请大神帮我这段程序每句都注释一下

Question

public String[] getSentences(){  ArrayList<String> set=new ArrayList<String>();   int length=input.getText().length(); for(int i=0,last=0;i<length;i++){   String s=String.valueOf(input.getText().charAt(i));    if(s.equals("\n"))   last=i+1;    if(s.equals(".")||s.equals(",")||s.equals("。")||s.equals("。")||s.equals("！")||s.equals("？")||s.equals("?")||s.equals("!")||s.equals("，")){    set.add(input.getText().substring(last,i)+s);   last=i+1;   }  }   return set.<String>toArray(new String[set.size()]);  }  public String getKeySentences(String[] key,String[] sentences){  String result=""; A:  for(int i=0;i<sentences.length;i++){    for (int k = 0; k < key.length; k++)   if (sentences[i].contains(key[k].subSequence(0, key[k].length()))) {  result += sentences[i] + "\n";     continue A;     }  }  return result;  }