Commit 99dc852

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更新了剑指Offer05.替换空格的java双指针解法

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Original file line number	Diff line number	Diff line change
`@@ -144,6 +144,41 @@ public static String replaceSpace(StringBuffer str) {`
`144`	`144`	`}`
`145`	`145`	`return sb.toString();`
`146`	`146`	`}`
	`147`	`+`
	`148`	`+//方式二:双指针法`
	`149`	`+public String replaceSpace(String s) {`
	`150`	`+ if(s == null \|\| s.length() == 0){`
	`151`	`+ return s;`
	`152`	`+ }`
	`153`	`+ //扩充空间,空格数量2倍`
	`154`	`+ StringBuilder str = new StringBuilder();`
	`155`	`+ for (int i = 0; i < s.length(); i++) {`
	`156`	`+ if(s.charAt(i) == ' '){`
	`157`	`+ str.append(" ");`
	`158`	`+ }`
	`159`	`+ }`
	`160`	`+ //若是没有空格直接返回`
	`161`	`+ if(str.length() == 0){`
	`162`	`+ return s;`
	`163`	`+ }`
	`164`	`+ //有空格情况定义两个指针`
	`165`	`+ int left = s.length() - 1;//左指针:指向原始字符串最后一个位置`
	`166`	`+ s += str.toString();`
	`167`	`+ int right = s.length()-1;//右指针:指向扩展字符串的最后一个位置`
	`168`	`+ char[] chars = s.toCharArray();`
	`169`	`+ while(left>=0){`
	`170`	`+ if(chars[left] == ' '){`
	`171`	`+ chars[right--] = '0';`
	`172`	`+ chars[right--] = '2';`
	`173`	`+ chars[right] = '%';`
	`174`	`+ }else{`
	`175`	`+ chars[right] = chars[left];`
	`176`	`+ }`
	`177`	`+ left--;`
	`178`	`+ right--;`
	`179`	`+ }`
	`180`	`+ return new String(chars);`
	`181`	`+}`
`147`	`182`	```
`148`	`183`
`149`	`184`

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