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import java.util.regex.*;
import java.util.*;
public class AutoSelectString { //http://bbs.itheima.com/thread-12655-1-1.html的题目
private String poems;
private Vector<String> poemsPart;// 存放每一句
private Vector<Integer> poemsNumber;//存放随即产生的每一句空白处的索引
public AutoSelectString(String poems){
this.poems = poems;
poemsPart = new Vector<String>();
poemsNumber = new Vector<Integer>();
autoMaker();
show();
}
//使用正则表达式
public void autoMaker(){
Pattern pattern = Pattern.compile("\\S*\\s");
Matcher matcher = pattern.matcher(poems);
while(matcher.find()){
poemsPart.add(matcher.group());
}
for(int i=0;i<poemsPart.size();i++){
String str = poemsPart.get(i);
int random = new Random().nextInt(str.length()-2);
poemsNumber.add(random);
}
}
//输出
public void show(){
char[] chars = new char[poemsPart.size()];
for(int i=0;i<chars.length;i++){
chars[i] = poemsPart.get(i).charAt(poemsNumber.get(i));
System.out.print(poemsPart.get(i).replace(chars[i],'_'));
}
System.out.println("");
//下面的输出没有做到能够对于任意的诗句进行选项排列组合输出，只能只对于诗句是四言的，可以通过添加排列组合算法实现模块化输出四言，八言，词等
System.out.println("A : "+chars[0] + " " +chars[1]+ " " +chars[2]+ " " +chars[3]);
System.out.println("B : "+chars[1] + " " +chars[3]+ " " +chars[2]+ " " +chars[0]);
System.out.println("C : "+chars[2] + " " +chars[1]+ " " +chars[0]+ " " +chars[1]);
System.out.println("D : "+chars[3] + " " +chars[2]+ " " +chars[1]+ " " +chars[0]);
}
public static void main(String[] args){
//诗句格式是每一句结尾加一个空格
new AutoSelectString("床前明月光，疑是地上霜，举头望明月，低头思故乡。 ");
}
}

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