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新增java 2-D array 建議

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Original file line number	Diff line number	Diff line change
`@@ -144,6 +144,11 @@ Java:`
`144`	`144`	`*/`
`145`	`145`	`class Solution {`
`146`	`146`	`public int longestCommonSubsequence(String text1, String text2) {`
	`147`	`+ // char[] char1 = text1.toCharArray();`
	`148`	`+ // char[] char2 = text2.toCharArray();`
	`149`	`+ // 可以在一開始的時候就先把text1, text2 轉成char[],之後就不需要有這麼多爲了處理字串的調整`
	`150`	`+ // 就可以和卡哥的code更一致`
	`151`	`+`
`147`	`152`	`int[][] dp = new int[text1.length() + 1][text2.length() + 1]; // 先对dp数组做初始化操作`
`148`	`153`	`for (int i = 1 ; i <= text1.length() ; i++) {`
`149`	`154`	`char char1 = text1.charAt(i - 1);`

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