All is well

Array轉ArrayList
String[] values= {"A","B","C","D"};
ArrayList ChangeArrayList = new ArrayList(Arrays.asList(values));
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ArrayList轉Array
ArrayList ValueList = new ArrayList();ValueList.add("A");
ValueList.add("A");
String[] values = ValueList.toArray(new String[0]);
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String 轉 int
int intValue = Integer.valueOf("12345");
int intValue = Integer.parseInt("12345");
回傳NaN代表失敗
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int轉 String
String s = String.valueOf(i); 
String s = Integer.toString(i); 
String s = "" + i; 
String.valueOf() 裡面可以擺入boolean char char[] double float int Object
String.valueOf(char[] data, int offset, int count) :
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Arraylist 字串查詢
boolean isIn = myList.contains(s);  //若用上面的例子 因為有s字串 所以回傳true
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ArrayList宣告
ArrayList<String> myList = new ArrayList<String>();  //指定是String的型態
ArrayList myList = new ArrayList(); // 也可以不指定
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字串切割  StringUtil.split(obj.toString(), ",|:|{|}");  |可以連接多個判斷
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字串取範圍值 string.substring(1,3);