h.append(s.charAt(i))什么意思
3个回答
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append添加，追加的意思 charAt是获取s的第i个字符
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在字符串h后面追加一个字符
这个字符是字符串s的第（i+1)个字符
这个字符是字符串s的第（i+1)个字符
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在h后面加上s.charAt(i)
多查api
http://docs.oracle.com/javase/7/docs/api/
append
public StringBuffer append(String str)
Appends the specified string to this character sequence.
The characters of the String argument are appended, in order, increasing the length of this sequence by the length of the argument. If str is null, then the four characters "null" are appended.
Let n be the length of this character sequence just prior to execution of the append method. Then the character at index k in the new character sequence is equal to the character at index k in the old character sequence, if k is less than n; otherwise, it is equal to the character at index k-n in the argument str.
Parameters:
str - a string.
Returns:
a reference to this object.
多查api
http://docs.oracle.com/javase/7/docs/api/
append
public StringBuffer append(String str)
Appends the specified string to this character sequence.
The characters of the String argument are appended, in order, increasing the length of this sequence by the length of the argument. If str is null, then the four characters "null" are appended.
Let n be the length of this character sequence just prior to execution of the append method. Then the character at index k in the new character sequence is equal to the character at index k in the old character sequence, if k is less than n; otherwise, it is equal to the character at index k-n in the argument str.
Parameters:
str - a string.
Returns:
a reference to this object.
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