
+	 * 返回小于给定最大值max的所有素数数组
+	 * 例如max = 23, 返回的数组为[2,3,5,7,11,13,17,19]
+	 * @param max
+	 * @return
+	 */
+	public int[] getPrimes(int max){
+		if(max <= 0)
+			throw new RuntimeException("参数错误");
+		if(max <=2 ){
+			int[] result = {};
+			return result;
+		}
+
+		if(max <= 13){
+			int[] tmp = {2,3,5,7,11,13};
+			int index = 0;
+			for(int i=0; i<6; i++){
+				index = i;
+				if(tmp[i] >= max)
+					break;
+			}
+			int[] result = new int[index];
+			System.arraycopy(tmp, 0, result, 0, index);
+			return result;
+		}
+
+		List<Integer> list = new ArrayList<Integer>();
+		list.add(2);
+		list.add(3);
+		list.add(5);
+		list.add(7);
+		list.add(11);
+		for(int i=13; i<max; i+=2){
+			boolean isNum = true;
+			for(int j=3; j<=Math.sqrt(i); j++){
+				if(i%j == 0){
+					isNum = false;
+					break;
+				}
+			}
+			if(isNum == true)
+				list.add(i);
+		}
+		int[] result = new int[list.size()];
+		for(int i=0; i<list.size(); i++)
+			result[i] = list.get(i);
+		return result;
+	}
+
+	/**
+	 * 所谓“完数”， 是指这个数恰好等于它的因子之和，例如6=1+2+3
+	 * 给定一个最大值max， 返回一个数组， 数组中是小于max 的所有完数
+	 * @param max
+	 * @return	
+	 */
+	public int[] getPerfectNumbers(int max){  
+		if(max <= 1)
+			throw new RuntimeException("参数错误");
+		if(max <= 5){
+			int[] result = {};
+			return result;
+		}
+		List<Integer> list = new ArrayList<Integer>();
+		for(int input = 2; input<max; input++){
+			int sum = 1;
+			for(int i=2; i<=input/2.0; i++){
+				if(input % i == 0){
+					sum += i;
+				}
+			}
+			if(sum == input)
+				list.add(input);
+		}
+		int[] result = new int[list.size()];
+		for(int i=0; i<list.size(); i++)
+			result[i] = list.get(i);
+		return result;
+	}
+
+	/**
+	 * 用seperator 把数组 array给连接起来
+	 * 例如array= [3,8,9], seperator = "-"
+	 * 则返回值为"3-8-9"
+	 * @param array
+	 * @param s
+	 * @return
+	 */
+	public String join(int[] array, String seperator){
+		String s = "";
+		for(int i=0; i<array.length-1; i++){
+			s = s + (array[i]) + "-"; 
+		}
+		s = s + array[array.length-1];
+		return s;
+	}
+
+
+}