Skip to content

Commit

Permalink
Merge pull request #24 from PG123GG/master
Browse files Browse the repository at this point in the history
Master
  • Loading branch information
wizardzhang2017 authored Mar 19, 2017
2 parents ee87eea + d2402c3 commit 8e9cb23
Show file tree
Hide file tree
Showing 14 changed files with 638 additions and 0 deletions.
2 changes: 2 additions & 0 deletions group27/1067041567/TestColleaction/.classpath
Original file line number Diff line number Diff line change
Expand Up @@ -2,5 +2,7 @@
<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>
Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
eclipse.preferences.version=1
encoding/<project>=UTF-8
Original file line number Diff line number Diff line change
@@ -1,5 +1,6 @@
eclipse.preferences.version=1
org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
org.eclipse.jdt.core.compiler.codegen.methodParameters=do not generate
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
Expand Down
12 changes: 12 additions & 0 deletions group27/1067041567/TestColleaction/RemoteSystemsTempFiles/.project
Original file line number Diff line number Diff line change
@@ -0,0 +1,12 @@
<?xml version="1.0" encoding="UTF-8"?>
<projectDescription>
<name>RemoteSystemsTempFiles</name>
<comment></comment>
<projects>
</projects>
<buildSpec>
</buildSpec>
<natures>
<nature>org.eclipse.rse.ui.remoteSystemsTempNature</nature>
</natures>
</projectDescription>
290 changes: 290 additions & 0 deletions group27/1067041567/TestColleaction/src/cn/task2/ArrayUtil.java
Original file line number Diff line number Diff line change
@@ -0,0 +1,290 @@
package cn.task2;

import org.junit.Test;

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 void reverseArray(int[] origin){
enSure(origin);
int len = origin.length-1;
for(int k=0;k<origin.length/2;k++){
int temp = origin[k];
origin[k] = origin[len-k];
origin[len-k] = temp;
}

/* 该方法不会改变实参
* int[] temp = new int[origin.length];
int len = origin.length-1;
for(int k=0;k<origin.length;k++){
temp[len-k] = origin[k];
}
origin = temp;
System.out.println("转换后origin:1-->"+origin);
*/
}

/**
* 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){
enSure(oldArray);
int len = 0;
for(int i=0;i<oldArray.length;i++){
if(oldArray[i]!=0){
len++;
}
}
if(len==0){
try {
throw new Exception("转换的数组不为空,但有且只有一个为0的元素!");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
int[] temp = new int[len];
int k = 0;
for(int i=0;i<oldArray.length;i++){
if(oldArray[i]!=0){
temp[k++] = oldArray[i];
}
}
return temp;
}

/**
* 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){
enSure(array1);
enSure(array2);
int[] temp = new int[array1.length+array2.length];
System.arraycopy(array1, 0, temp, 0, array1.length);
System.arraycopy(array2, 0, temp, array1.length, array2.length);
//冒泡排序
for(int i=0;i<temp.length-1;i++){
for(int j=0;j<temp.length-i-1;j++){
if(temp[j] > temp[j+1]){
int arr = temp[j];
temp[j] = temp[j+1];
temp[j+1] = arr;
}
}
}
for(int i=0;i<temp.length;i++){
System.out.print("temp["+i+"] = "+temp[i]+" ");
}
System.out.println();
//查找不重复元素的个数
int len = 0;
for(int i=0;i<temp.length-1;i++){
if(temp[i] != temp[i+1]){
len++;
continue;
}
}
if(temp[temp.length-2] != temp[temp.length-1])
len++;

//赋值给新的元素
int[] temp2 = new int[len];
int k = 0;
for(int i=0;i<temp.length-1;i++){
if(temp[i] != temp[i+1]){
temp2[k++] = temp[i];
}
}
if(temp[temp.length-2] != temp[temp.length-1])
temp2[temp2.length-1] = temp[temp.length-1];
/* for(int i=0;i<temp2.length;i++){
System.out.print("temp2["+i+"] = "+temp2[i]+" ");
}*/

return temp2;
}
/**
* 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){
int len = oldArray.length+size;
int[] temp = new int[len];
System.arraycopy(oldArray, 0, temp, 0, oldArray.length);
for(int i=0;i<len;i++){
System.out.println("new["+i+"] = "+temp[i]);
}
return temp;
}

/**
* 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){
try {
throw new Exception("max小于1,找不出合适的数组!");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if(max == 1){
return null;
}
int k = 0;
for(int i=1;i<max;i++){
if(count(i)<max){
k++;
}else{
break;
}
}
int[] temp = new int[k];
for(int i=0;i<k;i++){
temp[i] = count(i+1);
}
return temp;
}

public int count(int num){
if(num <= 0){
try {
throw new Exception("num不可以小于0!");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if(num ==1 || num ==2){
return 1;
}else{
return count(num-1)+count(num-2);
}
}

/**
* 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){
boolean isprime = true;
int len = 0;

for(int i=2;i<max;i++){
for(int j=2;j<i;j++){
if(i%j == 0){
isprime = false;
break;
}
}
if(isprime){
len++;
}
isprime = true;
}

int[] temp = new int[len];
int k = 0 ;
for(int i=2;i<max;i++){
for(int j=2;j<i;j++){
if(i%j == 0){
isprime = false;
break;
}
}
if(isprime){
temp[k++] = i;
}
isprime = true;
}
return temp;
}

/**
* 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){
int k = 0;
for(int i=1;i<=max;i++){
int sum=0;
for (int j = 1; j < i; j++){
if(i%j==0){
sum+=j;
}
}
if(i==sum){
k++;
}
}

int[] arr = new int[k];
int len = 0;
for(int i=1;i<=max;i++){
int sum=0;
for (int j = 1; j < i; j++){
if(i%j==0){
sum+=j;
}
}
if(i==sum){
arr[len++] = i;
}
}
return arr;
}

/**
* 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){
StringBuffer sb = new StringBuffer();
for(int i=0;i<array.length-1;i++){
sb.append(array[i]+""+seperator);
}
sb.append(array[array.length-1]);
return sb.toString();
}

public void enSure(int[] arr){
if(arr==null){
throw new NullPointerException("该数组为空!");
}
}
}
43 changes: 43 additions & 0 deletions group27/1067041567/TestColleaction/src/cn/task2/ArrayUtilTest.java
Original file line number Diff line number Diff line change
@@ -0,0 +1,43 @@
package cn.task2;

public class ArrayUtilTest {

public static void main(String[] args) {

ArrayUtil au = new ArrayUtil();
/*
int[] a = {1,5,47,9,3,4,};
System.out.println("转换前a:2-->"+a);
for(int i=0;i<a.length;i++){
System.out.print("a["+i+"] = "+a[i]+" ");
}
System.out.println("----------");
au.reverseArray(a);
System.out.println("转换后a:2-->"+a);
System.out.println();
for(int i=0;i<a.length;i++){
System.out.print("a["+i+"] = "+a[i]+" ");
}*/

/* int[] a = {0};
int[] b =au.removeZero(a);
for(int i=0;i<b.length;i++){
System.out.println("b["+i+"] = "+b[i]);
}*/

int[] a = {1,5,47,9,3,4,};
int[] b = {3,5};

//au.grow(a, 3);

//int c[] = au.fibonacci(16);

int[] c = au.getPrimes(23);
for(int i=0;i<c.length;i++){
System.out.print("c["+i+"] = "+c[i]+" ");
}

System.out.println(au.join(a, "-"));
}
}
Loading

0 comments on commit 8e9cb23

Please sign in to comment.