软件工程-第二次作业
Posted 李鹏霖
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问题导读：
1. 环境搭建
2. 最大子数组和算法
3. 测试表格
解决方案：
操作系统
环境搭建
1. 下载安装包
2. 安装配置JDK
- 解压
1 tar -xvzf jdk-8u101-linux-x64.tar.gz
- 配置
1 sudo vi /etc/profile
- profile
1 # /etc/profile: system-wide .profile file for the Bourne shell (sh(2)) 2 # and Bourne compatible shells (bash(1), ksh(1), ash(1), ...). 3 4 if [ "$PS1" ]; then 5 if [ "$BASH" ] && [ "$BASH" != "/bin/sh" ]; then 6 # The file bash.bashrc already sets the default PS1. 7 # PS1=\'\\h:\\w\\$ \' 8 if [ -f /etc/bash.bashrc ]; then 9 . /etc/bash.bashrc 10 fi 11 else 12 if [ "`id -u`" -eq 0 ]; then 13 PS1=\'# \' 14 else 15 PS1=\'$ \' 16 fi 17 fi 18 fi 19 20 # The default umask is now handled by pam_umask. 21 # See pam_umask(8) and /etc/login.defs. 22 23 if [ -d /etc/profile.d ]; then 24 for i in /etc/profile.d/*.sh; do 25 if [ -r $i ]; then 26 . $i 27 fi 28 done 29 unset i 30 fi 31 export JAVA_HOME=/home/jiali/jdk1.8.0_101 32 export PATH=$JAVA_HOME/bin:$PATH 33 export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar 34 ~
- 测试
1 jiali@peerslee-521:~$ source /etc/profile 2 jiali@peerslee-521:~$ java 3 Usage: java [-options] class [args...] 4 (to execute a class) 5 or java [-options] -jar jarfile [args...] 6 (to execute a jar file) 7 where options include: 8 -d32 use a 32-bit data model if available 9 -d64 use a 64-bit data model if available 10 -server to select the "server" VM 11 The default VM is server, 12 because you are running on a server-class machine. 13 14 15 -cp <class search path of directories and zip/jar files> 16 -classpath <class search path of directories and zip/jar files> 17 A : separated list of directories, JAR archives, 18 and ZIP archives to search for class files. 19 -D<name>=<value> 20 set a system property 21 -verbose:[class|gc|jni] 22 enable verbose output 23 -version print product version and exit 24 -version:<value> 25 Warning: this feature is deprecated and will be removed 26 in a future release. 27 require the specified version to run 28 -showversion print product version and continue 29 -jre-restrict-search | -no-jre-restrict-search 30 Warning: this feature is deprecated and will be removed 31 in a future release. 32 include/exclude user private JREs in the version search 33 -? -help print this help message 34 -X print help on non-standard options 35 -ea[:<packagename>...|:<classname>] 36 -enableassertions[:<packagename>...|:<classname>] 37 enable assertions with specified granularity 38 -da[:<packagename>...|:<classname>] 39 -disableassertions[:<packagename>...|:<classname>] 40 disable assertions with specified granularity 41 -esa | -enablesystemassertions 42 enable system assertions 43 -dsa | -disablesystemassertions 44 disable system assertions 45 -agentlib:<libname>[=<options>] 46 load native agent library <libname>, e.g. -agentlib:hprof 47 see also, -agentlib:jdwp=help and -agentlib:hprof=help 48 -agentpath:<pathname>[=<options>] 49 load native agent library by full pathname 50 -javaagent:<jarpath>[=<options>] 51 load Java programming language agent, see java.lang.instrument 52 -splash:<imagepath> 53 show splash screen with specified image 54 See http://www.oracle.com/technetwork/java/javase/documentation/index.html for more details. 55 jiali@peerslee-521:~$ javac 56 Usage: javac <options> <source files> 57 where possible options include: 58 -g Generate all debugging info 59 -g:none Generate no debugging info 60 -g:{lines,vars,source} Generate only some debugging info 61 -nowarn Generate no warnings 62 -verbose Output messages about what the compiler is doing 63 -deprecation Output source locations where deprecated APIs are used 64 -classpath <path> Specify where to find user class files and annotation processors 65 -cp <path> Specify where to find user class files and annotation processors 66 -sourcepath <path> Specify where to find input source files 67 -bootclasspath <path> Override location of bootstrap class files 68 -extdirs <dirs> Override location of installed extensions 69 -endorseddirs <dirs> Override location of endorsed standards path 70 -proc:{none,only} Control whether annotation processing and/or compilation is done. 71 -processor <class1>[,<class2>,<class3>...] Names of the annotation processors to run; bypasses default discovery process 72 -processorpath <path> Specify where to find annotation processors 73 -parameters Generate metadata for reflection on method parameters 74 -d <directory> Specify where to place generated class files 75 -s <directory> Specify where to place generated source files 76 -h <directory> Specify where to place generated native header files 77 -implicit:{none,class} Specify whether or not to generate class files for implicitly referenced files 78 -encoding <encoding> Specify character encoding used by source files 79 -source <release> Provide source compatibility with specified release 80 -target <release> Generate class files for specific VM version 81 -profile <profile> Check that API used is available in the specified profile 82 -version Version information 83 -help Print a synopsis of standard options 84 -Akey[=value] Options to pass to annotation processors 85 -X Print a synopsis of nonstandard options 86 -J<flag> Pass <flag> directly to the runtime system 87 -Werror Terminate compilation if warnings occur 88 @<filename> Read options and filenames from file 89 94 jiali@peerslee-521:~$ java -version 95 java version "1.8.0_101" 96 Java(TM) SE Runtime Environment (build 1.8.0_101-b13) 97 Java HotSpot(TM) 64-Bit Server VM (build 25.101-b13, mixed mode)
3. 安装eclipse neon
1 tar -xvf eclipse-jee-neon-1-linux-gtk-x86_64.tar.gz
最大子数组和算法实现
1 package p01; 2 public class MaxSubArraySum { 3 public static void main(String []args) { 4 /* 5 * 测试数组 6 */ 7 int []arr1 = {1, 1, 1, 1, 1, 1}; 8 int []arr2 = {0, 0, 0, 0, 0, 0}; 9 int []arr3 = {-9, -2, -3, -5, -3}; 10 int []arr4 = {1, -2, 3, 5, -3, 2}; 11 int []arr5 = {0, -2, 3, 5, -1, 2}; 12 13 /* 14 * 测试结果 15 */ 16 System.out.println( 17 "+：\\t" + maxSum(arr1) + "\\n" + 18 "0：\\t" + maxSum(arr2) + "\\n" + 19 "-：\\t" + maxSum(arr3) + "\\n" + 20 "+-：\\t" + maxSum(arr4) + "\\n" + 21 "+0-：\\t" + maxSum(arr5) 22 ); 23 24 } 25 26 static int maxSum(int []arr) { 27 int nStart = arr[0]; 28 int nAll = arr[0]; 29 30 /* 31 * 动态规划： 32 * max{arr[i],arr[i]+start[i+1],all[i]} 33 * 注： 34 * arr[i] -> 第 i 个数值 35 * arr[i] + start[i+1] -> 第 i 个 数值 加上 下一个数值 36 * all[i] -> 当前最大子数组和 37 */ 38 for(int i = 1; i < arr.length; i++) { 39 nStart = Math.max(arr[i], arr[i]+nStart); 40 nAll = Math.max(nStart, nAll); 41 } 42 return nAll; 43 } 44 }
代码托管：coding.net
测试表格
|
|
用例描述 | 输入数据 | 预期输出数据 | 实际输出数据 | 通过/不通过 |
|
| 1 | 正数 | 1, 1, 1, 1, 1, 1 | 6 | 6 | 通过 | 正常 |
| 2 | 0 | 0, 0, 0, 0, 0, 0 | 0 | 0 | 通过 |
正常 |
| 3 | 负数 | -9, -2, -3, -5, -3 | -2 | -2 | 通过 |
正常 |
| 4 | 正数 和 负数 | 1, -2, 3, 5, -3, 2 | 8 | 8 | 通过 |
正常 |
| 5 | 正数、0 和 负数 | 0, -2, 3, 5, -1, 2 | 9 | 9 | 通过 |
正常 |
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